US utility giant Duke Energy is lining up a sale for its $4bn Commercial Renewables operation in what one analyst said could be among the largest such deals ever seen in American wind and solar.

Duke Energy announced a strategic review process for Commercial Renewables, which operates 5GW of wind and solar and has what the utility called “a robust development pipeline” in both technologies, as well as long-term power sale deals with “creditworthy counterparties”.