Two-thirds of the power on PJM's grid which serves 65 million people come from fossil fuels. Cities and attorney generals are calling for a priority on climate change.
Some say a just transition is not just about securing help for workers, but the shift to renewable energy can be a driver for redistributing wealth and power in society.
The groups say preparations for construction of a commercial-scale wind turbine by the Ohio National Guard have already violated the Endangered Species Act.
Donald Trump has promised a renaissance for the coal industry. But analysts say the market forces causing the decline of coal and the rise of renewables may be difficult to stop.
Natural gas will be a chief energy export in Pennsylvania for years to come. But the state's vast and largely untapped wind resources could also add to the state's reputation as a major energy player.
