"Commonwealth Solar The Commonwealth Solar II Rebate Program and the Commonwealth Solar Stimulus Rebate Program provide rebates through a non-competitive application process for the installation of photovoltaic (PV) projects. The Commonwealth Solar II Rebate Program provides rebates for commercial systems up to 5 kilowatts (kW) and all residential systems (regardless of size). The Commonwealth Solar Stimulus Rebate Program provides rebates for commercial PV systems sized greater than 5 kW up to 200 kW. Find out more here > Commonwealth Solar Rebate Program.