Prefeasibility ReportFor the proposed

2X 800 MW Super Critical

Coal Based Thermal Power Plant

atMojap village, Taluka Dwarka,

District Devbhoomi Dwarka, Gujarat

Project Proponent

Gujarat State Electricity Corporation LimitedVidyut Bhavan, Race Course, Vadodara, Gujarat – 390 007

Ph: +91 265-6612131 Fax: 91-265-2341588

E-mail: cepnp.gsecl@gebmail.com

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Contents

1. Executive Summary 3

2. Introduction of the Project/Background Information 6

3. Project Description 11

4. Site Analysis 32

5. Planning Brief 35

6. Proposed Infrastructure 37

7. Rehabilitation and Resettlement (R&R) Plan 40

8. Project Schedule & Cost Estimates 41

9. Analysis of Proposal (Final Recommendations) 42

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1. EXECUTIVE SUMMARY

INTRODUCTION

Gujarat State Electricity Corporation Limited (GSECL) has proposed to establish 2 x 800MW Supercritical Coal fired power plant at village Mojap in Dwarka Taluka of Devbhoomi Dwarka district inGujarat.

Govt. of Gujarat has allocated 175.66 Ha of govt. land and unirrigated land to GSECL to set up theabove power plant. GSECL is proposing to acquire total land of 210 Ha for main power plant incontiguous to and including the above land. In addition, GSECL is proposing to acquire about 160Ha of land for ash pond and 14 Ha of land for colony outside the main plant area at separatelocations.

The proposed site is uninhabited, non-agricultural and close to Arabian sea shore. It is about 8.0-kmaway from the Marine National Park/Sanctuary and lies outside the MoEF notified eco-sensitivezone. The plant location confirm to the CRZ notification 2012 and is located 500-mts away from theHTL. Highway connecting Jamnagar to Okha port passes close to the plot site and is located at500-m away from the national highway.

The power block shall consist of 2 x 800 MW Steam Generator (Boilers), steam turbine generatorswith all the associated auxiliary facilities. All the balance of plant facilities have been arranged in anoptimized manner considering the limited site area available. Supercritical steam cycle using opencycle sea water for condenser cooling is considered for proposed plant. Soft water requirement isproposed to be met through RO based sea water desalination due to the non-availability of softwater for the power plant use presently. Necessary provisions will be made to minimize water andair pollution from the power plant and recycling of water will be done.

It is proposed to draw consumptive water requirement from the Arabian sea and the pumpingstation for the same shall be located inside the sea at a suitable distance to be decided afterbathymetry studies are completed. An open cycle cooling of condenser is proposed due to thecloseness of sea and better cycle heat rate. Total requirement of sea water is 225,960 m3/hr on thebasis of open cycle condenser cooling system.

Ministry of Coal, Govt. Of India has allotted Machhakata and Mahanadi Coal Blocks in Talcher coalfields of Orissa to Mahaguj Collieries Ltd. under Govt. dispensation quota. It is expected thatwashed coal with a calorific value of 4200 kcal/kg and ash contents not exceeding 34% shall bemade available for this plant. Transportation of coal from the coal fields of Orissa to the proposedpower plant shall be overseas followed by rail or through a customized captive jetty. The total coalrequirement at 90% PLF is around 7.0 MTPA and coal storage will be provided for coal requirementfor 21 days based on current practice and considering long distance for coal haulage which isaround 445,766 MT.

It is proposed to collect 100% bottom ash and fly ash in dry form which is proposed to be utilizedfor industrial purposes as per MoEF guidelines. During emergency only, ash may be sent to theash dyke with a provision for storage of ash up to 15mt. level as per CEA norms.

Startup and low load fuel oil requirements shall be met from fuel oil system (LDO / HFO) comprising

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of tanks/ pumps etc.

The generated power shall be evacuated through 400 kV/765 kV line to 400 kV Bhogat substationproposed which is 50 kms away from the project site.

Space provision will be made for Limestone scrubber type Flue Gas Desulfurization (FGD) system.Make up water for this shall be drawn from the RO Plant or other sources if available.

Owing to high efficiency and lower CO2 emissions per MW generation, this Unit shall be eligible forCDM benefits.

Considering the above it is concluded that it is feasible to install 2 x 800 MW power plant at thedesignated site.

Salient Features of the Project Type of proposed project Establishment of 2X800 MW super critical Coal based Power Plant Category of Project Category AS. No. in the schedule as per EIA notification, 2006

1 (d) Thermal Power Plant

Project coordinates

Main Plant

220 23’ 16.28” N 680 58’ 19.38” E

220 23’ 12.23” N 680 58’ 48.13” E

220 21’ 56.31” N 680 58’ 28.16” E

220 21’ 56.78” N 680 58’ 3.86” E

220 22’ 02.81” N 680 57’ 46.95” E

Ask Dyke22 20’19.80”N68 58’15.06”E

22 20’04.40”N68 58’56.19”E

22 20’42.00”N68 59’14.22”E

22 20’58.91”N68 58’30.02”E

Colony22 21’15.67”N68 58’24.04”E

22 21’08.60”N68 58’20.55”E

22 21’00.69”N68 58’15.87”E

22 20’57.72”N68 58’24.12”E

22 21’04.50”N68 58’27.69”E

22 21’16.07”N68 58’33.42”E

Elevation 04– 05 m aboveMSL

Area of land210 Ha – Main Power Plant, 160 Ha – Ash Dyke14 Ha - Colony

Accessibility Nearest Railway station Okha Railway station(17 km)Air Port Jamnagar Airport (112 km)Sea Port Okha port (20 km)Nearest habitation Bhimrana (0.5 km)Nearest head quarter Jamkhambhalia (50 km)Road to the project site State Expressway - 2 lane from Rajkot to Okha, 6 lane from

Ahmedabad to Rajkot.Distance from highway State Highway (SH-6A)- 500-m Environmental Sensitivity

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Water bodies Arabian sea (0.5 Km from HTL)Forest Area None within 10 km radius study area of 10-km radiusSanctuaries / National Parks

Marine Sanctuary at 8.0 km.

Archaeological/Historically Important Site

None within 10 km radius study area of 10-km radius

Seismic zone Seismic Zone – IV as per IS: 1893-2002 , GOI

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2. INTRODUCTION OF THE PROJECT/ BACKGROUND INFORMATION

Identification of project and project proponent

Gujarat State Electricity Corporation Limited (GSECL) is planning to set up a 2 x 800MW Supercritical Coal fired power plant at village Mojap in Dwarka Taluka of Devbhoomi Dwarka district inGujarat to cater to the requirements of Gujarat and surrounding states. The Site is located at about12 km from Dwarka Town.

Project Proponent

Gujarat State Electricity Corporation Limited (GSECL) is a company promoted in 1993 by GujaratUrja Vikas Nigam Ltd (GUVNL - formally GEB) as 100% owned subsidiary of Gujarat Government.Government of Gujarat approved GSECL as a generating company to undertake implementation ofnew power projects. The present generating capacity of the company is approx. 5000 MWcomprising of coal, gas, hydro, wind and solar power generating units. Its current assets stand atINR 10,075 crore with a turnover of INR 7841 crore.

Gujarat State Electricity Corporation Limited (GSECL) is planning to set up a 2 x 800MW Supercritical Coal fired power plant at village Mojap in Dwarka Taluka of Devbhoomi Dwarka district inGujarat to cater to the requirements of Gujarat and surrounding states. The Site is located at about12 km from Dwarka Town.

It has been confirmed through a letter No. B/24/JMN/T-I0/3544-45/2013-14 dated 01.11.2013 (inGujarati) from Chief Conservator of Forest, Marine National Park, Jamnagar confirming that theproject site does not fall within the boundary of Forest/Marine Sanctuary/ Marine National Park andalso confirming that this project site is not covered within the areas declared as a 'Eco-SensitiveZone (ESZ) declared by GoI vide notification dated 22.08.2013.

Brief description of nature of the project

GSECL have already paid the initial advance for allocation of Government land admeasuringapproximately 175.66 hectares area for setting up the 2 x 800 MW power plant. The proposed siteis uninhabited, non-agricultural land falling out side the CRZ area. However, GSECL is proposing toacquire total land of 210 Ha for main power plant in contiguous to and including the above land. Inaddition, GSECL is proposing to acquire about 160 Ha of land for ash pond and 14 Ha of land forcolony outside the main plant area.

Ministry of Coal, Govt. Of India has allotted Machhakata and Mahanadi Coal Blocks in Talcher coalfields of Orissa to Mahaguj Collieries Ltd. under Govt. dispensation quota. Mahaguj Collieries Ltd. isa joint venture company of Maharashtra State Power Generation Co. Ltd (Mahagenco) and GujaratState Electricity Corporation Ltd. (GSECL). The responsibility of supply of this coal upto designatedpower plants of GSECL is of Mine Developer cum Operator (MDO). However, it is expected thatwashed coal with a calorific value of 4200 kcal/kg and ash contents not exceeding 34% shall bemade available for this plant. This will improve the performance of the plant with reduced coalconsumption and ash generation.

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Transportation of coal from the coal fields of Orissa to the proposed power plant shall be achievedby shipment of coal from Machhakata Mahanadi coal mines to Okha port by MDO and thenTransportation of coal from Okha to Plant Site through railway wagons.

