The attorney general’s office and Entergy have each signed off on the agreement, but the governor’s office has indicated to the other parties that the administration will wait until Monday to sign it, the person said. The deal has shifted several times during negotiations, but the person said all that remained to complete it was an administration signature.

Nonetheless, Richard Azzopardi, a spokesman for Mr. Cuomo, said that nothing was final. “There is no agreement — Governor Cuomo has been working on a possible agreement for 15 years and until it’s done, it’s not done,” he said. “Close only counts for horseshoes, not for nuclear plants.”

Mr. Schneiderman’s office has opposed Entergy’s relicensing bid in the courts, arguing that the plant poses safety and environmental hazards to the surrounding area. The agreement calls for Mr. Schneiderman to drop that challenge.

Under the agreement with the state, the person with knowledge of it said, Entergy has committed to applying for a six-year renewal of the licenses, which were scheduled to expire in 2013 and 2015. The agreement may help clear the way for approval.

But a six-year renewal would be a first, a spokesman for the Nuclear Regulatory Commission said. He said no nuclear plant license had ever been renewed for less than 20 years.

The agreement would also require Entergy to establish an emergency operations center in Fishkill, in Dutchess County, and to create a $15 million fund to finance projects related to environmental protection and other community benefits. Entergy would be obligated to consult regularly with Riverkeeper and other local groups.

The agreement also provides for flexibility if the state cannot find a replacement for Indian Point’s energy: The deadlines in 2020 and 2021 can be delayed to 2024 and 2025 if the state and Entergy agree.