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Tri-State’s filings with the Security and Exchange Commission (SEC) are posted as PDFs below and are also available via the SEC's website.

  • 2022
  • 2021
  • 2020
  • 2019
  • 2018
  • 2017
  • 2016
  • 2015
Document Name Date/Timeframe Type Download
Form 10-K for the fiscal year ended December 31, 2022 PDF Download
Form 10-Q for the quarterly period ended September 30, 2022 PDF Download
Form 8-K dated July 27, 2022 PDF Download
Form 8-K dated July 27, 2022 PDF Download
Form 8-K dated July 13, 2022 PDF Download
Form 8-K dated July 5, 2022 PDF Download
Form 10-Q for the quarterly period ended June 30, 2022 PDF Download
Form 8-K dated May 31, 2022 PDF Download
Form 8-K dated May 16, 2022 PDF Download
Form 8-K dated April 25, 2022 PDF Download
Form 8-K dated April 18, 2022 PDF Download
Form 10-Q for the quarterly period ended March 31, 2022 PDF Download
Form 8-K dated January 11, 2022 PDF Download
Document Name Date/Timeframe Type Download
Form 10-K for the fiscal year ended December 31, 2021 PDF Download
Form 8-K dated December 20, 2021 PDF Download
Form 8-K dated August 30, 2021 PDF Download
Form 10-Q for the quarterly period ended September 30, 2021 PDF Download
Form 10-Q for the quarterly period ended June 30, 2021 PDF Download
Form 10-Q for the quarterly period ended March 31, 2021 PDF Download
Document Name Date/Timeframe Type Download
Form 10-K for the fiscal year ended December 31, 2020 PDF Download
Form 8-K dated October 13, 2020 PDF Download
Form 10-Q for the quarterly period ended September 30, 2020 PDF Download
Form 8-K dated September 16, 2020 PDF Download
Form 8-K dated August 13, 2020 PDF Download
Form 8-K dated July 27, 2020 PDF Download
Form 10-Q for the quarterly period ended June 30, 2020 PDF Download
Form 8-K dated June 29, 2020 PDF Download
Form 8-K dated June 24, 2020 PDF Download
Form 8-K dated May 21, 2020 PDF Download
Form 8-K dated April 22, 2020 PDF Download
Form 8-K dated April 10, 2020 PDF Download
Form 10-Q for the quarterly period ended March 31, 2020 PDF Download
Form 8-K dated March 24, 2020 PDF Download
Form 8-K dated January 30, 2020 PDF Download
Form 8-K dated January 23, 2020 PDF Download
Form 8-K dated January 8, 2020 PDF Download
Form 8-K dated January 3, 2020 PDF Download
Document Name Date/Timeframe Type Download
Form 10-K for the fiscal year ended Dec 31 2019 PDF Download
Form 8-K dated November 25, 2019 PDF Download
Form 10-Q for the quarterly period ended Sept 2019 PDF Download
Form 8-K dated September 24,2019 PDF Download
Form 8-K dated July 8, 2019 PDF Download
Form 10-Q for the quarterly period ended June 30 2019 PDF Download
Form 8-K dated June 17, 2019 PDF Download
Form 8-K dated April 17, 2019 PDF Download
Form 8-K dated April 3, 2019 PDF Download
Form 10-Q for the quarterly period ended March 31 2019 PDF Download
Form 8-K dated March 22, 2019 PDF Download
Form 8-K dated February 12, 2019 PDF Download
Document Name Date/Timeframe Type Download
Form 10-K for the fiscal year ended Dec 31 2018 PDF Download
Form 10-Q for the quarterly period ended Sept 30 2018 PDF Download
Form 8-K dated September 20, 2018 PDF Download
Form 8-K dated August 23, 2018 PDF Download
Form 10-Q for the quarterly period ended June 30 2018 ZIP Download
Form 10-Q for the quarterly period ended June 30 2018 PDF Download
Form 8-K dated July 6, 2018 PDF Download