However alternatively, there is an option of the transportation of coal through a customized jetty inthe sea nearby the project site so that the whole power plant can be accommodated within theavailable land and the necessity of the additional land and rail way siding can be avoided.

The total coal requirement at 90% PLF is around 7.0 MTPA by considering 330 days operation in ayear having a GCV of 3773 kcal/kg as design coal. The coal storage is provided for coalrequirement for 21 days based on current practice and considering long distance for coal haulagewhich is around 445,766 MT.

It is proposed to collect 100% bottom ash and fly ash in dry form which is proposed to be utilizedfor industrial purposes as per MoEF guidelines. Ample opportunities for ash use tie-up withprospective users/off-takers exist and the same are proposed to be finalized during constructionphase of the project. The responsibility for transportation of ash from plant area lies with theentrepreneur/off-taker of ash. Provision for transportation of ash by railway wagons and roadtankers has been kept in the layout. During emergency only, ash may be sent to the ash dyke witha provision for storage of ash up to 15mt. level as per CEA norms. A plot of land measuring 160Ha, outside the allocated plot has been selected for ash dyke with a storage of 3 to 9 years ashgeneration as per CEA recommendations, to cater for any exigencies.

Startup and low load fuel oil requirements shall be met from fuel oil system (LDO / HFO) comprisingof tanks/ pumps etc.

The generated power shall be evacuated through 400 kV/765 kV line to 400 kV Bhogat substationproposed which is 50 kms away from the project site.

Space provision will be made for Limestone scrubber type Flue Gas Desulfurization (FGD) system.Make up water for this shall be drawn from the RO Plant or other sources if available.

Sufficient land for rain water harvesting is available in the plot plan. In view of above, consideringthe scarcity of fresh water in the region, a fresh water sump is proposed within the plant boundary.

Conventional redundancies for various systems are considered as per the normal Indian practice.No Rehabilitation and Resettlement is involved in this project.

Owing to high efficiency and lower CO2 emissions per MW generation, this Unit shall be eligible forCDM benefits.

Necessary provisions will be made to minimize water and air pollution from the power plant andrecycling of water will be done as far as practicable.

Need for the project and its importance to the country and or to region.

This Project is planned to supplement availability of power in Gujarat grid. Out of the total presentinstalled capacity in the state of 15306 MW, GSECL's share is only 4996 MW. In the 18th ElectricPower Survey(EPS), the power requirements of the state would be 21,942 MW at Plant Busbars

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(equal to 24,380 MW considering 90% availability) in the year 2018-19 and growing to 26,973 MW(29,970 MW at 90% availability) by the year 2021-2022. On All India basis, 88,000 MW are plannedto be added in the current five year plan (2012-2017).

Moreover, there are many Special Investment Regions (SIRs) planned in the state as notified like:Dholera SIR, PCPIR, Halol-Savli, Navlakhi, Palanpur, Aliyabet etc., which will boost up the industrialpower demand in the state. At the same time, agriculture demands are also going to be increased.GSECL need to cater this power demand through state based own power plants.

Considerable number of old coal fired power plants in Gujarat state have completed theiruseful/economic life and are not able to meet their rated output/efficiency due to various reasons. Apart of such capacity loss shall be compensated with this project. There is also shortage of gasresulting in lower utilization than installed capacity generation from the gas fired power stations inthe region. Any surplus power may be diverted to nearby power deficit states as Power grid hasalready established grid connectivity. Hence the marketability of the surplus power (if any)generated from the proposed power plant is ensured and the plant is expected to run as a base loadplant.

Demand-Supply Gap.

POWER DEMAND ANALYSIS AND JUSTIFICATION OF PROJECT

India is one of the largest growing economies of the world. It is the fourth largest economy and hasshown consistent GDP growth over the past few years. It has been seen from the historical datathat the growth in GDP has a direct relation with the sustained growth of all area of electricity–Generation, Transmission and Distribution. Therefore to maintain the projected level of growth incountry’s economy, it is to be ensured that rapid growth in power sector is maintained. Availability ofpower is one of the major infrastructure requirements for overall development of a nation. Rapidindustrial growth, ever increasing demand in domestic, manufacturing and service sectors coupledwith progressive extension of power transmission and distribution system have led to the rapidgrowth of electricity demand. Despite appreciable capacity additions in Power Sector, the demandfor power has outstripped the availability in many parts of the country. Unlike the ideal conditionswhere the system should have some spinning reserves to meet unforeseen outages and surges ofdemand, Power demand in India has always outstripped the availability. The demand analysis andjustification for setting up of a power plant at any part of the country needs to be corroborated withthe facts and figures of the existing as well as future demand-supply scenario of the area concern inlight of India’s perspective.

From the below provided monthly report, the deficit and available power details of entire India areprovided, in which Gujarat is seen to have 2.1% deficit every month. The demand was 41,184 MWagainst a supply of 40,331 MW. The demand for power requirement is more and produced power isless. Hence, this project would reduce the deficit to certain extent.

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Table : 6 Peak Demand and Peak Met in India

Source: Central Electrical Commission, Monthly report, Oct 2013

Imports vs. Indigenous production.

Since the Project is Power generation, only indigenous production envisaged. The proposed powerplant will use the Indian coal supplied from allotted Machhakata and Mahanadi Coal Blocks inTalcher coal fields of Orissa.

Export Possibility.

The proposed Project is not prospecting export to any foreign country. As it has been planned tooperate as a IPP, the generated power will be connected to grid and further transmitted throughstate grid transmission lines to cater to the requirements of Gujarat and surrounding states.

Domestic / export Markets.Power generated from the Project will be transmitted and sold through National grid network(PGCIL).

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Employment Generation (Direct and Indirect) due to the projectA manpower of 600 is anticipated for operation, maintenance and general requirements of thepower plant. Exact number and deployment of manpower shall be decided during detailedengineering.

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3. PROJECT DESCRIPTION

Type of project including interlinked and interdependent projects, if any.

Gujarat State Electricity Corporation Limited (GSECL) is planning to set up a 2 x 800MWsupercritical coal fired power plant at village Mojap in Dwarka Taluka of Devbhoomi Dwarka districtin Gujarat to cater to the requirements of Gujarat and surrounding states. The Site is located atabout 12 km from Dwarka Town.

The project is interlinked with coal linkage which has been established with supply from GSECL'scaptive mines (under development) of Machhakata and Mahanadi Coal Blocks in Talcher coal fieldsof Orissa.

THERMAL POWER PLANT FLOW DIAGRAM

Mills

Boilerfurnace

ID Fans ESP Boiler stack

Steam path

Flue gas path

Electricity

Coal at storage yard

coal transfer to crusherhouse

coal transfer to bunkers

Boiler

Mills

ID FANSESP Boiler stack

Staem Turbine

Generator

Transformer

Evacuation power throughswitch yard

FD FANS

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1. Cooling tower 11. High pressure steam turbine

20. Fan

2. Cooling water pump 12. Deaerator 21. Reheater

3. transmission line (3-phase) 13. Feedwater heater 22. Combustion air intake

4. transformer (3-phase) 14. Coal conveyor 23. Economiser

5. Electrical generator (3-phase)

15. Coal hopper 24. Air preheater

6. Low pressure steam turbines 16. Coal pulverizer 25. Electrostatic precipitator

7. Condensate and FW pumps 17. Steam drum 26. Fan

8. Surface condenser 18. Bottom ash hopper 27. FGD

9. Intermediate PS turbine 19. Superheater 28. Flue gas stack

10. Steam control valve

SITE DATA The site is located around 12 km north of Dwarka town in Dwarka Taluka of Devbhoomi DwarkaDistrict, Gujarat and about 6 kms & 20 kms south of Mithapur and Okha port respectively. Its westside boundary is close to the Arabian sea. An existing road connecting Jamnagar to Okha passesclose to the Site and approach road from this road to the site shall be constructed during the projectexecution.

Preliminary the elevation of project site is about 4-5 Meters above MSL. No signs of sea wateringress into this plot area were found. There is a small pond in the middle of the plot which shall befilled up to the designed level. On an average about 2 Meters of cutting / filling of the existing landshall be required to develop the land upto designed level. The land is non-agricultural and

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uninhabited but surrounded by village dwellings.

Road connection to Site is available from Ahmedabad via Rajkot, Jamnagar and Dwarka. Theroad connects the Site to Okha port, an all-weather port, which is about 500-mts away. The siteis close to this road.

A broad-gauge railway line, connecting Ahmedabad to Okha port is running parallel to theproject site land at about 550 mtrs. This line may be used for transporting equipment as well ascoal to site after proper studies.

Alternative Sites:Alternative sites were examined and the coordinates of alternative sites are given below;Site:1Village: Koddha Area: 787 haCoordinates: 2331’17.80”N 7127’50.44”E2331’29.50”N 7128’49.74”E2332’23.40”N 7128’32.67”E2332’09.60”N 7127’32.78”E

Site:2Village: BhadradaArea: 332 haCoordinates: 2349’20.79”N 7159’49.28”E2349’14.03”N 7200’52.39”E2349’35.68”N 7201’02.04”E2350’10.54”N 7200’40.86”E2350’12.33”N 7200’04.18”E

Site 3: Proposed Site Location The Geographical Coordinates of the proposed plant site corners are;

2223’16.28”N 6858’19.38”E2223’12.23”N 6858’48.13”E2221’56.31”N 6858’28.16”E2221’56.78”N 6858’03.86”E2222’02.81”N 6857’46.95”E

The reasons for site selection criteria

The site 3 is a government waste land

No R&R issues

There are no habitations encroachment in the project site

Good road connectivity

Rail connectivity

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No tribal settlements in the project site

There are no archaeological monuments near project site

Based on the above points the site 3 at Mojap village is considered as proposed project site.

