A new paper in PNAS pits U.S. corn‑ethanol farms against photovoltaic arrays and finds the latter dwarf the former in energy yield. Producing the same electricity that one hectare of solar panels generates would require roughly 31 hectares of corn grown for fuel. With about 12 million hectares dedicated to ethanol, the study argues the land is vastly underutilized and could reshape national energy policy.

Researchers mapped ethanol fields within three kilometres of transmission lines, isolating 391,137 hectares – just 3.2 % of the total corn‑fuel footprint. Converting that slice to solar would match the entire nation’s current ethanol energy output and lift solar’s share from 3.9 % to roughly 13 %. Scaling up to 46% of ethanol acreage would satisfy the U.S. 2050 decarbonisation target and avoid additional grid upgrades.

Beyond power, the shift slashes fertilizer use by about 55 million kg of nitrogen and 26 million kg of phosphorus, and cuts irrigation demand. Lease agreements let farmers earn three to four times more per acre than crops, while perennial plantings under panels improve soil and pollinator habitats. The analysis positions ecologically‑informed solar as a practical route to higher farm incomes and lower emissions.