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The utility also would build an electrical switch yard nearby to deliver power to the grid, the company’s preliminary environmental assessment said.

Indian Point 3 was shut down for a time in July after a water pump problem, and in June because of an electrical disturbance at a switch yard outside the plant.

A maintenance failure at an APS switch yard near Yuma, Arizona, led to the blackout.

Contractors at the plant have completed construction of an earthen berm around the plant's switch yard and are protecting the plant and other facilities with large temporary structures filled with water.

“There are some savings from the control system, the switch yard, some of the interconnections,’’ Mr. Browning added.