The wind stops blowing. The sun goes down.What happens next?Former U.S. Secretary of Energy Ernest Moniz explains why the transition to clean energy may be far more complicated than most people realize.In one of the most clear-eyed conversations about our energy future, Moniz pulls back the curtain on what it will actually take to build energy that is clean, reliable, and affordable - and why some of the hardest challenges have little to do with solar panels or wind turbines.He reveals which emerging technologies - from hydrogen to nuclear fusion - could reshape the future of energy, why storage remains a major hurdle, and what many people misunderstand about renewable power.What will it really take to keep the lights on in a low-carbon world?