Xcel offered the first voluntary decarbonization plan by any large investor-owned utility, but it includes converting coal plants to run on natural gas and buying another natural gas plant that would run for decades. Credit: Andy Cross/Denver Post via Getty Images As major U.S. utilities began making pledges this past year to cut their greenhouse gas emissions to net-zero, or close to it, by mid-century, one of them was already drawing up a road map to make it happen. Minneapolis-based Xcel was the first large investor-owned utility in the country to set the goal, in December 2018, and it spent 2019 planning how to get there. But even a leader in renewable energy like Xcel is finding it difficult to shed fossil fuels completely before the 2040s, raising questions about any utility’s ability to break from coal without adding new carbon energy in other forms, mainly natural gas. Our […]