New Market Rule Amendment Enables Tariff Response Charge
March 13, 2025
Following the introduction of Ontario Regulation 25/25, the IESO has implemented urgent Market Rule Amendments that introduce a new Tariff Response Charge, which allows the IESO to apply an additional charge on all exports from Ontario’s electricity market destined for the United States, whether flowing directly or through another Canadian jurisdiction.
The IESO has received two letters from the Minister of Energy and Electrification: dated March 10, 2025, being asked to apply a surcharge of $10/MWh; and dated March 11, 2025, being asked to revise the surcharge to $0/MWh, along with Ontario retaining the ability to reinstate a surcharge at any time.
For more information, please refer to the Background and FAQ document, or the IESO's website.