Fuel

The total coal requirement at 90% PLF is around 7.0 MTPA; coal having a GCV of 3773 kCal/kg(design coal).The source of this coal is from Machhakata mine in Orissa. However the plant canalso be operated with worst coal having a GCV of 3148.5 k call kg.

Presently, run of mine coal analysis has been considered for the design. It is anticipated that a coalwashery shall be installed near the allocated mines and washed coal with a calorific value of 4200kcal/kg and ash content not above 34% shall be available for the plant. Plant performance isexpected to improve with the use of washed coal and this will also provide additional capacitymargins over those considered in this report.

Fuel Analysis of Design and Worst coal is given below. This is based on the minimum andmaximum values of constituents available from GSECL.

Minimum/ Design/Worst Maximum

As received As received PROXIMATE ANALYSIS

Moisture %

5.8/8.05 6.92/8.05 weight

Volatile Matter %

22.15/28.6 25.37/22.15 weight

Fixed carbon %

23.25/34.2 28.72/23.25 weight

Ash %

33.30/44.85 39.07/44.85 weight

ULTIMATE ANALYSIS

Carbon %

34.05/46.85 40.45/34.05 weight

Hydrogen %

2.2/3.06 2.63/2.2 weight

Sulphur %

0.55/1.0 0.775/1.0 weight

Oxygen %

7.71/10.77 9.24/10.77 weight

Nitrogen %

0.8/1.1 0.95/1.1 weight

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HEATING VALUE

High Heating Value (HHV) - Kcal/kg 3148.5/4397.5 3773/3148.5

Grindability Index ( HGI ) 60.5/78.0 69.25/78

Layout

a) The layout has been developed as per the area proposed to be allocated / acquired byGSECL for Mojap Power Project. The total main plant area is about 210 Ha. The main plantis located towards the north side with the power evacuation from the eastern side towardsthe Okha - Ahmedabad road. All the BOP facilities have been arranged along the southernside of the plot. No equipment/plant except CW Pump House is located within the CRZ.Location of Pump House is planned outside the plant area, at a suitable locationonshore/offshore.

b) Three single phase transformers are considered as generator transformer for each unit withone spare (common for both units).

The following plant equipment (buildings) have been considered: a) TG building (common for two units) b) Boiler Area (for each unit) c) ESP Area (for each unit) d) ID Fans for each unit) e) Single two flue chimney (common for two units) f) Limestone FGD (for each unit) g) MCC for Limestone FGD (common for two units) h) Intake CW Pump house (common for two units) i) Auxiliary Boiler j) Water treatment plant including RO system (common facility)k) Open switchyard (common facility) 1) Coal yard - coal unloading, crusher house, storage with stacker/ reclaimers, conveyor

system etc. (common for two units) m) Ash silos with wagon/road truck loading facility (common facility) n) Ash dyke for 3/9 year storage (area of 50-140 Ha. as per CEA norms) outside main plant

boundary is being sought for ash storage during the period ash offtake does not matchash generation (common facility).

Space provision is kept adjacent to the chimney for the FGD system to be installed in future (ifrequired), which consists of the following.

a) Absorber system b) Lime stone / Gypsum Slurry System c) Oxidation Air System d) Process Water System e) Drainage system

Coal yard is envisaged with consideration of the following alternatives: a) Coal shall be brought from mines through sea route at Okha port. Jamnagar Okha Port

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Railway line is passing about 150 m near the project site. A dedicated railway track shall beprovided from the nearby place. The coal shall be unloaded through wagon tipplers which candistribute it either to stock yard or bunkers or even both simultaneously as per the incomingquantity and requirement. Provision for fly ash and bottom ash evacuation through railwaywagons has been made in view of large quantities of fly ash generation.

b) However alternatively, there is an option of the transportation of coal through a customisedjetty in the sea nearby the project site so that the whole power plant can be accommodatedwithin the available land and the necessity of the additional land and railway siding can beavoided. GSECL shall explore the feasibility of the above through a competent agencies andavailing of approval of competent statutory / non-statutory bodies like Gujarat Maritime Board(GMB) and other associated bodies. Area covered of main buildings/structures/systems as per the plot plan are as follows:-

Sl. No. Description Area (Ha)I Main Plant Area

1 Boiler & Auxiliaries 102 Turbine Generator set & it's auxiliaries 5

3Conventional (Outdoor) Switchyard / GI Switchyard

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4a Railway siding 304b Coal handling and storage 505 Water treatment plant 306 Area for rain water harvesting 107 Green Belt 70

Total 210II Off-site facilities

Ash Dyke 160 Colony 14

Major Systems and Mechanical Equipment

Water Steam Cycle Water/steam cycle based on supercritical parameters of Main steam (MS), single re-heat, aregenerative feed heating cycle with condensate polishing unit is envisaged. Cycle parametershave been selected on the basis of existing plants of similar capacity with proven design which alsomeet the requirements of CEA.

Regenerative feed heating cycle shall consist of LP heaters, one drain cooler/drip pump, de aeratorand RP heaters in line with manufacturers practice. Feed water shall be heated by uncontrolledextraction from steam turbine inter-stage tap-off and cold reheat line in feed water heaters.0 TheDeaerator shall normally operate under variable pressure on extraction steam from the turbine.Each feed water heater shall be capable of handling the drains from the preceding heater underoperating conditions of the unit, however drip pump for forward cascading of drains at LP heater 1may be provided by the turbine manufacturer depending upon practice and cycle optimization.Condensate polishing unit is envisaged for the total condensate to meet the boiler water chemistryrequirements.

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Heaters shall be arranged for removal from service and by-passing of condensate flow around eachheater individually except for HP heaters where group bypass shall be provided. Three boiler feed pumps of 50% capacity, two steam turbine driven and one motor driven shall beprovided. The system shall also be provided with suitably sized HP/LP bypass system to meet therequirements of start-up, load throw-off etc.

The equipment shall be designed in accordance with latest applicable standard/codes of HEI,ASME, IBR etc. The feed water heaters shall be of U-tube with stainless steel tubes, surface type,horizontal with integral condensing and drain cooling zones. The HP heaters shall also have de-superheating zone. Performances

The main parameters of 2 x800 MW unit at 100 % BMCR will be as follows:-

Main steam pressure at Super heater outlet 256 bar Temperature at super heater Outlet 567oC Steam Temperature at re-heater outlet 595O C

These steam parameters are based on supercritical steam cycle of good performance (efficiency)as well as proven designs and existing units of similar rating. These are also the CEArecommended parameters for 800 MW supercritical units.

The station (2 units of 800 MW each) performances are expected with design coal firing (HHV of3773 kcal/kg) , 1 bar pressure and 30°C inlet cooling water temperature and 7°C rise in temperaturethrough the condenser. Heat Rate considered is 2212.8 KCals/kWh.

Because of high efficiency and lower CO2 emissions per MW generation, this Unit shall be eligiblefor CDM benefits. As an indicative estimate, a reduction in CO2 emission of 75 t/ MW year for eachpercentage increase in efficiency can be considered which will give about 13 million metric tons ofC02 reduction for the power plant over its life time of 30 years, considering only 4% increase inefficiency over the conventional cycle.

Boiler / Steam generator The Steam generators shall be once through, direct pulverized coal fired, top supported, balanceddraft furnace, single reheat, radiant, dry bottom type suitable for outdoor installation. The gas patharrangement shall be single pass (tower type) or two pass type depending upon vendor practice. Boiler design shall be suitable for variable pressure operation from 50% to 100% BMCR. Coalburners and furnace shall be designed to achieve minimum levels of NOx generation without theuse of SCR. NOx contents in flue gas shall be controlled through proper design of burners. Theboiler shall be designed for operation with design coal (HHV of 3773 kcal/kg) but shall be able togenerate BMCR steam with worst coal (HHV of 3148 kcal/kg). When washed coal of 4200 kcal/kgHHV and 34% ash content is available, boiler performance is expected to improve.

The furnace will be radiant, dry bottom type with tangential or opposed wall firing and enclosed bywater cooled membrane welded walls. The furnace bottom shall be suitable for installation of a drybottom ash hopper. Spray type attemperator is envisaged to control the superheater outlettemperature at varying loads. The superheater and reheater tubes will be a combination of radiationand convection type. Economiser will be non-steaming type and shall be of modular construction so

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that if required, addition of loops is possible.

The coal burning system will comprise of coal mills of vertical spindle type which include (a) bowlmills (b) roller mills (c) ball & race mills or any approved equivalent. The number and capacities ofthe mills shall be so selected to meet BMCR requirements while firing the worst and design coalswith one mill spare. Seven mills are considered to be sufficient for this purpose; however space foradditional one mill shall be kept.

Coal from coal bunkers will be fed into the mills by belt driven gravimetric coal feeders .There will betwo axial P.A fans for transporting the pulverized coal from mills to burners.

