Solar Calculator

Clean Power Estimator

Simple, easy to use calculator tool for California solar customers -- estimates customer payback and return on investment in solar systems

California Solar Initiative Incentive Calculators

Calculates expected performance of solar projects and establishes CSI design factor for use in CSI rebate applications

CSI-Thermal Calculator

Calculates solar thermal system performance for use in CSI-Thermal rebate application process

Solar Advantage Value Estimator (SAVE)

Estimates the present value of a solar photovoltaic (PV) system; providing a method to calculate the energy savings value of a solar system including the estimated value in annual energy savings. The California Energy Commission developed SAVE in response to expressed interest from real estate professionals, and other stakeholders. For more information, view the FAQs and SAVE Online Training Schedule.

PV Watts Calculator from National Renewable Energy Laboratory

Determines the energy production and cost savings of grid-connected photovoltaic (PV) energy systems throughout the world

Solar Advisor Model (SAM) from NREL

Comprehensive solar economic decision analysis tool. SAM makes performance predictions for grid-connected solar, small wind, and geothermal power systems and economic estimates for distributed energy and central generation projects

California Energy Performance Benchmarking for Commercial Buildings