precast braced foundation - indian wind turbine · capex reduction thanks to boq savings precast...
TRANSCRIPT
PRECAST BRACED FOUNDATION
TOWARDS A SIGNIFICANT CoE REDUCTION FROM THE VERY BASE
Ramón López Mendizabal
CONTENT
1. CONTEXT. WIND ENERGY SECTOR NOWADAYS
2. PRECAST BRACED FOUNDATION
2.1 BRIEF EXPLANATION OF THE CONCEPT
2.2 ADVANTAGES: CoE REDUCTION
2.3 CONSTRUCTION STAGES
2.4 TRACK RECORD
2.5 CERTIFICATION
3. CONCLUSIONS
CONTENT
1. CONTEXT. WIND ENERGY SECTOR NOWADAYS
2. PRECAST BRACED FOUNDATION
2.1 BRIEF EXPLANATION OF THE CONCEPT
2.2 ADVANTAGES: CoE REDUCTION
2.3 CONSTRUCTION STAGES
2.4 TRACK RECORD
2.5 CERTIFICATION
3. CONCLUSIONS
Wind Energy sector nowadays
Turbulent and difficult times
Wind Energy sector nowadays
Auction system has arrived…
…And has come to stay
Wind Energy sector nowadays
If you have the permits and are good enough IN
Up to now: FIT System From now on: AUCTION System
If you are not the best OUT
Wind Energy sector nowadays
Source: IRENA,
2017
Auctions are driving prices down worldwide... and India is not now an exception
Source: The Hindu Business Line,
February 2017
Wind Energy sector nowadays
Fierce competition
Different Wind Technologies
Wind Energy sector nowadays
Fierce competition:
Different Wind Technologies
Different energy sources
Wind Energy sector nowadays
Auctions means competition and it is known that in competition every detail may be decissive
Even the foundation
Wind Energy sector nowadays
WTG foundations hve not been an innovation paradigm in the recent past
CONTENT
1. CONTEXT. WIND ENERGY SECTOR NOWADAYS
2. PRECAST BRACED FOUNDATION
2.1 BRIEF EXPLANATION OF THE CONCEPT
2.2 ADVANTAGES: CoE REDUCTION
2.3 CONSTRUCTION STAGES
2.4 TRACK RECORD
2.5 CERTIFICATION
3. CONCLUSIONS
Brief explanation of the concept
General geometry and components HH increases up to +5m
Advantages: Cost of Energy reduction
Reduction of the Cost of Energy CoE
Increasing the energy production (↑AEP), thanks to the HH increase (up to +6m)
Putting down the foundation execution cost (↓CAPEX)
Main advantage: Cost of Energy reduction
AEP increase thanks to higher HH
India: Low winds & significantly high shear factors
D 5m HH 1 - 3% D AEP
D 2% AEP 2% Tariff reduction
Tariff reduction: 70 ₹/ MWh (1.08 USD / MWh)
Equivalent to a CAPEX reduction of 15 Lakhs/MW
Main advantage: Cost of Energy reduction
CAPEX reduction thanks to BoQ savings
Precast braced foundation 30 to 40% savings in concrete and Steelcompared to a traditional solution
Overall the cost of the precast braced foundation is 15 to 20% less than thetraditional foundation solution
CAPEX reduction of 80 Lakhs x 0,15 = 12 Lakhs/turbine or 5 Lakhs/MW
Tariff reduction: 20 ₹/ MWh (0.30 USD / MWh)
Topping that, if slightly modifying the tower, avoiding the access door and insteadentering the tower through the foundation:
CAPEX Savings: 2 Lakhs/MW
Tariff reduction: 7 ₹/ MWh (0.11 USD / MWh)
Main advantage: Cost of Energy reduction
All this achieved without any need of changing neither the turbine manufacturer, nor the tower nor the certification nor the location of the wind farm!
Total tariff reduction ≈ 100 ₹/ MWh = 0,1 ₹/ KWh (1,54 USD / MWh)
Stage 0: Precast braced concrete manufacturing and stocking
Construction stages
Construction stages
Stage 1: Excavation and blind concrete casting
Stage 2: Lower slab steel arrangement and pedestal formwork positioning
Construction stages
Stage 2: Lower slab steel arrangement and pedestal formwork setting
Construction stages
Construction stages
Stage 3: Brace positioning and lower slab casting
Construction stages
Stage 4: Central ring steel arrangement, formwork setting and casting
Stage 5: Upper slab steel arrangement, formwork setting and casting + backfilling
Construction stages
Stage 6: Postensioning
Construction stages
Precast braced foundation track record
WIND FARM COUNTRY WIND TURBINE GENERATOR YEAR NUMBER
BANZI ITALY Gamesa G97-2MW HH90m 2015 15
KAYATHAR INDIA Gamesa G97-2MW HH100+4m 2016 3
SAN JACINTO MEXICO Gamesa G97-2MW HH80+4m 2016-2017 10
PARRAS MEXICOGeneral Electric GE2.5-116m-2.5MW
HH87+5m2017 80
GUINAA SICARU MEXICOGamesa G114-2.65MW HH80/93+5/5m
2017 115
TIZIMIN MEXICO Gamesa G114-2.5MW HH115+4m 2017 34
TOTAL 257
Certified foundation: DNV-GL & TÜV Sud
CONTENT
1. CONTEXT. WIND ENERGY SECTOR NOWADAYS
2. PRECAST BRACED FOUNDATION
2.1 BRIEF EXPLANATION OF THE CONCEPT
2.2 ADVANTAGES: CoE REDUCTION
2.3 CONSTRUCTION STAGES
2.4 TRACK RECORD
2.5 CERTIFICATION
3. CONCLUSIONS
Conclusions
Under current market scenario every detail may be decissive
Precast braced foundation as an effective way of putting down the CoE
Very appropiate for countries as India, where cheap labour is available compared to material cost
Reducing easily 0.10 ₹/ Kwh
Reliable and tested solution already on the comercial deployment
Ready to be used again in WWFF all around India