Electricity generation businesses produce electrical power for supply to homes, businesses and public services. They may operate large power stations or smaller generating facilities, using sources such as wind, solar, hydroelectricity, nuclear energy, biomass or gas. Some generate electricity for export to the wider network, while others supply a particular site, community or industrial process. Their work can include developing projects, arranging finance and permissions, installing equipment, and operating and maintaining generating assets. Customers and organisations working with generators may deal with them through power purchase agreements, direct supply arrangements or contracts for electricity from particular sources. Generation businesses also monitor output, plan maintenance and manage the practical requirements of connecting equipment to the electricity network.