The boiler shall meet the requirement of sustained high efficiency and availability, high efficiency atpart load, flexibility to burn coal within the range specified, and quick startup. Furnace shall be sizedfor burning high ash coal and low flue gas velocities to minimize erosion. Required number of sootblowers shall be provided. The boilers shall be complete with following systems:

• Fuel oil ignition and control system • Mill reject handling system • Pulverized coal firing system • Coal bunkers • Air and Flue gas system, etc.

DeNOx / SCR (Not Required) DeNOx /SCR is not considered to be provided as the boiler will be designed with low NOx burners and a stack of 275 m as per CPCB requirements shall be provided.

Electrostatic Precipitator It is proposed to install high efficiency electrostatic precipitator having an efficiency that limits theoutlet emission to 50 mg/Nm3 while the boiler is operating at its MCR, firing worst coal havingmaximum ash content The electrostatic precipitators can have upto eight (8) parallel gas streams(two in each section of ESP), isolated from each other on the electrical as well as gas side and willbe provided with gas tight dampers at inlets and outlets of each stream, so as to allow maintenanceto be carried out safely on the faulty stream, while the unit is working. ESP specific collection areashall not be less than 200 m2/m3/sec at 100% BMCR. Electrostatic precipitator will be provided withmicroprocessor based programmable type rapper control system and ESP management system toensure the safe and optimum operation of ESP.

In order to meet the environment norms and maintain the sustained efficiency of ESP, it shall beadequately designed with sufficient margins for all operating conditions. The ElectrostaticPrecipitator Management system (EPMS) in conjunction with opacity monitor shall continuouslymonitor and maintain the optimum energy level to achieve higher efficiency of ESP.

Flue Gas Desulfurization Space provision for the FGD system is kept, to be installed in future (if required) adjacent to thechimney. The design and layout of steam generator and its auxiliaries will be such that a wet/dryflue gas desulphurisation system can be installed in future, taking suction from duct after ID fan andfeeding the desulphurised flue gases back to the chimney with provision for bypassing the FGDsystem.

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Stack Two flue stack with concrete casing and a height of 275 m shall be provided in line with MOEF norms and designed as per BIS.

Auxiliary Boiler Steam may be required for initial commissioning/cold start of the Boiler. Installation of a permanentauxiliary boiler or hiring of auxiliary boiler for this purpose shall be reviewed during engineering ofthe Project.

Turbine and Generator The 800 MW capacity steam turbine shall operate with supercritical main steam parameters, shallbe tandem compound, single reheat, regenerative, condensing multi cylinder design with-HP, IPand LP casings, directly coupled with the generator suitable for indoor installation. The plant wouldbe designed to operate as a base load station but shall also be capable of operating at part load.

The turbine design shall cover adequate provision for quick start-up and loading of the units to fullload at a fast rate. Apart from constant pressure operation, the turbine shall also have the facility forsliding pressure operation. Depending on the capability of the machine, alternative for overpressureoperation (under VWO (Valves Wide Open)) shall be considered. The turbine shall be provided withsuitable margins for VWO flow. The Steam Turbine along with its integral systems and auxiliaries like lube oil system, control-fluidsystem, condensers, condenser air evacuation system, HP & LP bypass system, completeregenerative feed heating system, condensate pumps along with their drives, boiler feed waterpumps along with their drives, LP chemical dosing system, automatic turbine run-up system,instrumentation and control devices, turbine supervisory instruments, turbine protection andinterlock system, automatic turbine testing system and turbine hall EOT cranes shall be provided. Generator shall be hydrogen/water cooled having rated output of 990 MVA, 0.85 power factor (lag),3000 rpm, with static/brushless excitation system. Generation voltage shall be 22 kV ormanufacturer standard.

Condensate and Feed Water Condenser Double pass condenser with titanium tubes shall be adopted. The condenser shall be of dividedwater box construction, horizontal, surface type with integral air cooling section. Condenser hot wellshall be sized for three (3) minutes storage capacity (between normal and low-low level) of totaldesign flow with the turbine operating at V.W.O. condition, 1 % make-up, design back pressure.

Air Extraction System It shall comprise of (2x 100%) vacuum pumps along with all accessories and instrumentation forcondenser air evacuation. The vacuum pumps and accessories shall be used to create vacuum byremoving air and non-condensable gases from steam condenser during plant operation. Vacuumpumps shall be of single/two stage liquid ring type with both stages (if two stage pump is selected)mounted on a common shaft. Vacuum pumps shall be sized as per latest HEI requirements.

Requirement of Vacuum Pump vis a vis Air Ejectors shall be checked during detailed engineering,clearly bringing out merits and demerits of their use in integrated plant of similar capacity.

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Boiler Feed Water Pumps It is proposed to have 2x50% turbine driven and 1x50% motor driven boiler feed pumps with thebooster pumps mounted on the common shaft. Each pump shall be designed to give parameters tosuit the steam generator requirements such that two feed pumps shall be capable of meeting the fullrequirement of the boiler turbine unit with the third pump as a standby. Both TDBFP and MDBFPshall be accessible to turbine house EDT crane for erection and maintenance. The boiler feed watersystem shall be designed to operate primarily in an automatic mode over the range of systemdesign loads. The arrangement will provide automatic start-up of the standby motor driven feedpump under conditions like tripping of running TDBFP's, discharge header pressure low etc.

The feed flow shall be controlled by turbine speed control through throttling the steam inlet controlvalve of drive turbine in case of turbine driven pumps whereas hydraulic coupling-shall be utilised toachieve speed control of motor driven pumps.

Deaerator Horizontal, direct contact spray or spray cum tray type de aerator with a horizontal feed waterstorage tank shall be provided. The de aerator shall be capable of deaerating all the incomingcondensate and HP heater drains. It shall effectively remove the dissolved oxygen in condensateand completely remove the traces of carbon dioxide. The minimum capacity of feed water storagetank shall be based on 6(six) minutes of BMCR feed water flow (approx.) between normal operatinglevel and low-low level with a filling factor of 0.66. The de aerator shall operate without any vibrationand water hammer during any transients, loss of full load followed by HP- LP bypass coming intooperation and at any steady load from. 0% to 110% of rated capacity. The de aerator shall bedesigned to give dissolved oxygen content not greater than 0.003 ml/litre in feed water at thedeaerator outlet under all operating conditions.

Condensate Pumps Each unit shall have 2 x 100% or 3x50% (to be decided at engineering stage) capacity motor drivencondensate extraction pumps (one operating and one standby). The condensate pumps shall bevertical canister type, multistage, centrifugal diffuser design with a double suction first stagedesigned for condensate extraction service having low suction head requirement. The pumps shallbe capable of handling the condensate from the condenser together with feed heater drains whenthe machine is operating at maximum unit output with HP Heaters out with 1 % make-up anddischarging this quantity through the gland steam condenser and condensate polishing unit.

The pump shall have adequate margins on capacity and head to cater for most adverse conditions of operation such as:

a) HP &.LP bypass in operation. b) HP heaters out of service and unit operating at its maximum load during an under frequency

operation (i.e. at 47.5 Hz).

HP/LP Bypass HP and LP bypass stations shall be envisaged to meet the following requirements and adequately sized: a) Quick startup of the steam generator from cold, warm & hot conditions. b) Parallel operation of the bypass with turbine in the event of large load throw-off. c) House load operation followed by large load throw-off. d) To keep the steam generator in operation so as to avoid a fire out in the steam generator

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following full load rejection.

Sampling and Chemical Dosing The purpose of LP dosing system is to maintain the pH of condensate and feed water and toeffectively deal with residual dissolved oxygen in condensate and feed water. The arrangementshall consist of the total system for dozing ammonia at Boiler feed pump suction and on condensateline. Oxygen dosing system shall also be provided if same is required.

Condensate Polishing PlantFor maintaining the feed water purity condensate polishing plant shall be provided in the feed watercycle at the downstream of condensate extraction pumps as per the existing practice. Thecondensate polishing plant shall be of full flow, deep mixed resin bed type consisting of 3x50%capacity service vessels for each unit. The resins to be used would be strongly acidic cation andstrongly basic anion type, appropriate for condensate polishing system. A common externalregeneration facility shall be provided. The exhausted charge of resins from the service vessel shallbe hydraulically transferred to the resin separation/cation regeneration vessel for regeneration andreuse. Spare charge of resin shall be kept in the mixed resin storage tank for immediate exchangeof resins with the exhausted ones. One additional charge of resin shall be procured for use duringstartup of the unit. Acid, Alkali & DM Water Storage for regeneration, and Wastewater Neutralisationfacilities shall be provided separately for the external regeneration facility. Condenser Cooling Water (CW) and Auxiliary Cooling (ACW) SystemOnce through cooling water system is proposed to meet the cooling Water requirements ofcondenser and auxiliary cooling water system. Once through cooling water system is advantageousfrom the plant efficiency point of view, and is proposed due to proximity of the sea to Site. Total seawater requirements for condenser cooling, ACW and chlorination system is estimated as 223,935m3/hr. (Refer Annexure 3) Sea water (cooling water) pump house is proposed to be located at sea shore. It shall consist of the following:

• Bar screens with raking mechanism • Travelling band screens • Chlorine dosing system • Stop gates CW pumps to cater to condenser cooling water and auxiliary cooling water requirements • Raw water pumps for RO system

Number of pumps and other equipment shall be decided during engineering stage. Cooling water from condenser and auxiliary cooling water from plate heat exchangers shall be ledback to sea through an open /partially closed canal or pipes (to be decided at detailed engineeringstage). Brackish water from RO plant shall also be added in this channel for disposal to sea. Thisoutlet may be separated from the intake through a 'break water wall' located suitably Adequatearrangements shall be made to ensure that the water discharged to sea meets the MoEFstipulations.