Form 8-K dated June 27, 2018 PDF Download
Form 8-K/A dated May 30, 2018 PDF Download
Form 8-K dated May 30, 2018 PDF Download
Form 8-K dated May 18, 2018 PDF Download
Form 10-Q for the quarterly period ended March 31 2018 ZIP Download
Form 10-Q for the quarterly period ended March 31 2018 PDF Download
Form 8-K dated April 25, 2018 PDF Download
Form 8-K dated March 28, 2018 PDF Download
Form 8-K dated February 2, 2018 PDF Download
Form 8-K dated January 3, 2018 PDF Download
Document Name Date/Timeframe Type Download
Form 10-K for the fiscal year ended Dec 31 2017 ZIP Download
Form 10-K for the fiscal year ended Dec 31 2017 PDF Download
Form 8-K dated December 20, 2017 PDF Download
Form 8-K dated November 29 2017 PDF Download
Form 8-K dated November 29 2017 PDF Download
Form 8-K dated October 2 2017 PDF Download
Form 10-Q for the quarterly period ended Sept 30 2017 ZIP Download
Form 10-Q for the quarterly period ended Sept 30 2017 PDF Download
Form 8-K dated September 27 2017 PDF Download
Form 8-K dated September 19 2017 PDF Download
Form 8-K dated July 17 2017 PDF Download
Form 10-Q for the quarterly period ended June 30 2017 ZIP Download
Form 10-Q for the quarterly period ended June 30 2017 PDF Download
Form 8-K dated June 19 2017 PDF Download
Form 8-K/A dated May 31 2017 PDF Download
Form 8-K dated May 31 2017 PDF Download
Form 10-Q for the quarterly period ended March 30 2017 ZIP Download
Form 10-Q for the quarterly period ended March 30 2017 PDF Download
Form 8-K dated March 16 2017 PDF Download
Document Name Date/Timeframe Type Download
Form 10-K for the fiscal year ended Dec 31 2016 PDF Download
Form 10-K for the fiscal year ended Dec 31 2016 PDF Download
Form 10-Q for the quarterly period ended Sept 30 2016 ZIP Download
Form 10-Q for the quarterly period ended Sept 30 2016 PDF Download
Form 8-K dated September 1 2016 PDF Download
Form 10-Q for the quarterly period ended June 30 2016 ZIP Download
Form 10-Q for the quarterly period ended June 30 2016 PDF Download
Form 8-K dated June 30 2016 PDF Download
Form 8-K dated June 21 2016 PDF Download
Form S-4 dated June 14 2016 ZIP Download
Form S-4 dated June 14 2016 PDF Download
Form 8-K dated May 23 2016 PDF Download
Form 8-K dated May 12 2016 PDF Download
Form 8-K dated April 29 2016 PDF Download
Form 8-K dated April 20 2016 PDF Download
Form 10-Q for the quarterly period ended March 31 2016 ZIP Download
Form 10-Q for the quarterly period ended March 31 2016 PDF Download
Document Name Date/Timeframe Type Download
Form 10-K for the fiscal year ended Dec 31 2015 ZIP Download
Form 10-K for the fiscal year ended Dec 31 2015 PDF Download
Form 10-Q for the quarterly period ended Sept 30 2015 ZIP Download
Form 10-Q for the quarterly period ended Sept 30 2015 PDF Download
Form 8-K dated Sept 22 2015 PDF Download
Form 8-K dated August 3 2015 PDF Download
Form 10-Q for the quarterly period ended June 30 2015 ZIP Download
Form 10-Q for the quarterly period ended June 30 2015 PDF Download
Amendment no. 1 Form S-4 dated June 18 2015 PDF Download

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Tri-State Generation and Transmission Association
Office: 303-452-6111
1100 West 116th Avenue
Westminster, CO 80234

Mailing address:
PO Box 33695
Denver, CO 80233-0695

©2023 Tri-State Generation and Transmission Association, Inc. Power supplier to the rural west.

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