Diversity in energy sources is "the key characteristic" of the U.S. electric system, but the "energy mix that sustains the grid is changing," writes Sen. Lisa Murkowski, R-Alaska. The main challenge is ensuring that the electric grid is stable amid the shutdown of nuclear plants while "managing an increasingly variable energy mix," she argues. Murkowski adds that regulators, the industry and other leaders must play a role in addressing the issues facing the electric grid, and "powerful regulatory laws must be judiciously administered."

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