Raw Water Supply System The raw water requirement (on sea water basis) for proposed 2x800 MW units is around 2023m3/hr. This raw water shall be supplied by 2x100% Raw Water pumps located in the sea waterpump house. This raw water shall be used for the generation of Desalinated (RO system),potable/service water and DM water to meet various needs of the plant.

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Water Requirement Water requirements of the main consumers are calculated as follows

RO and DM water system (at inlet of clarifier) 2023 m3/hr

Electro-chlorination Plant (to be drawn from CW system 135 m3/hr

The Desalinated water from RO Plant shall be used to feed DM plant, Potable water system, servicewater requirement and Coal handling plant requirement total of which works out to around 769m3/hr. The Sea Water Reverse Osmosis (SWRO) technology shall be used to meet the entire soft waterrequirements of the plant. Sea water shall be first treated in a pretreatment plant to make it suitablefor further treatment in the RO membranes. The pretreatment plant shall consist of a clarifier anddual media filters to reduce the turbidity present in the sea water to the level acceptable for ROsystem. Sea water shall also be used for the electro-chlorination plant for generation of hypochlorite solutionto meet chlorine dosing requirements of water system. The sea water requirement for this isestimated around 135 m3/hr.

Desalination plant Sea Water Reverse Osmosis (SWRO) technology shall be used for the Desalination plant. The recovery water from SWRO shall not be less than 40%. Desalinated (RO) water shall be used in the following systems:

Input to DM Plant

Potable and service water system

Fire water system

Water requirements of Coal Handling and ash handling plants • Misc. requirements.

The reject of SWRO shall be collected in the blowdown sump from where it shall be led to CW channel for discharge to sea along with CW.

Demineralised (DM) Plant Desalinated water from RO plant shall be further treated in second Stage RO and Mixed Bed(MB) units to get the water of suitable quality for use in the boiler water make up. DM water shallbe used as feed cycle make-up, DMCCW cycle make-up, CPU regeneration and for ChemicalDosing system requirement. DM water requirement of the proposed 2x800 MW plant is estimated around 3096 m3/day.

Demineralised Closed Cooling Water (DMCCW) System The DMCCW system meets the cooling water requirements of the auxiliary equipment related toTG & SG units such as turbine lube oil coolers, hydrogen coolers, seal oil coolers, stator watercoolers, IDIFD/P A fans' bearing oil coolers, mill lube oil coolers, BFP auxiliaries such as lubeand working oil coolers, seal water coolers, drive motors, etc., condensate pump bearings, airpreheater bearings, sample coolers, air compressors and ash handling system compressors.

A closed loop system using passivated DM water is proposed for the DMCCW system. The DMwater is circulated through the auxiliary coolers by auxiliary cooling water (ACW) pumps. The hot

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water from the auxiliaries is cooled in the plate type heat exchangers by the circulating waterfrom the CW pumps.

Effluent Recycling and Reuse systemAn adequately sized effluent treatment plant shall be provided for treating various effluents (fromsoft water circuit) and treated water from this plant is proposed to be recycled (make-up tocoal/ash water system) and for horticulture on the concept of zero discharge system.

The oil sumps will collect water from areas where there are possibilities of contamination by oil(for transformer yard, fuel oil storage area etc.) and the drains from such areas will be connectedto an oil separator. From the oil separator the clear water will be discharged to CommonMonitoring Basin (CMB), while the oily waste sludge will be collected separately and disposed offin solid/sludge form.

The mixed bed unit and CPU regeneration effluent shall be collected in neutralizing pit andtreated as per requirement before discharge to CMB.

The network of drains will collect run-off water from the coal handling area (especially duringrainy season) and lead to a pond. Coal particles will settle down in the pond and the overflow willbe led to monitoring basin.

Hydrogen Generation PlantHydrogen required for generator rotor cooling and initial fill up shall be supplied from theHydrogen Generation Plant located near the Power House.

Compressed Air SystemCompressed air requirement for Instrument air and Service air shall be met from suitably sizedCompressed Air Plant. Identical rotary oil free compressors shall be provided both for service aswell as instrument air. Instrument air system shall be provided with adequately sized air dryers tomeet instrument air requirements.

Fire Protection SystemFire Detection and Protection system shall generally conform to the recommendations of TAC (INDIA)/ IS: 3034 & NFPA- 850. The following fire detection and protection systems are envisaged :-

1. Hydrant system will be used for complete power plant covering the entire powerstation including all the auxiliaries and buildings in the plant area. The system shallbe complete with piping, hydrants, valves, instrumentation, hoses, nozzles, hoseboxes / stations etc.

2. Automatic high velocity water spray system will be used for all transformers locatedin transformer yard and those of rating 10 MV A and above located within the plantboundary, main and unit turbine oil tanks and purifier, lube oil piping (zoned) inturbine area, generator seal oil system, lube oil system for turbine driven boiler feedpumps. The system shall be completed with detectors, deluge valves, projectors,valves, piping, instrumentation etc.

3. 3. Automatic medium velocity water spray system will be used for cable vaults andcable galleries of main plant, switchyard control room, CHP control room and ESPcontrol room. The system shall be complete with smoke detectors, linear heat

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sensing cable detectors, deluge valves, isolation valves, piping, instrumentation, etc. 4. 4.Automatic medium velocity water spray system will be used for coal conveyors,

coal galleries, transfer points and crusher house. The system will be consisting of QBdetectors, linear heat sensing cables, deluge valves, nozzles, piping,instrumentation, etc.

5. 5. For protection of control room, equipment room, computer room and otherelectrical and electronic equipment rooms, Inert Gas extinguishing system as perNFPA-2001 will be used.

6. 6. Fire Detection and Alarm System A computerized analogue, addressable type early warning system shall be providedto cover the complete power plant. Following types of fire detection shall beemployed. a. Multisensor type smoke detection system b. Photo electric type smoke detection system. c. Combination of both Multisensor type and photo electric type smoke

detection systems. d. Linear heat sensing cable detector. e. Quartzoid bulb heat detection system. f. Infra red type heat detectors, g. Spot type heat detectors.

7. Portable and mobile extinguishers, such as pressurised water type, carbon-dioxidetype, foam type, dry chemical powder type, will be located at strategic locationsthroughout the plant. These extinguishers may be used during the early stages of fireto prevent fire spreading.

8. Complete instrumentation and control system for the entire fire detection andprotection system shall be provided for safe operation of the complete system.

Storage and Handling Systems / Equipment

Coal storage and handling The total coal requirement at 90% PLF is around 7.0 MTPA, with coal having a GCV of 3773kCal/kg (design coal- based on run of mine coal supply) considering plant operation for 330 daysper year. Blending of coal in the ratio of 30:70 (Imported: Indigenous coal) has been considered as per CEA guidelines. The coal storage is provided for coal requirement for 21 days which is around 4,45,766T.

Coal Handling Plant Coal Handling Plant shall be designed for feeding the boiler bunkers at the rate of 884.5 T/hr at90% plant load factor considering maximum plant heat rate as 2317.4 kCal/kWh as per CEAguidelines. As per this, 21,227 T per day of coal will be required for 2x800MW and is roughly about7.0 MTPA annual requirements.

Coal Unloading Coal shall be brought from port/mines with following two alternatives:

a) Coal shall be brought from mines through sea route at Okha port. Jamnagar -Okha Port Railway line is passing about 150 m near the project site. A dedicatedrailway track shall be provided from the nearby place. The unloading facilities in

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the plant comprises of railway yard as shown in the plot plan with 3 number ofWagon tipplers (2W+1S). Adequate number of pre tippling lines, post tipplinglines and by pass lines to Wagon tipplers are being considered. The coalunloaded through hoppers may be carried further to crusher house byunderground conveyors.

b) However alternatively, there is an option of the transportation of coal through acustomised jetty in the sea nearby the project site so that the whole power plantcan be accommodated within the available land and the necessity of theadditional land and railway siding can be avoided. GSECL shall explore thefeasibility of the above through a competent agencies and availing of approval ofcompetent statutory / non-statutory bodies like Gujarat Maritime Board (GMB)and other associated bodies.

Coal Storage The coal storage of 445,766 MT of Crushed coal equivalent to 21 days requirement shall be ideallystored in the stock yard, as indicated clearly in the layout. Two numbers of reversible bucket wheelstacker cum reclaimers of required capacities are envisaged in the stock yard with one working +one standby philosophy. Ground hoppers shall be considered in the system for emergencyreclaiming.

Coal Transportation The coal conveying system consisting of direct path from Wagon tippler complex to bunkers andindirect path from stock yard to bunkers & also from wagon tipplers to stock yard shall be designedfor a maximum capacity of 1750 TPH but with a rated capacity of 1500 TPH considering two shiftoperation of the plant. A crusher house is envisaged in the layout for crushing down the coal torequired size before it is fed to the bunkers and stock yard. Number of crushing stages shall befinalized during detailed engineering depending upon the size of coal received. A 100% redundancyfor belt conveyors/equipments has been considered for the whole system.

