Today’s power market designs were fashioned primarily for systems with dispatchable, non-storable generation– are those designs “fit for purpose” for tomorrow’s systems dominated by wind, solar, and battery resources? Although many of the fundamental principles will still apply in the future, there are several reforms that will be critical if we want to get the full economic and emissions reduction benefits of renewables, while keeping the lights on. These include addressing inconsistencies between retail and grid market incentives, and creating level playing fields for flexibility services and contributions to reliability, and expanding the time horizons and geography of spot markets.