The trend for U.S. solar PV projects in the mid-size range (100 kW to 2 MW) has been changing considerably, from individual installations (on municipal or school buildings, for example) to multi-site projects. As opposed to previous single-site developments, project master plans now embrace the bigger picture, outlining the needs of an entire town, county, or school district. Typically, contracts cover everything from development to operations and maintenance of the system for up to 25 years, often with no cost to the host for installation.