One of the biggest developments in the U.S. residential solar photovoltaic (PV) market over the past few years has been the significant growth of residential solar PV systems not owned by homeowners. These are often referred to as third-party-owned systems.
Homeowners can contract with a company—sometimes called a solar leasing company, solar finance company, or third-party ownership company—to have a solar PV system installed on their rooftop (or elsewhere on their property). Depending on the agreement, the solar leasing company will often be responsible for financing, permitting, designing, installing, and maintaining the PV system.
Via Pol Bacquet