Customer contributions to RET are tax deductible and are used to purchase and install renewable energy projects, such as solar electric systems for community http://www.xcelenergy.com/Environment/Renewable_Energy/Solar/Responsible_Solar_Policy http://www.xcelenergy.com/Environment/Renewable_Energy http://www.xcelenergy.com/staticfiles/xe/Corporate/Corporate%20PDFs/RDFCurrent%20Funding%20Cycle_Projects.pdf http://www.xcelenergy.com/Environment/Renewable_Energy/Renewable_Development_Fund organizations that would otherwise be unable to afford the technology.