IESO Introduces Changes to Connection Process Deposit
September 4, 2026
The IESO is updating the deposit structure for its connection process. This structure has remained unchanged since the early 2000s, and as connection activities continue to evolve in scale and complexity, updates will ensure it accurately reflects the costs of connecting new or modified facilities to the Ontario's electricity system. The update introduces a tiered deposit structure based on project size (Megawatt) and updates the deposit amount for technical feasibility studies, giving market participants a greater understanding of costs upfront. These changes will also better align initial financial commitments with the scope and requirements of each project, supporting consistent and transparent connection process.
In addition, the IESO will now invoice for these activities on an ad-hoc basis when costs exceed the deposit. Together, these updates aim to strengthen cost recovery, improve financial transparency, and keep the connection process efficient as system demands grow. Changes take effect with the baseline update, on Sept. 9.
Baseline changes can be viewed on Pending Changes Documents webpage.
For more information, please visit Updates to Connection Process Deposit engagement webpage.