RETScreen

This tool gives professionals and decision makers a way to rapidly identify, assess, and optimize the technical and financial viability of potential clean energy projects. This decision intelligence software platform also gives managers a way to measure and verify the actual performance of their facilities and helps find additional energy savings/production opportunities. RETScreen Expert, an advanced premium version of the software, is available in viewer mode completely free of charge.

This downloadable tool is offered by Natural Resources Canada, the Canadian equivalent of the U.S. Environmental Protection Agency (EPA). Data are from NASA's Prediction Of Worldwide Energy Resource (POWER) project.