This would be done by an electrical utility under a government energy policy, in a timescale negotiated between utilities and government.

Rental fees for these dark fibers (spares) can provide a valuable source of revenue for the electrical utility.

These falls supplied water power for several mills during the 19th century as well as a local electrical utility during the early 20th century.

For example, an electrical utility may produce less power on a mild day based on the correlation between electricity demand and weather.

Substations may be owned and operated by an electrical utility, or may be owned by a large industrial or commercial customer.