A cutting-edge wind farm paired with battery storage cannot advance under what developers are calling unworkable terms set by Montana’s Public Service Commission.

Caithness Beaver Creek is asking the state’s utility regulators to reconsider terms for the $500 million project near Rapelje. Terms by which Caithness was to sell renewable energy to the utility NorthWestern Energy were set by the PSC in early December. The PSC put the overall avoided cost of the energy at $6 a megawatt hour effectively killing the project, according Caithness.