Colorado PUC expands transmission-rule overhaul, says Tri-State line needs no CPCN
Colorado regulators on June 10 expanded a transmission-rule overhaul and, in the same meeting, said Tri-State’s Sydney Holcomb 345-kV line does not need a CPCN because it crosses Colorado without serving Colorado customers or interconnecting with Colorado facilities.
The Colorado Public Utilities Commission on June 10 expanded the scope of a pending transmission-rule overhaul and, in the same meeting, said Tri-State Generation and Transmission’s Sydney Holcomb 345-kV line does not need a Colorado certificate of public convenience and necessity because the project crosses the state without serving Colorado customers or interconnecting with Colorado facilities.
The paired actions matter because they address both sides of a long-running transmission-policy debate: when utilities must undergo full CPCN review for a line, and what evidence regulators will require before approving future transmission projects and related cost recovery.
At the June 10 commission meeting, advisory staff said the rulemaking would revise rules on transmission planning, transmission utility reporting, CPCNs, transmission issues in electric resource planning, advanced transmission technologies and transmission cost recovery.
Staff told commissioners the planning changes would push utilities toward a 20-year transmission horizon and require more detailed consideration of wildfire mitigation, ordinary-course investments, joint development opportunities, generation and demand-side alternatives, financing options, and stakeholder input on planning assumptions and methodologies.
On CPCNs, staff said future transmission applicants would have to show that a proposed line is consistent with the latest transmission plan or explain why it is not. Staff also said applicants would need to demonstrate through modeling and, where appropriate, cost-benefit analysis that a preferred project is superior to viable alternatives.
The rulemaking also reaches utility reporting and cost recovery. Staff said at the meeting that annual transmission investment reports for Public Service Co. of Colorado, Black Hills and Tri-State would more clearly distinguish capacity-expanding projects from repair-or-replacement work, which could help determine which investments may qualify for accelerated recovery through the transmission cost adjustment. Staff also said major reported investments would need to align with the latest transmission plan.
In electric resource planning cases, staff said utilities would have to provide additional transmission information in direct filings, Phase II requests for proposals and implementation reports, including the cost of delivering power from generation interconnected at different geographic and electrical points on the grid.
Under the advanced-transmission-technology portion, staff said utilities would have to periodically evaluate the economic potential of advanced conductors and other grid-enhancing technologies on their existing systems and file prioritized implementation plans. Staff also described independent savings reviews and a shared-savings mechanism tied to recently enacted state law.
The same meeting also produced a more immediate ruling on Tri-State's Sydney Holcomb project. Advisory staff told commissioners the roughly 300-mile line runs from Sidney, Nebraska, to Holcomb, Kansas, through eastern Colorado as a Southwest Power Pool-directed regional transmission project selected in SPP's planning process.
Staff said the line does not interconnect with Colorado facilities, does not serve Colorado load, and would not be paid for by Colorado customers alone. Commissioners then agreed that a Colorado CPCN is not required for the project.
The accessible meeting record suggests commissioners treated that exemption as fact-specific rather than as a broad new doctrine. Advisory staff recommended that the commission limit its ruling to finding that no CPCN is required for this project and avoid deciding Tri-State's other arguments.
But the written rulings themselves were not publicly accessible in the reporting record reviewed for this assignment, so the exact legal language, docket details, deadlines and any formal limits on the decision's precedential effect could not be independently verified.
That leaves the statewide rulemaking as the more likely venue for the commission to define future transmission standards in detail. Based on the accessible public record, the June 10 actions signal that Colorado regulators are trying to set clearer rules both for projects that do require CPCN review and for the evidence utilities must provide before passing major transmission costs to customers.