The CEO of the largest nuclear utility in the country on Thursday pressed federal grid regulators to come to grips with climate change by prioritizing incentives for emission-free technology in the markets overseen by Washington.

“We would ask that the commission be able to come to grips and address the climate imperatives that the states are driving us to comply with, to find a way to work with the market rules,” Crane Exelon president and CEO Christopher Crane told Federal Energy Regulatory Commission Chairman Neil Chatterjee at a conference held at the agency’s headquarters.