5. Discussion It is clear that given the existing financial parameters and taking into account various incentives and rebates, the net present costs of installing a solar PV array larger than 1 MW remain higher than the net present benefits, Every solar PV scenario evaluated yielded a negative NPV and higher COE compared to fossil fuels, making undertaking such projects financially infeasible. This is likely a contributing factor explaining the lack of solar PV arrays in the United States that are greater than 500 kW. Despite large areas of the United States having high solar potential, solar PV only accounts for 0.06% of total US installed electrical capacity (EIA, 2008). The results of the analyses highlight a need to continue offering rebates