Ontario’s data centre playbook proposes three approval pillars and a new electricity rate class. Only one of the four tests carries a number, and that is the one to plan around.
- Ontario’s energy ministry estimates new data centre connection requests could total more than 10,000 MW, against a recent provincial peak of about 25,000 MW.
- The proposed rate class would bill new data centres above a threshold such as 1 MW separately and keep them out of the Industrial Conservation Initiative.
- The three pillars (economy, sovereignty, communities) are assessment criteria in a proposal, with no published weights.
- Comment closed September 12, 2026. The final playbook and the connection regulation are still to come.
On August 13, 2026, Ontario posted the framework for its data centre playbook to the Environmental Registry of Ontario for 30 days of comment, and that window closed on September 12. The Ontario data centre playbook proposes three pillars for judging which new facilities may connect to the grid, plus a separate electricity rate class for new data centres above roughly 1 MW. Read as a document rather than as a launch, only one of its four tests has a number attached, and that is the test a builder, a host municipality or an Ontario business renting cloud capacity should plan around first.
What the Ontario data centre playbook is, and what it is not yet
The instrument is a regulatory proposal, notice 026-0853, posted by the Ministry of Energy and Mines and announced in a release from the Premier’s office. The legal hook already exists: amendments to the Electricity Act, 1998 let cabinet set out, by regulation, requirements that covered data centres must meet before they connect or reconnect to the grid. The regulation itself is something the province says it is considering drafting. Its status, then, is announced and consulted on, not in force.
That distinction matters because the release speaks in the future tense about data centres paying the full cost of their electricity, while the registry notice speaks in the conditional. The release has decided. The regulation has not been written.
The four tests, ranked by how much they bind
We rank the tests by one question: how much of each could a regulator, a council or a customer actually hold a project to on the current text?
- The rate class. New data centres above a demand threshold, with 1 MW given as the example, would be billed in a separate class for the Global Adjustment and could not join the Industrial Conservation Initiative, the program that lets large users cut costs by reducing demand in the five peak hours of the year. It is the only test that turns a policy aim into a line on an invoice. Existing data centres stay under the current framework.
- Data security and digital sovereignty. The notice states a preference for Canadian-owned and operated data centres and alignment with federal residency objectives. A preference is weaker than a requirement, but it is specific enough for a procurement team or a council to cite.
- Community investment and public trust. It looks for significant investment in host communities, local labour, training and apprenticeships, and closed-loop cooling to limit water use. None of those items has a threshold, so a municipality will have to write its own into a host agreement.
- Economic development. Jobs, investment, tax revenue and domestic supply chains: the test every applicant already says it passes. With no weights or minimums published, it ranks last on enforceability.
Fine Print
Two sentences in the registry notice deserve more attention than the pillars. The ministry estimates that data centres now in the conservation program account for roughly 100 to 200 MW, while applications for new connections could total more than 10,000 MW. Ontario’s recent peak demand, by the same notice, has been about 25,000 MW. On our arithmetic, the queue equals about 40% of that peak, which goes some way to explaining why the rate class arrived with the pillars rather than after them.
The notice also asks the public which pillar should carry the most weight. That question was put to commenters because, on the evidence of the text, it has not been settled inside government either.
What it means for Ontario businesses buying cloud and AI capacity
Most Ontario firms will never build a data centre, but many will rent space or compute in one. If the rate class is adopted as proposed, new local capacity carries an electricity cost that existing capacity does not, and that difference can surface in the price of Canadian-hosted compute. The sovereignty preference works in the other direction, favouring Canadian-owned operators in the approval queue. When a provider quotes Ontario-hosted capacity, ask which facility the workload runs in, whether that facility is new or existing, and how changes in electricity cost pass through the contract.
Ottawa set out its own national data centre principles three weeks after Ontario’s notice went up. Saskatchewan is testing a different model built on power generated off the grid, which we cover in our Bell AI Fabric cost analysis, and the Moose Jaw data centre that stalled on power shows how often electricity, not policy, decides. The wider picture is in our AI data centres in Canada guide.
What host municipalities can put in writing now
Until the regulation exists, the bargaining power sits with the municipality and the landowner. A council weighing a proposal can ask the applicant to state, in the host agreement, its expected connected load in megawatts, its cooling method and annual water draw, its local hiring and training commitments with numbers attached, and whether it expects to fall inside the new rate class. Each of those answers maps onto a pillar the province will later assess, which makes the council’s file useful evidence rather than a duplicate of the provincial one.
What would change this ranking
If the final playbook publishes weights or minimum scores for the pillars, the sovereignty and community tests move up. If the rate class is dropped, or its threshold rises far above 1 MW, the ranking flattens and the playbook becomes guidance rather than a gate.
FAQ
What is Ontario’s data centre playbook?
A proposed framework, posted August 13, 2026, that would assess new data centres against three pillars before the province approves a grid connection, alongside a separate electricity rate class for large new data centres.
Is the Ontario data centre playbook in force?
No. The registry notice is a proposal, the comment period closed September 12, 2026, and the connection regulation is still to be drafted.
Which data centres would the new rate class cover?
New data centres above a demand threshold, with 1 MW given as an example. Existing data centres would stay under the current Class A or Class B framework.
