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Solar Water Heater
Solar domestic water heating systems use roof-mounted solar collectors to heat water using the sun's energy. Connected to a backup storage tank water heater, hot water is always available.

Certain solar water heating systems installed in your Oregon home may be eligible for a Residential Energy Tax Credit.

RETC Qualifications

A​ solar domestic water heating system must meet certain qualifications to earn a Residential Energy Tax Credit​ up to $6,000 (credit taken over four years), depending on the system's first-year energy yield. See the RETC Rate Chart for more information.

Complete qualifications and instructions are outlined in the RETC Application.

Qualified solar water heating systems must:

  • Be installed or verified by an ODOE-certifie​d tax credit technician​.​
  • Meet the standards set by the Solar Rating & Certification Corporation Standard-300 system certification. Your certified installer can help you choose a model that meets the standards.
  • Be an appropriate model for the climate in which it will be installed (see climate zone map​).
  • Have a minimum Total Solar Resource Fraction (TSRF) of 75%. TSRF is the fraction of usable solar energy that your system should collect, based on shading, tilt, and orientation.

RETC Program Sunset

The RETC program ended on December 31, 2017. 

To qualify for a 2017 tax credit:
  • RETC devices must have been purchased by December 31, 2017;
  • Devices must be operational by April 1, 2018; and
  • ODOE must receive your application no later than June 1, 2018.
Solar photovoltaic​ applications must be initially input into PowerClerk​ by a tax credit technician on or before December 31, 2017.​​

If you plan to transfer your tax credit, ODOE must receive the pass-through application on or before June 1, 2018. Please review the RETC Administrative Rules for more information about program eligibility and requirements.​​


Ask your installing technician to complete the technical sections and the technician verification section in the RETC application. Your technician should also complete the Solar Site Assessment worksheet, which is attached to the application.

Complete the rest of the ​application, listing any other incentives you are receiving. Send it to the Oregon Department of Energy with a copy of your receipt listing the date, model, and price you paid for the system (minus labor and permits).​


Other federal, local, or utility programs may also offer incentives .

2016/17 Solar Water Heating RETC Application
2017 RETC Rate Chart ​​​​​​​​​​​​​

2016 RETC Rate Chart ​​​​​​​​​

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ Oregon Climate Zone Map ​​​​​​

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ Become an Approved Solar Technician​​​​

​​​​​​​​​​​​​​​​​​ RETC Administrative Rules​​​​​​

​​​​​​​​​​​​​​​ Incentives Ending in 2017 ​​​​​
​Contact the RETC Team: