net zero

Short definition from Wiktionary

Adjective

1. 1
   Alternative form of net-zero.
2. 2
   Resulting in neither a surplus or deficit because gains and losses cancel out.
3. 3
   Of a building or system, generating as much energy through solar, wind, and other renewable resources as it uses from the electricity network.

Noun

1. 1
   Ellipsis of net zero greenhouse gas emissions; carbon neutrality.