Duke Energy Carolinas has issued green bonds totalling $1bn to help finance renewable energy projects in North and South Carolina.
Projects financed will include solar and energy storage, the company said.
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The bonds had a weighted average coupon of 3.74% with between three and 10-year maturities, it added.
Duke Energy chief financial officer Steve Young said: “Today marks a milestone for our company and demonstrates our continued commitment to generating cleaner energy for our customers and communities.
“We are proud to provide this option for investors to advance our goal of reducing carbon emissions by 40% by 2030.”
The company has about 650MW of solar capacity currently and aims to add 1.8GW over the next five years.