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Wyoming Public Service Commission

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The Commission regulates four investor owned electric utilities that operate in Wyoming. In addition, the Commission also has regulatory authority over eighteen retail rural electric cooperatives that provide electric service within the state.

The PSC has the following primary duties regarding the regulation of electric utilities:

  • Hearing rate cases and approving rates and tariffs for the companies
  • Reviewing, analyzing and hearing electric utility applications to pass-on wholesale cost increases in the cost of electricity
  • Reviewing integrated resource plans for large electric utilities
  • Granting certificates of public convenience and necessity for large facilities, including power plants and some transmission lines
  • Establishing accounting and depreciation procedures for utilities
  • Approving mergers, acquisitions and transactions between companies
  • Approving the issuance of securities and creation of liens by the utility
  • Mediating consumer complaints regarding electric service issues

Electric Integrated Resource Plan (IRP) Guidelines

2011 Interest Rate Set

The interest rate provided for in Section 241(c) and Section 504(f)(iii) was set November 23, 2010, in Docket No. 90090-5-XO-10. The interest rate is 1.80% per annum for the period of January 1 through December 31, 2011. NOTE: The interest rate provided for in Section 241 is incorporated by reference in Rule Section 250, Electric, Gas, and Water Public Utility Commodity Balancing Account as a Basis for Periodic Pass-On Filings, when a utility charges or collects interest on any over- or under-collected balance in an authorized Commodity Balancing Account.


These downloadable files are available as Adobe Acrobat pdf files.

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Electric Utilities Registration Form

Required Filings Cover Sheet