The Champlain Hudson Power Express (CHPE), a 339-mile underground transmission line connecting Quebec to Queens, intends to transform New York’s energy mix by delivering abundant hydropower. However, after its May inauguration, the line has experienced significant downtime, raising concerns about its reliability and impact on the state's grid during peak demand.
- CHPE can deliver up to 20% of NYC’s electricity with hydropower.
- Two outages have sidelined the line for much of July 2026.
- Experts see early faults as typical but highlight drought risks.
What happened
The Champlain Hudson Power Express (CHPE) recently began operations, bringing renewable electricity from Quebec to New York City through an underground transmission line spanning 339 miles. Officially the longest underground power cable in North America, CHPE opened in May 2026 after nearly 15 years of planning and construction. The privately funded $6 billion project is designed to import significant clean energy, primarily hydroelectric power, to help meet New York’s growing electricity needs while reducing reliance on fossil fuels.
However, since starting service, the power line has experienced two major outages in early July. The first outage on July 1 originated from a technical trip at a converter station on the Canadian side, while a subsequent outage beginning July 4 resulted from a damaged cable segment on the U.S. side of the border. Repair work including cable replacement and testing is ongoing, delaying the line’s return to full operational status as of late July 2026.
Why it matters
CHPE’s significance goes beyond its engineering feats, representing a critical step in integrating large-scale renewable power sources across regional grids. Quebec’s electricity supply is over 99% renewable, predominantly hydroelectric, offering a cleaner alternative to New York’s current generation mix, which still depends heavily on fossil fuels. By connecting these grids, CHPE could supply up to 20% of New York City’s electricity demand, reducing emissions and system costs by optimizing power delivery where it’s most needed.
Despite these benefits, the line’s early reliability issues highlight the technical and environmental challenges of deploying advanced transmission infrastructure. Drought conditions in Quebec could affect hydropower output, presenting a supply risk that must be managed. Furthermore, these start-up outages resemble problems experienced by other new interconnection projects, showing that full operational stability takes time to achieve.
What to watch next
The priority now lies in completing repairs and post-repair testing to restore CHPE to consistent service. Grid operators in New York have indicated they did not rely on CHPE this summer for maintaining grid stability but anticipate its role growing as reliability improves. Observers will be closely monitoring how the project performs during future demand peaks and how it navigates environmental factors like water availability impacting hydropower generation.
Beyond immediate operational concerns, stakeholders will assess how CHPE influences regional energy markets and emissions reductions over the coming years. Its success or setbacks could impact approaches to large-scale grid interconnections elsewhere, determining whether underground transmission lines become a more common solution for renewable energy integration in urban centers.