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The Draft Transmission Programmatic Environmental Impact Statement (EIS) was released on March 31, 2025. To review the document visit the Transmission PEIS webpage. 
There has been an extension to comment on the Draft PEIS until May 15th. 

The Carriger Solar Draft Order #899 is available for comment April 29th through May 1st 11:59 pm. You can see the Draft Order under the "Orders" header towards the bottom of the Carriger Solar webpage.  

There are two Special Meetings for the Carriger Solar project set for May 5th and May 6th. For more information, visit the Carriger Solar webpage. 

If you would like to submit a comment for either of the above visit our comment database: https://comments.efsec.wa.gov

Horse Heaven Application

Application Extension Request

The fourth Application Extension Request was approved by the Council at the January 31, 2024 EFSEC Council Meeting. The Extension ends April 30, 2024.

Application Extension Request

Document Title Document Date
Extension Request 01/07/2022
Extension Request 2 09/27/2022
Extension Request Submitted and Withdrawn 03/20/2023
Extension Request 3 06/12/2023
Extension Request 4 01/24/2024

Expedited process

Application

Appendix R istemporarily taken down for redactions and will be reuploaded as soon as possible. 

Application Original

Document Title Document Date
Original Application Cover Letter February 8, 2021 02/08/2021
Original Application Submitted February 8, 2021 02/08/2021
Appendix A - Decommissioning Plan 02/08/2021
Appendix B - Preliminary Geotech Report 02/08/2021
Appendix C - SEPA Checklist 02/08/2021
Appendix D - Preliminary County Zoning Determination 02/08/2021
Appendix E - Turbine and Acess Road Displacement Area 02/08/2021
Appendix F - Land Owner List and Legal Descriptions 02/08/2021
Appendix G - Shadow Flicker Analysis 02/08/2021
Appendix H - Glare Analysis Report 02/08/2021
Appendix I Wetlands Water Delination Report 02/08/2021
Appendix J Water Source Documentation 02/08/2021
Appendix K - REDACTED Biological Reports 02/08/2021
Appendix N - Revegetation and Noxious Weed Control Plan 02/08/2021
Appendix O - Acoustic Modeling Results by Noise Sensitive Receptor 02/08/2021
Appendix O additional information - Baseline Sound Survey 03/17/2021
Appendix P - Emergency Response Plan 02/08/2021
Appendix Q - Visual Simulation 02/08/2021
Appendix S - Economic Impact Assessment 02/08/2021
Appendix T - Notice for Intent for National Pollutant Discharge Elimination System (NPDES) 02/08/2021
Appendix U - Consultation Documents 02/08/2021
Appendix V - TLG Transportation Study 02/08/2021

Updated and Supplemental Reports to the ASC

Document Title Document Date
Appendix O Acoustic Model Sound Source Input Data November 2021 11/24/2021
Appendix O Figure 4.1.1-2 Operational Recieved Sound Levels November 23, 2021 11/23/2021
Appendix O Figure 4.1.1-3 Operational Recieved Sound Levels November 23, 2021 11/23/2021
Appendix O Figure 4.1.1-4 Operational Recieved Sound Levels November 23, 2021 11/23/2021
Appendix O Figure 4.1.1-5 Operational Recieved Sound Levels November 23,2021 11/23/2021
Appendix O: Acoustic Modeling Results by Noise Sensitive Receptor Update November 02, 2021 11/02/2021
2021 Botany and Habitat Survey Report – August 2021 09/10/2021
Appendix I Wetland Amendment: Wetlands and Other Waters Delineation August 12, 2021 08/12/2021
Appendix I Wetland Report Photos: Wetlands and Other Waters Delineation August 12, 2021 08/12/2021

Updated HH ASC June 2022

Document Title Document Date
Updated ASC Cover Letter June 15, 2022 06/15/2022
Updated Application for Site Certification (ASC) Change Log 06/15/2022
Updated ASC Appendix A - Decommissioning Plan 06/15/2022
Updated ASC Appendix B - Preliminary Geotech Report 06/15/2022
Updated ASC Appendix C - SEPA Checklist 06/15/2022
Updated ASC Appendix D - Planning Determination 06/15/2022
Updated ASC Appendix E - Turbine and Access Road Displacement Area 06/15/2022
Updated ASC Appendix F - Land Owner List and Legal Descriptions 06/15/2022
Updated ASC Appendix G - Shadow Flicker Analysis 06/15/2022
Updated ASC Appendix H - Glare Analysis Report 06/15/2022
Updated ASC Appendix I - Wetlands Water Delineation Report 06/15/2022
Updated ASC Appendix J - Water Source Documentation 06/15/2022
Updated ASC Appendix K - REDACTED Biological Reports (Revised) 06/15/2022
Updated ASC Appendix K - REDACTED Biological Reports (Revised) Redline 06/15/2022
Updated ASC Appendix M - Bird and Bat Conservation Strategy 06/15/2022
Updated ASC Appendix N - Revegetation and Noxious Weed Control Plan 06/15/2022
Updated ASC Appendix O - Acoustic Modeling Results by Noise Sensitive Receptor 06/15/2022
Updated ASC Appendix P - Emergency Response Plan 06/15/2022
Updated ASC Appendix Q - Visual Simulation 06/15/2022
Updated ASC Appendix S - Economic Impact Assessment 06/15/2022
Updated ASC Appendix T - Notice for Intent for National Pollutant Discharge Elimination System (NPDES) 06/15/2022
Updated ASC Appendix U - Consultation Documents 06/15/2022
Updated ASC Appendix V - TLG Transportation Study 06/15/2022

