The agreement will add 800 petahash to Foundry USA mining pool's computing power, the companies said in a joint statement.
Two-thirds of the electricity at the site is sourced from zero-carbon sources such as nuclear power.
Union opposition helped kill a Senate-passed environmental bill in the New York Assembly to regulate crypto mining.
The power station that sparked controversy over a bitcoin mining expansion plan will also invest in renewable energy projects.
Greenidge's holding company announced the planned merger with Nasdaq-listed Support.com Monday.
Following a string of investments, miners are increasingly optimistic about prospects for the U.S. market in 2021.