Canada has quietly built one of the most powerful energy weapons in North America—and Donald Trump just forced it into the spotlight. After the Trump administration imposed tariffs on Canadian energy, Quebec reminded Washington of an uncomfortable reality: much of New England’s electricity quite literally depends on Canada. For decades, Canadian hydropower has kept lights on, prices stable, and climate targets within reach across the U.S. Northeast. Now, that relationship is under strain, and the consequences could be severe.

For more than 40 years, New England and New York have relied on Quebec’s massive hydroelectric system as a backbone of their power supply. Vermont gets roughly 25% of its electricity from Canada, while Hydro-Québec supplies about 10% of New England’s total demand—far more during winter cold snaps and summer heat waves. This isn’t emergency power; it’s structural dependence, reinforced by long-term contracts and billions of dollars in transmission infrastructure built specifically to move Canadian electricity south.

That dependence deepened dramatically in 2026, when two major transmission projects finally came online. Massachusetts completed the $1.6 billion New England Clean Energy Connect, while New York advanced the Champlain Hudson Power Express—together capable of delivering more than 20 terawatt-hours of electricity annually under 20-year fixed contracts. These deals were sold to voters as the cornerstone of clean energy plans, promising lower costs, grid stability, and major emissions reductions. Then came Trump’s tariffs.

When the U.S. slapped a 10% tariff on Canadian energy imports, Hydro-Québec responded almost immediately by halting spot-market electricity exports to New England. Quebec officials framed it as an economic decision—but the message was unmistakable. Premier François Legault openly stated that Quebec was exploring its legal options, including whether new contracts could be reconsidered if tariffs fundamentally altered their economics. It wasn’t a threat of blackout, but it was a warning shot.

The leverage lies in physics, not politics. Electricity cannot be rerouted like oil or gas. It flows through fixed transmission lines between directly connected grids. Quebec controls vast reservoirs and can choose when—and whether—to release water for power generation. New England, by contrast, relies heavily on natural gas, where prices spike during peak demand. Without Canadian hydropower to smooth those spikes, electricity costs would rise, emissions would increase, and grid reliability would weaken—especially during extreme weather.

The stakes are enormous. Analysts estimate that electricity trade between Quebec and the U.S. Northeast could exceed $290 billion by 2050. That figure represents more than revenue; it underpins climate policy, economic competitiveness, and energy security for millions of Americans. Trump’s tariffs were meant to project strength. Instead, they exposed a vulnerability—and handed Quebec a form of leverage Washington had largely forgotten existed. The lights are still on in New England, but after this confrontation, everyone knows they don’t have to be.