Merits of a power line from Quebec are debated

On paper, the proposal looks fairly straightforward: a 330-mile underground power line that would carry electricity generated by hydropower in Quebec, one of the cheapest power markets in North America, to New York City, one of the most expensive.

The transmission line would help cut air pollution in the city, by reducing the need to burn natural gas locally, proponents say. And the metropolitan region would be less reliant on the Indian Point nuclear plant, which Gov. Andrew M. Cuomo, a Democrat, wants to close.

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