Environmental pushback During the hearings, several groups spoke out against the plan including Nevada Conservation League, Advanced Energy United, Western Resource Advocates and Sierra Club. They say ratepayers would foot the bill for the peakers and it would lead to a natural gas dependency in the state and have environmental impacts. On Friday, Chispa Nevada, a program of the League of Conservation Voters Education Fund, responded to the approval of NV Energy's IRP, calling the peaking units a "costly, polluting methane gas plant," in a news release. Natural gas is primarily composed of methane. "We are extremely disappointed in the Public Utilities Commission. Our community will continue to fight fossil fuel power plants until we end NV Energy's dependence on dirty methane gas," said Audrey Peral, Chispa Nevada Program Director.