Updated ASC

Document Title Document Date
Cumulative Effects to Birds, Bats, and Land Cover from Renewable Energy Development in the Columbia Plateau Ecoregion of Eastern Oregon and Washington 01/09/2023
Updated Application for Site Certification (ASC) 12/29/2022
Updated ASC Appendix A - Decommissioning Plan 12/29/2022
Updated ASC Appendix B - Preliminary Geotech Report 12/29/2022
Updated ASC Appendix C - SEPA Checklist 12/29/2022
Updated ASC Appendix D - Planning Determination 12/29/2022
Updated ASC Appendix E - Turbine and Access Road Displacement Area 12/29/2022
Updated ASC Appendix F - Land Owner List and Legal Descriptions 12/29/2022
Updated ASC Appendix G - Shadow Flicker Analysis 12/29/2022
Updated ASC Appendix H - Glare Analysis Report 12/29/2022
Updated ASC Appendix I - Wetlands Water Delineation Report 12/29/2022
Updated ASC Appendix J - Water Source Documentation 12/29/2022
Updated Appendix K - REDACTED Biological Reports (Revised) 12/29/2022
Updated ASC Appendix L - Habitat Mitigation Plan 12/29/2022
Updated ASC Appendix M - Bird and Bat Conservation Strategy 12/29/2022
Updated ASC Appendix N - Revegetation and Noxious Weed Control Plan 12/29/2022
Updated ASC Appendix O - Acoustic Modeling Results by Noise Sensitive Receptor 12/29/2022
Updated ASC Appendix P - Emergency Response Plan 12/29/2022
Updated ASC Appendix Q - Visual Simulation 12/29/2022
Updated ASC Appendix S - Economic Impact Assessment 12/29/2022
Updated ASC Appendix T - Notice for Intent for National Pollutant Discharge Elimination System (NPDES) 12/29/2022
Updated ASC Appendix U - Consultation Documents 12/29/2022
Updated ASC Appendix V - TLG Transportation Study 12/29/2022
Population Viability Analysis of Ferruginous Hawk (Buteo regalis) in Eastern Washington 11/14/2022
Multi-scale Resource Selection of Ferruginous Hawk (Buteo regalis) Nesting in Eastern Washington and at the Horse Heaven Clean Energy Center, Benton County, Washington 09/23/2022

Updated ASC Redline

Document Title Document Date
Updated Application for Site Certification (ASC) Redline 12/01/2022
Updated ASC Redline Appendix A - Decommissioning Plan 12/01/2022
Updated ASC Redline Appendix B - Preliminary Geotech Report 12/01/2022
Updated ASC Redline Appendix C - SEPA Checklist 12/01/2022
Updated ASC Redline Appendix D - Planning Determination 12/01/2022
Updated ASC Redline Appendix E - Turbine and Access Road Displacement Area 12/01/2022
Updated ASC Redline Appendix F - Land Owner List and Legal Descriptions 12/01/2022
Updated ASC Redline Appendix G - Shadow Flicker Analysis 12/01/2022
Updated ASC Redline Appendix H - Glare Analysis Report 12/01/2022
Updated ASC Redline Appendix I - Wetlands Water Delineation Report 12/01/2022
Updated ASC Redline Appendix J - Water Source Documentation 12/01/2022
Updated ASC Redline Appendix K - Biological Reports (Revised) Redline 12/01/2022
Updated ASC Redline Appendix N - Revegetation and Noxious Weed Control Plan 12/01/2022
Updated ASC Redline Appendix O - Acoustic Modeling Results by Noise Sensitive Receptor 12/01/2022
Updated ASC Redline Appendix P - Emergency Response Plan 12/01/2022
Updated ASC Redline Appendix Q - Visual Simulation 12/01/2022
Updated ASC Redline Appendix S - Economic Impact Assessment 12/01/2022
Updated ASC Redline Appendix T - Notice for Intent for National Pollutant Discharge Elimination System (NPDES) 12/01/2022
Updated ASC Redline Appendix Appendix U - Consultation Documents 12/01/2022
Updated ASC Redline Appendix Appendix V - TLG Transportation Study 12/01/2022

Note: Some files are large and may take a long time to download.

