2026 Transmission Rights Auction Schedule
The following table summarizes key activities and dates associated with the Transmission Rights (TR) Market in the calendar year 2026.
While it is the IESO’s intention to have the TR Auction activities occur on the dates proposed, the Market Rules allow for the TR Auction to occur anywhere within a specified period of time.
Should invoice payments not be received by the payment due date, the Transmission Rights shall not be issued to the TR bidder, and additional penalties shall be applied as outlined in Market Rules, Chapter 8, Section 3.20
| Auction Name | TR Ownership Period | Pre Auction Publication | TR Deposits Due | TR Bid Window | Invoice Date | Payment Due Date |
|---|---|---|---|---|---|---|
| ST_20260201 | Feb 1 to 28, 2026 | December 15, 2025 | January 7, 2026 | January 14/15, 2026 | January 26, 2026 | January 28, 2026 |
| ST_20260301 | Mar 1 to 31, 2026 | January 6, 2026 | January 29, 2026 | February 5/6, 2026 | February 17, 2026 | February 19, 2026 |
| LT_20260401 | Apr 1, 2026 to Mar 31, 2027 | December 23, 2025 |
Round 1 - January 19, 2026 Round 2 - January 22, 2026 |
Round 1 - January 26/27, 2026 Round 2 - January 29/30, 2026 |
February 9, 2026 | February 11, 2026 |
| ST_20260401 | Apr 1 to 30, 2026 | February 9, 2026 | March 4, 2026 | March 11/12, 2026 | March 23, 2026 | March 25, 2026 |
| ST_20260501 | May 1 to 31, 2026 | March 10, 2026 | March 31, 2026 | April 9/10, 2026 | April 20, 2026 | April 22, 2026 |
| ST_20260601 | Jun 1 to 30, 2026 | April 2, 2026 | April 29, 2026 | May 6/7, 2026 | May 19, 2026 | May 21, 2026 |
| LT_20260701 | Jul 1, 2026 to Jun 30, 2027 | April 10, 2026 |
Round 1 - May 4, 2026 Round 2 - May 7, 2026 |
Round 1 - May 11/12, 2026 Round 2 - May 14/15, 2026 |
May 26, 2026 | May 28, 2026 |
| ST_20260701 | Jul 1 to 31, 2026 | May 11, 2026 | June 3, 2026 | June 10/11, 2026 | June 22, 2026 | June 24, 2026 |
| ST_20260801 | Aug 1 to 31, 2026 | June 8, 2026 | June 30, 2026 | July 8/9, 2026 | July 20, 2026 | July 22, 2026 |
| ST_20260901 | Sep 1 to 30, 2026 | July 13, 2026 | August 5, 2026 | August 12/13, 2026 | August 24, 2026 | August 26, 2026 |
| LT_20261001 | Oct 1, 2026 to Sep 30, 2027 | July 17, 2026 |
Round 1 - August 10, 2026 Round 2 - August 13, 2026 |
Round 1 - August 17/18, 2026 Round 2 - August 20/21, 2026 |
August 31, 2026 | September 2, 2026 |
| ST_20261001 | Oct 1 to 31, 2026 | August 11, 2026 | September 2, 2026 | September 10/11, 2026 | September 21, 2026 | September 23, 2026 |
| ST_20261101 | Nov 1 to 30, 2026 | September 1, 2026 | September 23, 2026 | October 1/2, 2026 | October 13, 2026 | October 15, 2026 |
| LT_20270101 | Jan 1, 2027 to Dec 31, 2027 | September 18, 2026 |
Round 1 - October 9, 2026 Round 2 - October 15, 2026 |
Round 1 - October 19/20, 2026 Round 2 - October 22/23, 2026 |
November 2, 2026 | November 4, 2026 |
| ST_20261201 | Dec 1 to 31, 2026 | October 13, 2026 | November 4, 2026 | November 12/13, 2026 | November 23, 2026 | November 25, 2026 |
| ST_20270101 | Jan 1 to 31, 2027 | November 10, 2026 | December 3, 2026 | December 10/11, 2026 | December 21, 2026 | December 23, 2026 |
Preliminary Settlement Statement - 2 business days after trading day
Time to file a Notice of Disagreement - 2 business days after preliminary settlement statement is issued
Final Settlement Statement - 6 business days after trading day
Billing Period - Trading week (Sunday to Saturday)
Invoice - 6 business days after the end of the trading week (a Monday unless there is a holiday in the week)
Payment - Payments to IESO within 2 business days of invoice issue
The Pre Auction Publication date represents the market rule requirement for the publishing of the Transmission Rights Market Pre Auction reports. Actual publishing may occur earlier.
The TR Bid Window normally opens at 09:00 EST of the first day and closes at 17:00 EST of the second day.
The maximum number of transmission rights that can be allocated in each auction is determined by the process described in Market Manual 4.4.
Transmission Rights Auction Settlement information can be found in the Financial Market Settlement Schedule and Payment Calendar.
TR Auction Schedule is based on the IESO’s expectations as of publishing but is subject to change. As per the IESO Exemption, if the IESO intends to cancel a transmission rights auction or reinstate a previously cancelled transmission rights auction, the IESO will provide notice via an IESO Bulletin and will issue an updated TR Auction Schedule to reflect the change, and such notice shall be provided no later than the publishing date of the pre-auction report for such transmission rights auction. A copy of the IESO Exemption can be found at the following location on the Active Exemptions webpage.