Harborough Solar One earns income from the installations through three sources:
- Solar electricity generated, which can be used directly by the host building, is sold to the building occupier under a long term agreement.
- Solar electricity generated, that cannot be used directly by the host building, may (depending on the project) be exported to the local electricity grid and sold to an electricity supplier.
- A subsidy called the Feed-in Tariff provides payments for every unit of electricity generated. The Feed-in Tariff is guaranteed for 20 years and increases annually with inflation.