CHARLOTTE, North Carolina, Aug. 16 -- Duke Energy issued the following news release: * * * Duke Energy seeks to extend operations for another 50 years at Bad Creek, supporting unprecedented growth in the Carolinas * For more than three decades, the pumped storage hydro station in South Carolina has performed a vital role as the largest "battery" on the company's system * Effort supports the intent of South Carolina leaders to address growth by continuing to operate proven electricity capacit  more