Idaho regulators are looking at the latest integrated resource plan (IRP) of PacifiCorp‘s Rocky Mountain Power unit, which assumes modest 1.1% annual growth and some changes in coal-fired power generation, including the retirement of a unit and replacement with a new natural gas-fired generation facility. Salt Lake City-based Rocky Mountain is the PacifiCorp operating utility in Idaho, Utah and Wyoming. Part of the IRP filed with the Idaho Public Utilities Commission (PUC) calls for Rocky Mountain converting its Naughton Unit 3 coal-fired plant near Kemmerer, WY, to a natural gas-fired plant, and installing emissions control equipment on coal units in Utah (Hunter Unit 1) and Wyoming (Jim Bridger Units 3 and 4). The utility said that these plans are not final, due to the uncertainty of the future federal carbon tax legislation and the U.S. Environmental Protection Agency’s final new standards for power plants. The PUC said it is taking comments from the public through Aug. 8.

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