Ameresco JV Brings 250-MW Ontario Battery Online
- Ameresco and Atura Power launch Ontario’s 250MW/1,000MWh battery, powering grid flexibility, peak support, and renewable smoothing—delivering revenue optimization as operators manage dispatch and battery life.
Ameresco’s Canadian unit and joint-venture partner Atura Power, a unit of Ontario Power Generation, have begun commercial operations at a 250-MW/1,000-MWh battery energy storage system in Ontario. The four-hour asset is designed to provide grid flexibility, including support for evening peak demand and smoothing variability from wind and solar.
The project can serve multiple functions, such as energy arbitrage, operating reserves, frequency response and congestion support, depending on market rules. With commissioning complete, operators will focus on dispatch optimization and battery degradation management to maximize revenue while preserving lifetime. The startup also underscores Ontario’s growing reliance on large-scale storage as planned projects move into active service.
How does Ameresco and Atura’s 250MW/1,000MWh Ontario battery support grid flexibility?
- Provides “firming” for intermittent wind and solar by shifting stored energy to times when generation dips, reducing ramps seen by grid operators.
- Supports evening peak demand by discharging over the asset’s multi-hour window, helping utilities meet higher load as renewables wane.
- Enables energy arbitrage by charging during lower-price/oversupply periods and discharging when prices and demand rise.
- Offers grid services that improve reliability, such as operating reserves (holding capacity to respond quickly to changes in system conditions).
- Enhances frequency stability through fast-responding controls that can counter short-term frequency deviations.
- Mitigates congestion by supplying or absorbing power locally when transmission constraints would otherwise limit transfers, subject to market participation rules.
- Can reduce the need for slower, fossil-based peaking units by covering shortfalls and smoothing variability, lowering ramping requirements on conventional generation.
- Improves operational flexibility for dispatchers by giving a controllable resource that can be scheduled ahead of time and adjusted in near real time.
- Increases resilience during grid disturbances by providing rapid injection/withdrawal of power compared with generation that requires longer response times.
- Supports participation in multiple market “stacks,” with dispatch and revenue optimized while managing battery state-of-health to preserve usable lifetime.