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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 Wind Farm

Horse Heaven Wind Farm - Horse Heaven Wind Farm - Docket:210011

Process Type Document Group(s) Document link File Date Document Set
SEPA Draft EIS
Table of Contents 12/16/2022
SEPA Draft EIS
Chapter 9 - Distribution 12/16/2022
SEPA Draft EIS
Chapter 3 - Affected Environment 12/16/2022
SEPA Draft EIS
Appendix 3.10-2 SWCA 2022 Visual Impact Assessment Report 12/16/2022
SEPA Draft EIS
FECHA DE PUBLICACIÓN DECLARACIÓN PRELIMINAR DE IMPACTO AMBIENTAL 12/22/2022
SEPA Draft EIS
HOJA INFORMATIVA 12/22/2022
SEPA Draft EIS
Complete DRAFT EIS Document 12/16/2022 001
SEPA Final EIS
Final EIS - FULL DOCUMENT 10/31/2023 FEIS
SEPA Final EIS
Appendix 4.11-1 Noise Modeling Assessment - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Appendix 4.16-1 Economic Impact Analysis Methodology - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Appendix 10-1 Comments and Responses on Draft EIS - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Ch.1 Project Background - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Ch.2 Proposed Action and Alternatives - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Ch.3 Affected Environment - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Ch.4 Analysis of Potential Impacts - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Ch.5 Cumulative Impacts - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Ch.6 References - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Ch.7 List of Preparers - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Ch.8 Glossary - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Ch.9 Distribution - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Ch.10 Comments & Responses on Draft EIS - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Appendix 3.5-1 Habitat Photos - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Appendix 3.8-1 LSU Consistency Analysis - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Appendix 3.10-1 Sky Glow Comparisons - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Appendix 3.10-2 Updated SWCA Visual Study - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Appendix 3.16-1 Proximity to Environmental Stressors - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Appendix 4.3-1 Air Quality Emission Calculations - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Appendix 4.3-2 Tetra Tech 2023 Air Quality Dispersion Modeling Evaluation - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Appendix 4.6-1 Wildlife Collision Study - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Appendix 4.6-1 Wildlife Collision Study - Final EIS 10/31/2023 FEIS
SEPA Final EIS
Appendix 4.10-1 Glare Analysis Report - Final EIS 10/31/2023 FEIS
SEPA Letter
Cover Letter 12/16/2022
SEPA Letter
Data Request 1 letter 05/27/2021 00043
Data Request 1
SEPA Letter
Data Request 2 07/16/2021 00044
Data Request 2
SEPA Letter
Data Request 3 07/22/2021 00045
Data Request 3
SEPA Letter
Applicant letter regarding Determination of Significance 04/05/2021 00056
Applicant letter regarding Determination of Significance
SEPA Letter
Data Request 7 03/22/2023 001
SEPA Letter
Cover letter - Final EIS 10/31/2023 FEIS
SEPA Letter
Table of Contents - Final EIS 10/31/2023 FEIS
SEPA Letter
Title Page - Final EIS 10/31/2023 FEIS
SEPA Map
Data Request 2 Topographical Earth Maps 09/10/2021 00044
Data Request 2
SEPA Map
Figure X0.1-1 Turbine Layout Option 1 01/22/2024 FEIS
SEPA Map
Figure X0.1-2 Turbine Layout Option 2 01/22/2024 FEIS
SEPA Map
Council Exclusion Considerations 1 through 4 01/22/2024 FEIS
SEPA Map
Figure X0.2-1 Turbine Layout Option 1 01/22/2024 FEIS
SEPA Map
Figure X0.2-2 Turbine Layout Option 2 01/22/2024 FEIS
SEPA Map
Figure X0.3-1 Turbine Layout Option 1 01/22/2024 FEIS
SEPA Map
Figure X0.3-2 Turbine Layout Option 2 01/22/2024 FEIS
SEPA Map
Figure X0.4-1 Turbine Layout Option 1 01/22/2024 FEIS
SEPA Map
Figure X0.4-2 Turbine Layout Option 2 01/22/2024 FEIS

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