Why It Matters
Massachusetts has staked a significant share of its clean energy future on imported Canadian hydropower, but a two-week interruption to its primary transmission link this spring exposed how fragile that strategy remains. With a heat wave building and natural gas still supplying the majority of the region’s electricity, questions are mounting about whether the state’s timeline for reducing fossil fuel dependence is realistic.
What Happened
The New England Clean Energy Connect transmission line — a 145-mile corridor designed to carry hydropower from Québec into Massachusetts — went offline on May 26 and did not resume service until June 8, a 14-day interruption that coincided with temperatures approaching 90 degrees in Boston.
The NECEC had only been completed in January, making the spring outage an early test of infrastructure the region is counting on heavily. Hydro-Québec attributed the downtime to normal startup challenges, with spokesperson Lynn St-Laurent saying, “With any new transmission infrastructure, a period of optimization and fine-tuning is to be expected.”
The disruption did not occur in isolation. Vineyard Wind, the offshore wind project expected to contribute meaningfully to Massachusetts clean energy goals, is operating at less than half its intended output because of ongoing litigation with turbine supplier GE Vernova. The combination of two major clean energy sources underperforming simultaneously left the regional grid leaning harder on conventional power sources than planners anticipated.
By the Numbers
20 percent: The share of Massachusetts electricity consumption the NECEC was projected to supply at full capacity.
60 percent: The portion of New England’s electricity coming from natural gas as of Monday afternoon, up from approximately 55 percent for the same period last year.
40 percent: The share of peak power that New England drew from oil during a January cold-weather stress event, when an earlier NECEC outage drove greenhouse gas emissions sharply higher.
145 miles: The length of the NECEC transmission corridor from the Canadian border to Massachusetts.
2022–2024: The period during which Canadian hydropower imports to the region had already been declining, a trend now compounded by a record drought affecting Québec’s reservoir levels.
Zoom Out
The NECEC episode fits a pattern visible across multiple states that have pursued aggressive clean energy buildouts while retiring or constraining fossil fuel generation before replacements are fully operational. Massachusetts, in particular, has faced repeated setbacks — from offshore wind contract cancellations to, more recently, years of delays in deploying federally supported electric vehicle charging infrastructure. The state has spent nearly four years without building a single station using available federal EV charging funds.
Québec’s drought adds an environmental variable that long-term energy planners had not prominently featured in public risk assessments. Hydropower has generally been treated as a reliable baseload alternative to fossil fuels, but shifting precipitation patterns in northeastern Canada are challenging that assumption over multi-year horizons.
Joseph LaRusso of the Acadia Center sought to limit concern about grid reliability, noting that the region would not be “put on the back foot because NECEC is not delivering full power.” But with natural gas dependency actually rising compared to last year, affordability and reliability critics are pointing to the gap between clean energy commitments and current grid realities.
The Hydro-Québec contract does include penalty provisions for non-delivery, which may provide Massachusetts ratepayers some financial protection during disruptions. However, those provisions do not address the broader supply challenge when the underlying cause is drought rather than mechanical failure.
What’s Next
Power was restored to the NECEC on Tuesday, June 11, and the line is expected to resume moving Canadian hydropower south. State energy officials and grid operators will be watching closely to see whether the line can sustain consistent output through the summer demand period without further interruptions.
The Vineyard Wind litigation with GE Vernova remains unresolved, meaning that project is unlikely to return to full capacity in the near term. Together, the two shortfalls will keep pressure on state regulators to assess whether Massachusetts’ clean energy portfolio has sufficient redundancy — or whether the transition away from natural gas is moving faster on paper than on the grid.