Today, after a decade-long fight, the Energy Department has begun to enforce rules meant to accelerate the phaseout of incandescent light bulbs. POLITICO’s Kelsey Tamborrino breaks down the new regulations, Washington’s political and culture war over light bulbs, and how the larger fight over energy efficiency standards is still looming. Plus, the first new U.S. nuclear reactor to be built from scratch in decades started sending electricity reliably to the grid on Monday.

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Annie Snider covers water issues for POLITICO Pro.

Kelsey Tamborrino is a reporter covering clean energy.

Josh Siegel is an energy reporter for POLITICO.

Nirmal Mulaikal is a POLITICO audio host-producer.

Alex Keeney is a senior audio producer at POLITICO.

Gloria Gonzalez is the deputy energy editor for POLITICO.

Matt Daily is the energy editor for POLITICO.

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It’s lights out for incandescent bulbs