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Rocky Mountain Power updates Sweetwater County on Gateway projects and forthcoming rate changes
Summary
Rocky Mountain Power told commissioners the Gateway South project is in service and Gateway West segments remain in permitting, described the Anticline–Shirley Basin transmission proposal and timelines, and said a companywide rate filing will raise general rates June 1 before a partial offset from the annual energy-cost adjustment on July 1.
Representatives from PacifiCorp/Rocky Mountain Power updated the Sweetwater County commissioners on long‑range transmission projects and near‑term retail rates during the May 20 meeting.
PacifiCorp representatives said Gateway South (a 500 kV transmission project) was placed into service late in 2024 and that reclamation and final monitoring work remain. They described two major Wyoming transmission initiatives under planning and permitting: the Anticline–Shirley Basin 500 kV project (approx. 152 miles, entirely in Wyoming, with routing and NEPA work ongoing) and Gateway West D‑3 (a segment of the larger Gateway West corridor). Anticline–Shirley Basin remains in environmental permitting (NEPA) and will require more routing field work; PacifiCorp stressed that the federal land/BLM process and the governor’s energy corridors (and associated sage‑grouse concerns) will shape the final route and timing.
On retail rates, PacifiCorp staff told commissioners the company will file an increase effective June 1 that amounts to an average general rate increase of about 10.2 percent; a separate energy‑cost adjustment mechanism (ECAM) to be applied on July 1 is expected to reduce rates by roughly 5.8 percent for a net increase in the company’s filing of about 5 percent in the near term. Commissioners asked whether the grid has capacity for potential large new loads (data centers, large industrial projects) and were told the company believes it can meet organic growth but is updating plans to address larger “spikes” of demand; PacifiCorp said planning for transmission and generation to serve heavy new loads can take years and depends on permitting and infrastructure investments.
PacifiCorp also touched briefly on generation changes (conversion of some coal units to gas in the long term) and the company’s renewable portfolio; the company recommended local engagement with permitting and routing as projects proceed and emphasized permitting windows and environmental constraints would determine construction timing.
Why it matters: new high‑voltage transmission lines can enable renewable generation integration but require lengthy permitting and raise land‑use and wildlife considerations. The rate changes are likely to affect local consumers and businesses and were described as part of PacifiCorp’s routine filings and the annual ECAM adjustment.
