Power-Sector Climate Pledges Revive Debate Over Clean-Energy Mandates

Utilities across the country are unveiling plans to dramatically cut greenhouse-gas emissions, but is a regulatory mechanism needed to ensure they hit their targets?

In this July 27, 2018, file photo, the Dave Johnson coal-fired power plant is silhouetted against the morning sun in Glenrock, Wyo.
AP Photo/J. David Ake