Utility services are under the control of several nationalized state enterprises that have developed since the Cuban revolution. Water, electricity, and sewage service are administered in this fashion. Electricity is supplied by generators that are fueled with oil. Much of the original power plant installations, which operated before the Revolutionary government assumed control, have become somewhat outdated. Electrical blackouts occurred, prompting the national government in 1986 to allocate the equivalent of $25,000,000 to modernize the electrical system.