However alternatively, there is an option of the transportation of coal through a customised jetty inthe sea nearby the project site so that the whole power plant can be accommodated within theavailable land and the necessity of the additional land and rail way siding can be avoided. GSECLshall explore the feasibility of the above through a competent agencies and availing of approval ofcompetent statutory / non-statutory bodies like Gujarat Maritime Board (GMB) and other associatedbodies.

Ash Handling Plant The Ash handling system shall be designed with separate schemes for bottom / coarse ash and forfly ash handling with 100% dry system for both. It is proposed to collect 100% bottom ash and flyash in dry form which will be utilized for industrial purposes like brick manufacture, additives incement, land filling etc. As per calculation, the total ash generated is about 9520 T/day on the basisof 44.85% ash content in coal (worst coal). Out of this, bottom ash generation (expected) shall be1904 T/day & Fly ash 7616 T/day. Prospective users of bottom and fly ash shall be contacted forremoval of ash from power plant area in line with MoEF stipulations for which tie ups withprospective users shall be finalized during Project execution.

For each unit, bottom ash shall be evacuated on continuous basis using dry Bottom Ash Evacuationsystem with dry scrapper chain conveyor having a design capacity of about 45 TPH. This bottom

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ash shall pass through an intermediate SILO of 100 T (>2 hours) capacity through a suitably sizedcrusher whose output is tuned to ( ~ ) 10mm. The same will be conveyed to a 720 T capacity silo at45 TPH by pneumatic conveying. The ash inside the bottom ash silo having a minimum of 16 hoursstorage will be evacuated by train rakes through telescopic sprouts. Evacuation of bottom/fly ashthrough road tankers shall also be provided, if considered feasible, during detailed engineering.

The Fly ash from ESP hoppers, APH hoppers, Economiser hoppers & duct hoppers shall beevacuated every six hours in a shift of eight hours using pneumatic conveying system to fivenumbers of fly ash silos of 1500 T capacity each, (24 hours storage) located in the railway yard withprovision to load the wagons at a maximum rate of one rake per shift. Due to high quantity of ashgeneration, evacuation through road tankers is not considered practice. However, this aspect shallbe studied further during detailed engineering phase and road tanker loading provided, if foundfeasible.

There are many diverse uses of power station ash (see ash usage pattern given below). MoEFstipulates that ash should be given free of cost to prospective users (brick kiln operators, cementmanufacturers, civil contractors etc.) for at least first three years of operation of the power plant. Theresponsibility for transportation of ash from power plant to its place of use shall lie with the off-taker.Fly ash removal through railway wagons has been envisaged in view of large quantities involved -approximately one rake (58 wagons) per shift. NTPC have employed similar system for ash removalin some of its plants.

Civil And Structural

Plant Grading The land is practically levelled, however average elevation difference of various points (as perattached contour survey map - considering 100 as a Temporary Bench Mark (TBM) is about 2-3meters. Preliminarily the elevation of project site is about 4-5 meters above MSL. No signs of seawater ingress in to this plot area were found. There is small pond in the middle of the plot whichshall be filled up to the designed level. On an average, about 2 Meters of cutting/filling of theexisting shall be required to develop the land up to designed level. Drainage system shall bedesigned to collect and store rain water for use in the plant. It is proposed to collect rain waterthrough various storm channels to a suitably sized pond for usage during exigencies. Requirementsof piling is anticipated but can be ascertained after the soil investigation report is available. Sitetopographical survey as well as soil investigation shall be carried out before start of engineeringdesign. Looking to site location in coastal and extreme adverse marine conditions, proper care /precautions for designing Civil & structures works shall be taken to avoid deterioration andconsequential impact on running of the plant.

Foundation System Turbo Generator (TG), ID, PA & FD Fans shall be supported on a RCC top deck, which shall rest onsteel helical spring units and viscous dampers. For TG foundation, steel helical spring units & viscous dampers shall be supported on an RCC,framed sub-structure. The sub-structure shall be supported on a base-mat. Steel helical spring units& viscous dampers for ID, PA, & FD Fans shall be supported on RCC sub-structure which in turnshall be supported on base raft.

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The boiler feed pump shall be supported over block foundation resting on ground. The mill foundation shall consist of RCC block supported on pile foundation Main Plant Structural System Main plant complex shall consist of the following buildings and facilities.

a. Main Power House b. Boiler structure & foundation c. Mill / Bunker Building d. Conveyor Galleries e. Pipe and Cable Racks f. Auxiliary Buildings

For the selection of the type of foundations to suit the requirements for major auxiliaries like TG setetc, necessary 'Geo technical survey report' shall be done through a competent agency to assessthe Soil Bearing Capacity (SBC) of the project site land with reference to it's suitability for ThermalPower Plant.

ChimneyOne RCC Chimney (containing two internal flues) shall be provided for 2 x 800 MW units of theproject. The flue gas emission point shall be 275 m above the plant grade level. The grade ofconcrete for shell shall be of M - 30 and for foundation it shall be M- 25 grade. However looking to site location in coastal and extreme adverse marine conditions, proper care /precautions for designing Civil & Structures works shall be taken to avoid deterioration andconsequential impact on running of the plant.

Power Evacuation It is proposed to evacuate power at 400 kV / 765 kV voltage level from this station depending uponthe ultimate requirements. Power Generated from 2x800 MW units would be stepped up to theevacuation voltage level through suitably rated Generator Transformers and will be evacuatedthrough 400/765 kV transmission lines. GCB is not envisaged for fitment.

Six Nos. of 400/765 kV outgoing transmission lines have been considered for power evacuationpurpose. However, based on the final power sale agreements with trading companies andbeneficiary statesl regions of the project, the Associated Transmission System (ATS) would befinalized. Route (corridor) for power transmission lines shall be decided during design engineeringstage. Also two Nos of Bus reactors have been considered to be connected to the 400 KV system tocontrol over voltage during line charging and sudden load throw off condition. At about 50 kms awayfrom the project site a 400 kV Bhogat substation is proposed by STU (Gujarat Energy Transmissioncorporation Limited (GETCO)).

In view of the space constraints two plot plans have been prepared i.e with provision of GIS Switchyard and with provision of Conventional (Open) Switch yard. GIS switch yard is preferred in thecoastal regions though it is costly. Selection of GIS Vs Conventional (Open) Switch yard shall befinalized during detailed engineering.

Construction Power Requirement About 5 MV A construction power shall be taken through 11 KV feeders from the nearby 66KV / 11KV Sub-station.

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Environmental AspectsAir Pollution Flue gases shall be treated in ESP to bring the particulate matter content within 50 mg/Nm3 andFlue gas desulfurization (FGD) (in case required) shall meet the MOEF/GPCB requirements withregard to sax. The Boilers shall be designed to achieve minimum level of NOx generation. MoEFspecifies limit of 150 mg/Nm3 for particulate matter in flue gases. No limits for SOx and NOx arespecified but are supposed to be covered in the provision of 275m high stack for plants of this sizeas per MoEF requirements, so as to meet the ground level concentrations as specified.

In order to meet the environment norms and maintain the sustained efficiency of ESP, it shall beadequately designed with sufficient margins for all operating conditions. The ElectrostaticPrecipitator Management System (EPMS) in conjunction with opacity monitor shall continuouslymonitor and maintain the optimum energy level to achieve higher efficiency of ESP.

CEMS (Continuous Emission Monitoring System) shall be installed at stack for continuousmonitoring of NOx, SOx, CO2, 02 , CO and PM. Boiler and ESP shall be designed to meet therequirements of these pollutants in flue gas. Sulphur dioxide content in flue gas is not expected tobe high due to low sulphur content of coal proposed to be used. Still, space has been kept for theinstallation of Flue Gas Desulphurization (FGD), if required in future to meet MoEF requirements.NOx emissions shall be kept under control through proper design of boiler furnace and burners.

Owing to high efficiency and lower CO2 emissions per MW generation, this Unit shall be eligible forCDM benefits. As an indicative estimate, a reduction in CO2 emission of 75 t/MWyear for eachpercentage increase in efficiency can be considered which will give about 13 million metric tons ofCO2 reduction for the power plant over its life time of 30 years, considering only 4% increase inefficiency over the conventional cycle.

A two flue stack of 275 m high shall be provided in line with the requirements of MoEF.

Water Effluents Temperature rise and chlorine content of condenser cooling water at the outfall shall be maintainedas per MoEF norms through proper design and operation control. STP and ETP shall be designedon zero discharge concept with disposal of solid waste only. Treated effluents from STP and ETPshall be used in horticulture. Sea water outfall consisting mainly of condenser cooling water shall bemonitored for pH, chlorine contents and temperature, to meet the following requirements as perpollution control norms.

The details of permissible temperature of discharge water to sea and anticipated for the project shallbe mentioned and further actions to taken by GSECL for availing clearances from Marine authority.

NoiseNoise abatement techniques. Like Acoustic enclosures shall be provided wherever necessary, tokeep the noise level within acceptable limits. Far field noise level, at 3 m from plant boundary shallnot exceed 75 dB(A) as required per norms.

