The Charlotte-based utility is requesting bids from solar, wind, biomass, landfill gas and other facilities that qualify as a renewable energy resource, excluding swine and poultry waste.
A state law requires the company to generate 12.5 percent of its retail sales through renewable energy or energy efficiency programs by 2021.
The company says 750,000 megawatt-hours is equivalent to what 400 megawatts of solar capacity generates in a year. That's enough to supply energy to nearly 62,000 homes.
Rob Caldwell, president of Duke Energy Renewables, says bidders can choose to either build projects themselves or sell projects under development to Duke Energy. All projects must be operating by Dec. 31, 2018.