They have remained a common approach for commercial electricity billing since then. (blog.aurorasolar.com)
For commercial electricity consumers, sourcing renewable power can lock in future savings from technologies whose fuel — wind, sun, water, biomass and the earth's heat — is free. (cleanenergycanada.org)
In the 1950s, nuclear power began to be used for commercial electricity generation as well as to drive submarines, navy ships and icebreakers, and people spoke glowingly of future nuclear - powered trains and aircraft. (newscientist.com)