NOTE: Missing appendices will be uploaded when redactions are complete.

Final ASC

Document Title Document Date
Cover Letter 09/25/2023
Final ASC 09/25/2023
Final ASC - Redline (Redacted) 09/25/2023
Appendix A - Decommissioning Plan 09/25/2023
Appendix B - Preliminary Geotechnical Investigation Report 09/25/2023
Appendix C - SEPA checklist 09/25/2023
Appendix D - County Zoning Determination 09/25/2023
Appendix E - Turbine and Access Road Displacement 09/25/2023
Appendix F - Project Lease Boundary Landowner List with Legal Descriptions 09/25/2023
Appendix G - Shadow Flicker Analysis Memo (Revised) 09/25/2023
Appendix H - Glare Analysis Report 09/25/2023
Appendix I - Wetland and Other Waters Delineation Report (Revised Aug 2021) 09/25/2023
Appendix J - Water Source Documentation 09/25/2023
Appendix K - REDACTED Biological Reports (Revised) 09/25/2023
Appendix L - Draft Wildlife Habitat Mitigation Plan (Redacted) 09/25/2023
Appendix L - Draft Wildlife Habitat Mitigation Plan - Redline (Redacted) 09/25/2023
Appendix M -Bird and Bat Conservation Strategy (Redacted) 09/25/2023
Appendix N - Revegetation and Noxious Weed Control Plan 09/25/2023
Appendix O - Acoustics Reports 09/25/2023
Appendix P - Draft Emergency Response Plan (Revised) 09/25/2023
Appendix P - Draft Emergency Response Plan (Revised) Redline 09/25/2023
Appendix Q - Visual Simulations (Revised) 09/25/2023
Appendix Q - Visual Simulations (Revised) Redline 09/25/2023
Appendix S - Economic Impact Study 09/25/2023
Appendix T - Notice of Intent for NPDES Permit 09/25/2023
Appendix U - Consultation 09/25/2023
Appendix V - TLG Transportation Study 09/25/2023
Appendix W - Air Quality Dispersion Modeling Evaluation (New) 09/25/2023
Appendix W - Air Quality Dispersion Modeling Evaluation (New) - Redline 09/25/2023
Appendix X - Traffic Impact Analysis 09/25/2023
Appendix X - Traffic Impact Analysis - Redline 09/25/2023
Change Log 09/25/2023

Sept 2023 Layout Changes

Document Title Document Date
Layout Option 1 09/25/2023
Layout Option 2 09/25/2023
Scout Clean Energy Letter - Project Update Responding to Adjudication Concerns 09/25/2023

Activities

Federal Activities

Document Title Document Date
Department of Defense (DoD) Agreement 11/10/2020
Department of Defense (DoD) Agreement Amended 01/20/2023
Department of Defense (DoD) Agreement Map 05/03/2021

Copies of the Horse Heaven application can be found at:

Hard Copy:

Energy Facility Site Evaluation Council
621 Woodland Square Loop SW
Lacey, WA, 98504-3172
360-664-1345

Flash Drive:

Mid-Columbia Libraries
Kennewick Branch
1620 S Union Street
Kennewick, WA 99338
(509) 783-7878

Mid-Columbia Libraries
Prosser Branch
902 7th Street
Prosser, WA 99350
(509) 786-2533

Mid-Columbia Libraries
Benton City Branch*
810 Home Dr.
Benton City, WA 99320
(509) 588-6471

Mid-Columbia Libraries
Keewaydin Park Branch
405 S Dayton Street
Kennewick, WA 99336
(509) 586-3156

Mid-Columbia Libraries
West Pasco Branch
7525 Wrigley Drive
Pasco, WA 99301
(509) 546-8055

Richland Public Library
955 Northgate Drive
Richland, WA 99352
(509) 942-7454

Mid-Columbia Libraries
Pasco Branch
1320 W Hopkins Street
Pasco, WA 99301
(509) 545-1019

Mid-Columbia Libraries
West Richland Branch*
3803 W Van Giesen Street
West Richland, WA 99353
(509) 967-3191

Washington State Library
Point Plaza East
6880 Capitol Boulevard SE
Tumwater, WA 98501
(360) 704-5200

*Libraries added for the Final ASC.