Proximity To Marine National Park & Sanctuary It has been confirmed through a letter No. B/24/JMN/T-10/3544-45/2013-14 dated 01.11.2013 (inGujarati) from Chief Conservator of Forest, Marine National Park, Jamnagar confirming that the

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project site does not fall within the boundary of Forest /Marine Sanctuary/ Marine National Park andalso confirming that this project site is not covered within the areas declared as a 'Eco-SensitiveZone (ESZ) declared by Gol vide notification dated 22.08.2013.

Man Power And Organizational A manpower of 600 is anticipated for operation, maintenance and general requirements of thepower plant. Exact number and deployment of manpower shall be decided during detailedengineering.

Location (map showing general location,specific location, and project boundary& project site layout)

Quantity of wastes to be generated (liquid and solid) and scheme for theirManagement/disposal.

All the necessary equipment and systems will be provided in the plant to meet all applicableenvironmental regulations. The plant has been proposed to have the following features, which willhelp in minimizing emissions and effluents.

DeNOx /SCR is not considered to be provided as the boiler will be designed with low NOx burnersand a stack of 275 m as per CPCB requirements shall be provided in line with the MOEF guidelines,which will help dispersion of air borne emissions over larger area and thus reducing the impact ofthe power plant on ground level concentrations.

On the basis of raw water quality available, clariflocculation, filtration, and demineralization plantswould be required and the treatment plants would be accordingly designed permitting adequateredundancy as well as storage capacities for different qualities of treated water.

It is proposed to collect 100% bottom ash and fly ash in dry form which is proposed to be utilized forindustrial purposes as per MoEF guidelines. Ample opportunities for ash use tie-up with prospective

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users/off-takers exist and the same are proposed to be finalized during construction phase of theproject. The responsibility for transportation of ash from plant area lies with the entrepreneur/off-taker of ash. Provision for transportation of ash by railway wagons and road tankers has been keptin the layout. During emergency only, ash may be sent to the ash dyke with a provision for storageof ash up to 15mt. level as per CEA norms. A plot of land measuring 160 Ha, outside the allocatedplot has been selected for ash dyke with a storage of 3 to 9 years ash generation as per CEArecommendations, to cater for any exigencies.

Schematic representations of the feasibility drawing which give information of EIA purpose.

The following shows the schematic for B1 / B2 projects and not for category A project

As per the EIA notification dated 14th September, 2006, it is mandatory for the proposed activity toget Environmental clearance before setting up or expansion /modernization. The detailed chartdelineating the process is given below

Process of Environmental Clearance Procedure

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Environmental Impact Assessment (EIA) is a well planned process to predict the environmentalconsequences of any kind of development, which is a result of human activities and to suggestappropriate measures in order to reduce adverse effects and also to augment positive effects. TheEIA procures a rational and ethical approach for sustainable development. However, it is morescientific process because it not only tells the past, present and the future consequences of goingon development, but also predicts the future events which likely to change due to some reasons, Interms of the EIA notification of the MoEF dated 14th September 2006, the generic structure of EIA Documents shall be as under:-

Introduction Project Description Description of the Environment Analysis of Alternatives (Technology & Site) Anticipated Environmental Impact & mitigation Measures Environmental Monitoring Program Additional studies Project benefits Environmental Cost benefits Analysis EMP Summary & Conclusion Disclosure of Consultant Engaged

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4. Site Analysis

Connectivity

State Expressway - 2 lane from Rajkot to Okha, 6 lane from Ahmedabad to Rajkot.

General:

Road: State Expressway - 2 lane from Rajkot to Okha, 6 lane from Ahmedabad to Rajkot.

Rail: Okha Railway station is at a distance of 17 km from the proposed project site.

Air: Jamnagar airport is at a distance of 112 km from the proposed project site.

Port: Okha port is 20 km from the project site.

Land Form, Land use and Land ownership.

Land for the project has been identified and land has been allocated to GSECL for setting up ofproposed project. Land use and ownership is government owned land. No displacement of localpopulation is foreseen, as the proposed land is uninhabited & non-agricultural. Hence, no R & Rissue is involved.

This being a virgin land, no demolition is anticipated. The ground is reasonably level. However,quantum of land fill for raising ground level can be ascertained after the Site Topographical Surveyreport is available. The land is practically leveled, however average elevation difference of variouspoints (as per attached contour survey map - considering 100 as a Temporary Bench Mark (TBM))is about 2-3 Meters. Preliminarily the elevation of the project site is about 4-5 Meters above MSL.No signs of sea water ingress in to this plot area were found. There is small pond in the middle ofthe plot which shall be filled up to the designed level. On an average, about 2 Meters ofcutting/filling of the existing land shall be required to develop the land up to designed level.

Staff housing Colony may be provided in the State Highway offset land area after obtainingnecessary clearance. Alternately, suitable land considering staff set up for O&M of the plant may beacquired by GSECL separately. As per CEA recommendations, 14 hectare of land is required.However, land requirements can be decided at engineering stage depending upon the staffstrength, type of housing (single storey or multi-storey flat type) etc. Estimated cost of housing for600 dwellings has been estimated at Rs.300 crore.

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Topography (along with map).

Existing land use pattern (agriculture, non-agriculture, forest, water bodies (including areaunder CRZ)), shortest distances from the periphery of the project to periphery of the forests,national park, wild lifesanctuary, eco sensitive areas, water bodies (distance from the HFL ofthe river), CRZ. In case of notified industrial area, a copy of the Gazette notification shouldbe given.

The total land available is 210 ha. There is no forest, National park, wild life sanctuary, eco sensitiveareas within 10 km radius of study area. However, marine sanctuary is at a distance of 8.0 km fromthe project site. The Arabian sea is at a distance of 0.5 km from the project site. There are no riversin 10 km of the study area of the project site. Its western boundary is on the shore of Arabian sea.

Existing Infrastructure.

Location:

Industry: TATA Chemicals industry is at a distance of 7.5 km from the proposed project site.

Soil classification

The land is shallow medium black soil. The land is practically levelled, however average elevationdifference of various points is about 2-3 meters. Requirements of piling is anticipated but can beascertained after the soil investigation report is available. Site topographical survey as well as soilinvestigation shall be carried out before start of engineering design. Looking to site location incoastal and extreme adverse marine conditions, proper care / precautions for designing Civil &structures works shall be taken to avoid deterioration and consequential impact on running of theplant.

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Climatic data from secondary sources.

The winters are mild, pleasant, and dry with average daytime temperatures around 29°C and nightsaround 12°C with 100 percent sunny days and clear nights. The summers are extremely hot anddry with daytime temperatures around 49°C and at night no lower than 30°C. In the weeks leadingup to the arrival of the monsoon rains the temperatures are similar to above but with high humiditywhich makes the air feel hotter. Relief comes when the monsoon season starts around in mid-June.The day temperatures are lowered to around 35°C but humidity is very high and nights are around27°C. Most of the rainfall occurs in this season, and the rain can cause severe floods. The sun isoften occluded during the monsoon season. Though mostly dry, it is desertic in the north-west, andwet in the southern districts due to a heavy monsoon season.

Social Infrastructure available.

While Gujarat’s health infrastructure at the local level is quite sufficient and up to the mark, whatbogs the present state of affairs is a terrible shortage of human resource input. The report, put outby the Statistics Division of the Ministry of Health and Family Welfare, Government of India, and ispart of the Centre’s National Rural Health Mission, has found that there is utter shortage of staff notonly at the lower level but also at the higher level, especially specialists, in both community healthcentres (CHCs) and primary health centres (PHCs).

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5. Planning in Brief (i) Planning Concept (type of industries, facilities, transportation etc) Town andCountry Planning / Development authority Classification.

The capacity addition programme proposed during 11th plan, ended March 2012, is 78,577 MW.The working Group on power has recommended a plan size of 82,200MW for 12th plan also.

It is seen from the projections prepared by the Planning Commission and CEA that there exists alarge gap between generation and demand in power now and that the gap will be a sustained oneover the next five years and would keep only growing over the next 25 years. The governmentinvestments alone would not be able to bridge this gap and the situation offers an opportunity forinvestment by private entities.

It is seen from the foregoing that there exists a demand for installation of additional generatingcapacity urgently. Also the demand for large amount of power supply will exist since the governmentalone cannot meet the planned addition to the generation capacity and this scenario will continue ina sustained manner for a long time in the Country in general. Hence the time is conducive forprivate sector to actively participate in the power generation and sustained growth of the country.

As the construction process are very much dependent on raw materials, it is required to have properinfrastructure for connectivity. The proposed site is connected through road and rail network.Availability of other utilities i.e. water, power etc in this area makes this site more suitable for theproposed project.

(ii) Population Projection

The area surrounding the plant site is having 14 no. of villages in 10-km radius. The total populationin the 10-km radius is 36004. The influx of population may further increase lively hood associatedactivities in the project nearby area.

(iii) Land use planning (breakup along with green belt etc).

The total main plant area for the proposed project is 210 ha. The Plant layout has been developedconsidering the optimum use of the land available, wind rose pattern of the area, direction of supplyof inputs like water and gas and operational ease.

The Break-up of the plant area is provided in the following table.

Land Requirement for 2x800 MW Coal Based Thermal Power Plant

Sl. No. Description Area (Ha)I Main Plant Area

1 Boiler & Auxiliaries 102 Turbine Generator set & it's auxiliaries 5

3Conventional (Outdoor) Switchyard / GI Switchyard

5

4a Railway siding 304b Coal handling and storage 505 Water treatment plant 30

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6 Area for rain water harvesting 107 Green Belt 70

Total 210II Off-site facilities

Ash Dyke 160 Colony 14

(iv) Assessment of Infrastructure Demand (Physical & Social).

