Client: Sierra Club and Natural Resources Defense Council (NRDC)
Authors: Tyler Comings
September 2025
Principal Economist Tyler Comings provided testimony before the Colorado Public Utilities Commission on resource plan modeling done by Public Service Company (or Xcel Colorado). Mr. Comings found that the utility should make many changes to its modeling methodology including allowing market access, justifying that new gas resources will be carbon-free, and correctly discounting social costs of carbon and methane.