The companies say that the pipeline is needed to meet the increased demand for natural gas, as coal-fired power plants retire.
Since 2011, Duke Energy has opened five new, cleaner-burning natural gas-fired power plants in the state. Piedmont pipelines supply natural gas to all five facilities.
Duke Energy also has proposed a new natural gas-fired power plant in South Carolina.
Duke Energy and Piedmont are also considering "a joint venture, ownership interest, strategic partnership or other financial-based arrangement" the solicitation says.
The companies seek a natural gas pipeline capacity of up to 900 million cubic feet per day, with a target in-service date of late 2018.
A proposal is expected to be selected and announced by the end of 2014.
Read more natural gas news