Ontario's draft lets a transmission battery sell energy, reserve and frequency control in the same hour - the pay formula is blank, and a factory feeder is out
On 15 October 2026 the IESO published a design memo for Phase 2 of its storage program. A dispatchable transmission battery could offer frequency control while also selling energy and operating reserve. Offers are due at 9:00 AM Eastern, with the hourly schedule back by 10:00 AM. Day-ahead, the design holds back one hour of stored energy for that job. In real time the spare is 10 minutes. Settlement is deferred. A battery on a local distribution feeder is outside this draft.