Public Service Company of Colorado Submits Revised Tariff Sheets for Federal Energy Regulatory Commission Approval

Strategic Insights -

The Public Service Company of Colorado (PSCo) has submitted revised tariff sheets to the Federal Energy Regulatory Commission (FERC) in compliance with FERC's May 15, 2025 order on compliance. The revisions aim to implement the pro forma tariff language included with Order Nos. 2023 and 2023-A, and address the remaining deviations from the Commission's directives. PSCo has dedicated extensive time and effort to address interconnection queue backlogs, but remains concerned that the removal of at-risk financial deposits may worsen the situation.

Key Takeaways:

  • PSCo has submitted revised tariff sheets for FERC approval, implementing the pro forma tariff language and addressing remaining deviations.
  • The revisions aim to promote efficiency and reduce interconnection queue backlogs, but PSCo remains concerned about the impact of removing at-risk financial deposits.
  • PSCo has dedicated extensive time and effort to addressing interconnection queue backlogs, using a process of trial and error to remedy the situation.
  • The Commission's Compliance Order allowed PSCo to retain provisions of its LGIP, SGIP, and associated appendices that have evolved over many years.
  • PSCo has an additional pending compliance filing that would require minor additional changes to the PSCo LGIP in Docket No. ER25-1800.
  • PSCo will monitor its queue after the resolution of this compliance proceeding and consider proposing additional amendments if needed.

Statistics:

  • PSCo serves approximately 1.5 million retail customers in the state of Colorado.
  • PSCo provides open-access wholesale transmission service or ancillary-only services to transmission customers or ancillary services customers under Parts II and III, or IV of the Xcel Energy Joint Open Access Transmission Tariff.
  • The Compliance Order was issued on May 15, 2025.
  • The pro forma LGIP, pro forma LGIA, pro forma SGIP, and pro forma SGIA are included with Order Nos. 2023 and 2023-A.

Sources:

  • Public Service Company of Colorado, Re: Public Service Company of Colorado Xcel Energy Operating Companies Open Access Transmission Tariff Docket No. ER24-2030 Order No. 2023 Compliance Filing #2, July 14, 2025.
  • Public Service Company of Colo., "Order No. 2023 Compliance Filing," Docket No. ER24-2030-000, Transmittal Letter, 2 (filed May 16, 2024).
  • FERC Order on Compliance, May 15, 2025.
  • Improvements to Generator Interconnection Procedures and Agreements, Order No. 2023, 184 FERC P 61,054 ("Order No. 2023").
  • Improvements to Generator Interconnection Procedures and Agreements, Order No. 2023-A, 186 FERC P 61,063 (2024) ("Order No. 2023-A").