ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins69% CONFIDENCEOverall confidence: 69%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidencein 253 days
WFAE[4]: Duke "aims to finish construction during the second half of 2027"; Business NC reported the third quarter of 2027; Canary Media[2] said "expected by October 2027"; EIA-860M tracked by Cleanview[3] lists 1 July 2027. The May 2026 construction start was not independently confirmed.Duke Energy plans a second battery at its former Allen Steam Station in Gaston County, North Carolina: a four-hour 167 MW (668 MWh per Canary Media) system, its largest, with construction slated to begin in May 2026 and operation in the second half of 2027; no cost has been published for it.