Grid battles.

Utility companies and regulators are butting heads over how to pay for cleaning up the grid, as a recent clash between Illinois regulators and utility company Exelon exemplifies, Bloomberg reports.

Key quote: “We’re trying to move to a 21st century grid with 19th century rules,” said Calvin Butler, the CEO of Exelon. “You cannot build a grid of the future playing the same old playbook.”

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Cat Clifford

Senior Science and Economics Correspondent