Butler-Warner Generation Plant
PWC has the distinction of being the only municipal utility company in North Carolina to own and operate a power plant. The Butler-Warner Generation Plant (BWGP), named in honor of Robert H. Butler and James R. Warner, former Chairmen of the Commission, was originally built to protect PWC customers from incurring high peaking power costs.
PWC negotiated a long-term full-requirements power supply contract with Progress Energy Corporation (now Duke Energy Progress) which began in 2012, and a companion lease agreement for BWGP was negotiated. Under the terms of this lease agreement, DEP was given the right to dispatch BWGP to meet the needs of the DEP system in exchange for a capacity payment based on how well BWGP performs. The revenue from the lease agreement is used to reduce the rates charged to PWC customers. The current lease term was scheduled to expire in 2023 and has been extended until 2024. A new agreement has been established to take effect in 2024 and will expire in 2032.
The current BWGP equipment is a result of consistent forward thinking and planning by PWC Commissioners and staff in the face of an evolving electric industry. Between 1976 and 1980, PWC installed eight peak-shaving gas turbine generators capable of producing a maximum of 200 megawatts (MW) of electricity using either natural gas or fuel oil. In 1988, six of these units were converted to a combined-cycle steam mode which increased generating capacity of the plant by approximately 65 MW, to a total maximum of 265 MW of generating capacity.
In 2019, PWC built North Carolina’s first municipal Community Solar/Battery Storage Project which is located adjacent to the Plant. The solar project can generate up to 1MW of energy and Butler Warner GP controls the charging and discharging of the stored energy/battery based on likelihood of DEP system peak. While battery can be charged from solar array, its typically charged from the grid at night, when there is no possibility of the Peak hour occurring. The battery project is saving PWC & customers over $100,000 annually and the solar panels save over $40,000 annually.
- Built: Initial Installation: 1976
- Major Upgrade: 1988, 1992
- Generation Capacity: 265,000 kW
- Features: 8 GE Turbines (25,000 kW) each; 65,000 kW Steam Turbine; 1 MW Community Solar Farm, 500KW Battery Storage
- Summer System Peak Demand: 476.6 MW (August 9, 2007)
- Winter System Peak Demand: 492.6 MW (February 20, 2015)
- Distinctions: Included on list of “Plants to See” by the World Energy Conference & APPA