Ontario's $3.2 Billion Grid Expansion Joins a Global Race to Build Transmission Before Data Centres Overwhelm It

Ontario's $3.2 Billion Grid Expansion Joins a Global Race to Build Transmission Before Data Centres Overwhelm It IESO's Sudbury corridor plan mirrors grid bottleneck crises from the US to India, as AI power demand forces utilities into the largest infrastructure build in decades. Ontario's Independent Electricity System Operator proposed a $3.2 billion transmission expansion north of Sudbury, one of the largest single grid investments in Canadian history. The project would open a corridor to connect northern generation assets to southern Ontario's growing load centres, where data centre demand is placing unprecedented strain on a grid designed for a different era of electricity consumption.³ The proposal lands in a year when grid bottlenecks have become the binding constraint on energy investment worldwide. In the United States, all six major regional grid operators outside of Texas have requested extensions on FERC-mandated deadlines to upgrade transmission infrastructure. The extensions acknowledge what utilities have been reluctant to say publicly: the grid cannot keep up with new demand.⁶ Data centres are the primary driver. Capital is rotating into energy companies positioned to supply power for AI buildouts. Fluence Energy illustrated the appetite: shares closed at $24.16 on May 8, up 98.2% in a single week after the company disclosed master supply agreements with two hyperscalers and a record $5.6 billion backlog. Q1 2026 delivered positive adjusted EBITDA of $2.0 million, the fourth consecutive quarter in the black, with non-GAAP gross margin expanding to 52%.¹ The Fluence story captures a broader shift. Nuclear and renewable baseload generation are attracting buyers as the cleanest solutions to address power constraints. CEO Arun Narayanan said the operational discipline and margin profile established in 2025 were "proving durable." PowerTrack manages 37.5 GW of solar assets under management with annual recurring revenue guided to $65-70 million by year-end. Even so, shares were down roughly 39% year to date before the hyperscaler announcement, reflecting how volatile sentiment around grid-adjacent companies has become.¹ India's grid faces the same fundamental problem at a different scale. Power Grid Corporation of India controls nearly 84% of the country's inter-regional transmission capacity and secured over half of competitive project awards in FY25. Yet transmission is lagging behind renewable energy generation commissioning. PGCIL's return on net worth has declined from 18.5% in FY23 to around 15.3% in the first nine months of FY26, and the company delivered a roughly 12% CAGR between FY20 and FY26, compared to 18% for the Nifty 50.⁴ The pattern is consistent across continents: generation is outrunning the wires needed to move it. India is targeting 500 GW of renewable energy by 2030, but the grid to deliver that power to demand centres is being built on a slower schedule. Ontario's IESO proposal is an attempt to avoid the same mismatch.⁴ Utility scale is becoming a competitive advantage. NextEra Energy and Dominion Energy announced a landmark all-stock merger valued at approximately $249 billion, creating what they describe as the world's largest regulated electric utility by market capitalisation. Deloitte analysts noted that scale is becoming increasingly critical for utilities to compete, access capital, and execute the transactions that the grid buildout demands.⁵ Enbridge's decision to revive its Algonquin gas transmission expansion for New England reflects a parallel infrastructure deficit in gas. Natural gas futures faltered midweek as weather demand eased and supply pressures moderated. But the structural shortage of pipeline capacity into the US northeast persists, and each winter tests the same bottleneck.³ Even smaller European markets are investing in pipeline capacity. Slovenia and Croatia plan to raise their gas interconnection capacity six-fold from 260 mcm/year to 1.5 bcm/year by the end of 2026, Montel reported. The expansion reflects a post-Hormuz recognition that energy security requires redundancy in both power and gas transmission.² In Australia, APA Group selected Worley for a three-year engineering contract covering natural gas transmission and storage projects. The partnership aims to deliver phased and scalable infrastructure, the kind of incremental capacity-building that the global energy system needs but has consistently under-delivered.⁷ Ontario's $3.2 billion bet on transmission north of Sudbury will take years to build and faces the same regulatory and execution risks that have slowed grid projects everywhere. The question is whether data centre operators will wait. If they cannot connect to the grid on their timeline, they will build captive generation, and that generation is more likely to run on gas than on the grid's existing nuclear and hydro baseload.^6,1