net-ze·​ro | \ˈnet-ˈzē-(ˌ)rō, -ˈzir-(ˌ)ō\

Definition of net-zero 

: resulting in neither a surplus nor a deficit of something specified when gains and losses are added together net-zero carbon emissions The General Services Administration has sealed an unusual deal to guarantee achievement of net-zero energy consumption in a federal facility …— Charles S. Clark especially, of buildings : producing enough energy (as through solar panels or passive heating) to offset any energy consumed By 2020 all new homes built in California will have to be net-zero buildings that produce enough power to offset all their energy needs … — K. Kaufmann Another affordable, net-zero house is under construction in North Minneapolis, and a third is in development at the school. — John Cary

First Known Use of net-zero

1936, in the meaning defined above

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The first known use of net-zero was in 1936

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