A new Ember analysis reveals that solar power plants now require less upfront investment than coal or gas plants for the same amount of electricity delivered, marking a fundamental shift from a decade ago when solar could require up to five times as much. This milestone is driven by an 87% drop in solar PV's total installed cost since 2010, according to IRENA. Additionally, battery storage costs have declined by 93% over the same period, making firm solar-plus-battery electricity cheaper than new coal or gas capacity globally.