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Programs / Capacity Auction
NEXT WINDOW

IESO Capacity Auction

Commit to reduce load when called. Get paid whether or not you are.

~$170k – $180k per MW-year Indicative value
Ontario Jurisdiction
What it is

A yearly competition in which a resource commits to reduce load on the system operator’s call. Payment is for the commitment, not the energy, so a battery earns whether or not it is dispatched.

Timing

Qualification opens 10 September 2026. The auction runs 25–26 November 2026.

Who qualifies
  • 1 MW minimum — a single cabinet does not qualify
  • Four-hour sustained capability
  • Qualification completed before the auction
  • Smaller sites can participate through an aggregator
What it is worth
  • Roughly $170,000 to $180,000 per MW-year at recent clears
  • Revenue is contracted, not weather-dependent
  • Stacks with Global Adjustment and demand charges
Watch out for
  • The 1 MW floor and four hours together drive a 4 MWh minimum
  • Failure to perform on a call carries penalties
  • Qualification takes longer than people plan for
The architecture that suits it

P37 — Reference architecture

P37  //  GRID + BESS
GRID SERVICES
GridPCC Protanti-islandRev. Mtrbi-dirPCC BrkBESSBatt DC Protbrk + fusePCSGFLBESS BrkBMSXFMRif req.Switchboardexisting or newLoad BrkLoadsEMSPCC / REVENUE BUScontrol / comms
Grid
BESS
PCS / Inverter
DC Protection
Breaker
Switchboard
Transformer (if required)
Protection Relay
Loads
EMS / Controller
BMS
Revenue Meter
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How we help

We size for the four-hour obligation, confirm the aggregation route if you are under 1 MW, and prepare the qualification package.