During a town hall meeting Thursday, Democratic presidential nominee Joe Biden again assured shale producers that he wouldn’t ban fracking if elected. Then, in virtually the same breath, he touted his $2 trillion clean-energy plan, which aims to edge natural gas out of the power mix within 15 years. The former vice president’s efforts to walk a tightrope on gas reflect the fossil fuel’s precarious place in the economy. For now, it’s an essential part of American life. Biden has been careful not to make an enemy of the industry, especially in the key battleground state of Pennsylvania, home to the largest U.S. shale-gas field. His policies may even, in the short-term, support the gas market.

But in the long run, the fuel may prove economically and environmentally untenable within the power sector, a key market for producers. Biden’s climate plan would only accelerate that outcome, with massive investments in wind, solar and battery storage giving those energy sources a leg up. And his goal of a carbon-neutral grid would severely curb, if not destroy, gas’s share of the pie in favor of cheaper, cleaner renewables.

“Decarbonization isn’t a debate — it’s a fossil-fuel death sentence,” said Kevin Book, managing director of ClearView Energy Partners. “It means a resource is going off the grid. That is the inevitable implication.”