U.S. generation from small-scale rooftop solar systems has increased roughly fivefold over the last decade, climbing from 18,812 gigawatthours to 92,979 gigawatthours. Small-scale solar refers to photovoltaic systems with capacity smaller than 1 megawatt.
Four states dominate small-scale solar generation nationally. California, Arizona, Texas, and Florida lead the country in rooftop solar output. All four states sit in regions with favorable solar conditions, contributing to their concentration of distributed solar capacity.
The expansion reflects growing adoption of residential and commercial rooftop installations across the United States. Small-scale solar systems generate power closer to where it is consumed, reducing transmission losses and supporting grid resilience. The technology remains a key component of U.S. renewable energy growth alongside utility-scale solar farms and wind installations.