Deubrook Elementary School Gymnasium

Toronto, South Dakota

November 27th, 2017

Docket: EL 17-0421

ASTORIA STATION PUBLIC INPUT HEARING

• Bill Swanson, Manager, Supply Engineering• Astoria Station Project Manager

• Mark Thoma, Manager, Environmental Services• Astoria Station Permitting Manager

PRESENTERS

2

• HDR

• Air Permit and Site Permit Support

• Sargent & Lundy

• Preliminary Engineering

• First District Association of Local Governments

• Social & Economic Impact Study

• Banner Engineering

• Groundwater Evaluation

• Power Engineers

• Generation-Tie Line Design

CONSULTANTS SUPPORTING PROJECT

3

• Who we are

• Project need and location

• Project components and schedule

• Community impacts

• Environmental review

AGENDA

4

WHO WE ARE

5

WHO WE SERVE

• 70,000 Square Miles

• 131,551 Customers

• 422 Communities

• Avg. population ≈400

• 796 Employees

• 472 Minnesota

• 205 North Dakota

• 119 South Dakota

• About 800 MW owned

generation

6

80%

10%

9%

1%

53%

4%

31%

12%

59%

16%

24%

1%

2001 2011 2021

HOW WE CREATE ELECTRICITY

7

PROJECT NEED AND LOCATION

8

Astoria Station is a needed project for OTP. Three factors:

1. Hoot Lake Plant is retiring in May 2021.

• Hoot Lake is a 140 MW coal-fired facility in Fergus Falls, MN.

2. We have expiring capacity contracts in approximately the same timeframe.

3. We project future load growth.

PROJECT NEED & KEY HISTORY

9

ASTORIA, SD - LOCATION

10

Intersection of new 345 kV

transmission and major

natural gas pipeline is key to

SD site advantage

Northern Border

Natural Gas Line

Project Site near Astoria, SD

BSSB – Big Stone

South to

Brookings 345 kV

CAPX

PROJECT SITE OVERVIEW

11

N

28

311

OTP Property

Astoria

482nd Ave

345 kV Line

Existing Northern

Border Natural Gas

Pipeline

PROJECT COMPONENTS AND SCHEDULE

12

• Astoria Station will be an approximate 250 MW simple-cycle natural gas combustion turbine.

• The peaking plant will serve during periods of high demand or when other generating sources are not available.

• Cost ~$165M. We expect the station to be online in 2021.

ASTORIA STATION

13

• Resources Needed: Water, Air, Natural Gas

• Major Components:

• Inlet Air Filter

• Air Compressor Section

• Gas Combustion Chamber

• Power Turbine

• Electrical Generator

• Generator Step Up Transformer

SIMPLE CYCLE TURBINE

14

PLANT GENERAL ARRANGEMENT

Side View

45° Angle

View

15

• Less than ½ mile to interconnect to BSSB 345-kV transmission system

• 3-5 new structures

• OTP’s property connects to the preliminary location identified for the BSSB switching station

GEN-TIE LINE

16

• Will connect into the Northern Border Pipeline on Otter Tail property

• < 1,000’ pipe from meter station to turbine

• 10” diameter pipe

NATURAL GAS PIPING

17

OTP Property

Existing Northern

Border Pipeline

N

• Onsite well is proposed

• < 1,500’ long, 5” diameter pipe to storage tank

• Proposed capacity of 100 gpm

• Above ground 350,000 gallon storage tank

• There will be many days or months when process water is not required

WATER LINE

18

Well

OTP Property

Existing Northern

Border Pipeline482nd Ave

N

PROJECT SCHEDULE

19

COMMUNITY IMPACTS

20

Date Number of Workers Onsite

Ground Breaking and Month 1 20

Month 2 30

Month 3 30

Month 4 40

Month 5 50

Month 6 60

Month 7 60

Month 8 70

Month 9 70

Month 10 70

Month 11 60

Month 12 40

Month 13 30

CONSTRUCTION WORKFORCE

21

• Most likely heavy haul route will be East along Hwy 28 from I29 to 482nd

Ave.

• Road agreements and heavy haul permits will be reviewed with the Township/County.

• Necessary roadway improvements will be made to 482nd Ave.

TRANSPORTATION

22

• Astoria Station will pay property tax totaling approximately $3 million within the first five years of operation, then approximately $1 million each subsequent year.

• These tax payments will get distributed between the DeubrookSchool District, Deuel County, Scandinavia Township, and the Water and Fire District.

• Astoria Station will:

• Create construction jobs that equates to approximately $30 million in labor.

• Require three to five full-time employees to operate.

ECONOMIC IMPACTS

23

Representatives From:

• Deuel County Commission

• Brookings County Commission

• Deubrook School District 05-6

• Deuel School District 19-4

• Town of Astoria

• Town of Brandt

• Town of Toronto

• Otter Tail Power Company

LOCAL REVIEW COMMITTEE

24

Areas to Study:• Housing Supplies

• Educational Facilities and Manpower

• Water Supply and Distribution

• Wastewater Treatment and Collection

• Solid Waste Disposal and Collection

• Law Enforcement

• Transportation

• Fire Protection

• Health

• Recreation

• Government

• Energy

ENVIRONMENTAL REVIEW

25

ENVIRONMENTAL REVIEW

26

Impacts Studied Included:

• Aquatic Ecosystems: No wetland impacts are anticipated

• Cultural Resources: No historic properties on the site

• Terrestrial Ecosystems: No known threatened, endangered, or rare species

• Air Quality

• Water Quality

• Sound

0

0.5

1

1.5

2

2.5

3

3.5

4

Astoria Station Modern Coal Plant Regional Fossil Average

AIR QUALITY: SULFUR DIOXIDE (SO2) LBS/MWH

27

0

0.5

1

1.5

2

2.5

Astoria Station Modern Coal Plant Regional Fossil Average

AIR QUALITY: NITROGEN OXIDE (NOX) LBS/MWH

28

0

500

1000

1500

2000

2500

Astoria Station Modern Coal Plant Regional Fossil Average

AIR QUALITY: CARBON DIOXIDE (CO2) LBS/MWH

29

WATER QUALITY

30

Water Appropriation:

• Test well installed into the Altamont aquifer

• Well depth of 679 feet; reports on file with DENR for other wells within five miles are into shallower aquifers

Surface Water and Stormwater:

• Existing surface water drainage patterns will not be altered

• Stormwater from site operations will be directed into a stormwater retention pond

SOUND COMPARISONS

31

20

36

50

60 60

70

84

120

0

20

40

60

80

100

120

140

Whisper Rural NightSetting

Office Astoria Stationfrom 482nd

Ave

NormalConversation

PassengerCar

Tractor Jet Plane atTakeoff

dBA

Thank You!

For the latest Project information:

otpco.com/AstoriaStation