On Assessment of Infrastructure Demand near the project area, following are the fewrequirements for the nearby villages of project area.

Colleges with ITI / Vocational Training institutions, (nearby available).

Hospitals / Primary Healthcare centers with Ambulance facility, (-- do-)

Fire stations, (Own as well as nearby available)

Community halls etc., (--do--)

Amenities/Facilities. (--do--)

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6. Proposed Infrastructure

Industrial Area (Processing Area).

The area will be used for construction and development of power plant. The infrastructure facilitieslike main plant building, make-up water system, DM plant, CW system etc.

Residential Area (Non Processing Area)

Staff housing Colony may be provided in the State Highway offset land area after obtainingnecessary clearance. Alternately, suitable land considering staff set up for O&M of the plant may beacquired by GSECL separately. About 14 hectare of land is proposed to be acquired. However,land requirements can be decided at engineering stage depending upon the staff strength, type ofhousing (single storey or multi-storey flat type) etc. Estimated cost of housing for 600 dwellings hasbeen estimated at Rs.300 crore.

Green Belt

As per the Guidelines of State Pollution Control board (SPCB) and Ministry of Environment &forests (MoEF), adequate green belt shall be developed in and around the plant area which willfulfill the requirement with a minimum area of 33% of the total Area.

Social Infrastructure

In association with the neighbouring industrial community as a corporate responsibility socialinfrastructure will be developed in the project study area. This development will be in associationwith the local bodies and village people.

On Assessment of Infrastructure Demand near the project area, following are the few requirementsfor nearby villages of project area.

Schools/training institutions

Hospitals / Primary Healthcare centers with Ambulance facility,

Fire stations,

Community halls etc.,

(v) Connectivity (Traffic and Transportation Road/ Rail/Metro/Water ways etc)

State Expressway - 2 lane from Rajkot to Okha, 6 lane from Ahmedabad to Rajkot.

Road: State Expressway - 2 lane from Rajkot to Okha, 6 lane from Ahmedabad to Rajkot.

Rail: Okha Railway station is at a distance of 17 km from the proposed project site.

Air: Jamnagar airport is at a distance of 112 km from the proposed project site.

Port: Okha port is 20 km from the project site.

(vi) Drinking Water Management (Source & Supply of water)

The proposed water demand is met from Proposed De-salination plant.

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Industrial Waste Management.

Sewage systemThe sewage wastewater will be treated in the Sewage Treatment Plant (STP) and treatedwaste water will be used for green belt development.

NITROGEN OXIDES (NOx)

DeNOx /SCR is not considered to be provided as the boiler will be designed with low NOx burners and a stack of 275 m as per CPCB requirements shall be provided.

WATER TREATMENT PLANT

On the basis of raw water quality available, clariflocculation, filtration, and demineralizationplants is proposed and the treatment plants would be accordingly designed permittingadequate redundancy as well as storage capacities for different qualities of treated water.

STEAM GENERATOR BLOWDOWN

The salient characteristics of the blowdown water from the point of view of pollution are thepH and temperature of water since suspended solids are negligible. The pH would be in therange of 9.5 to 10.3 and the temperature of the blowdown water would be about 100C sinceit is first flashed in an atmospheric flash tank.

COOLING WATER BLOWDOWN

Open circuit cooling water system with cooling towers is proposed. Arabian sea water isproposed for condenser cooling make up water and for miscellaneous usages.

NOISE POLLUTION

Indian standard for noise level specifies the limiting value of an overall noise level for aspecified area. However, OHSAS standard calls for regulations of noise level around thenoise emitting equipment.

All equipment in the proposed power plant would be designed / operated to have a noiselevel not exceeding 85 to 90 dB(A) in line with the requirements ofOHSAS. In addition, itwould be ensured that in the surrounding area, the noise level does not exceed 75 dB(A) indaytime and 70 dB(A) in night time to meet the Indian Standard regulations.

All the steam safety valves which are likely to be operated often would be provided withsilencers to reduce the noise level during steam release.

Solid Waste Management.

Ash is generated as solid waste from coal based power plant. The Ash handling system shallbe designed with separate schemes for bottom / coarse ash and for fly ash handling with100% dry system for both. It is proposed to collect 100% bottom ash and fly ash in dry formwhich will be utilized for industrial purposes like brick manufacture, additives in cement, landfilling etc. As per calculation, the total ash generated is about 9520 T/day on the basis of44.85% ash content in coal (worst coal). Out of this, bottom ash generation (expected) shallbe 1904 T/day & Fly ash 7616 T/day. Prospective users of bottom and flyash shall be

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contacted for removal of ash from power plant area in line with MoEF stipulations for whichtie ups with prospective users shall be finalized during Project execution.

For each unit, bottom ash shall be evacuated on continuous basis using dry Bottom AshEvacuation system with dry scrapper chain conveyor having a design capacity of about 45TPH. This bottom ash shall pass through an intermediate SILO of 100 T (>2 hours) capacitythrough a suitably sized crusher whose output is tuned to (-) 10mm. The same will beconveyed to a 720 T capacity silo at 45 TPH by pneumatic conveying. The ash inside thebottom ash silo having a minimum of 16 hours storage will be evacuated by train rakesthrough telescopic sprouts. Evacuation of bottom/fly ash through road tankers shall also beprovided, if considered feasible, during detailed engineering.

The Fly ash from ESP hoppers, APH hoppers, economiser hoppers & duct hoppers shall be evacuated every six hours in a shift of eight hours using pneumatic conveying system to fivenumbers of fly ash silos of 1500 T capacity each, (24 hours storage) located in the railwayyard with provision to load the wagons at a maximum rate of one rake per shift. Due to highquantity of ash generation, evacuation through road tankers is not considered practice. Thesolid waste from WTP/ETP will be disposed as per the norms stipulated byMoEF/CPCB/SPCB.

Power Evacuation & Supply / source.

The evacuation will be at 400 kV (or at suitable voltage decided by STU and shall be suitablytaken care in detailed power evacuation scheme) to the nearest proposed substation. Atabout 50 kms away from the project site, a 400 kV Bhogat substation is proposed by STU(Gujarat Energy Transmission corporation Limited (GETCO)). Rehabilitation And Resettlement (R&R) Plan

Policy to be adopted (Central/State) in respect of the project affected personsincluding home outstees, land outstees; and landless labourers (a brief outline to begiven)

Land for the project has been identified and land acquisition is in progress. No majordisplacement and rehabilitation of local population is foreseen, as the proposed land isuninhabited & non-agricultural. Hence no R & R issue is involved.

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7. Project Schedule & Cost Estimates

Likely date of start of construction and likely date of completion (Time schedule forthe project to be given).

7.1 Project Implementation

For implementing this project within the desired time and cost schedules, it is essential toundertake meticulous planning, right from the conceptual stages. Following aspects of theproject implementation will be crucial:

Effecting timely project development activities, including securing various approvals / NoC’s /permissions for each component of the integrated project.

Selection of a prospective developer simultaneously along with approvals.

Approaching select FIs / bankers, rendering required follow up and achieving financialclosure, through raising of required equity and providing necessary securities.

Finalization of mode of project implementation (EPC mode and O&M contracts for individualproject components), along with experienced owner engineering / consultancy team foreffective monitoring of the implementation / commissioning of each component as per theschedule, is recommended. GSECL proposes to appoint experienced project engineeringmanagement consultancy firm, as well as experienced in-house project team for thepurpose.

Manpower and resource mobilization at required time and effectively

7.2 Project Schedule

The zero date of the project starts from the date of achieving financial closure. The thermalpower plant project implementation will be completed within 48 months.

The major activities to be carried out after the financial closure will include

i. Detailed design engineering and specificationsii. Preparation of EPC / package bid cum, bidding, bid evaluation, recommendations

and contracting for civil, mechanical, electrical and instrumentation components aswell as Kick off meetings with individual vendors / contractors.

iii. Vendor drawing review and approvals, inspection and expediting and delivery at siteiv. Engineering services for wrap around of all packages.v. Site supervision for erection, testing & commissioning vi. Bidding, contracting and signing of O&M contractsvii. Plant stabilization and development of MIS

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8. Estimated project cost along with analysis in terms of economic viability of theproject.

Estimate Of Project Cost

The proposed plant capacity would be 2x800 MW. The total estimated cost of the projectworks out to Rs. 11108.24 Crores (approx)

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9. Analysis of Proposal (Final Recommendations)

9.1 Financial and social benefits with special emphasis on the benefit to the local people including tribal population if any, in the area:

The plant is configured with 2 steam generators of 800 MW capacity each and theirauxiliaries, two steam turbine & generator sets of 800 MW capacity each and other Balance ofPlant Equipment. Indigenous Coal is the main fuel for the unit with HFO- / LDO as the start-upfuel. The financial analysis is carried out based on the assumption that the plant will berunning with 90% availability and Plant Load Factor (PLF).

The basic target would be the development of the local villages in the vicinity of the project.Hence, tremendous scope for development of the local population economically is envisaged.As there is no tribal population in the vicinity, there may not be much contribution towards thedevelopment of the tribal population.

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