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Active Solar House.jpgActive solar space heating systems use solar energy to heat liquid or air, and transfer the solar heat directly to a home or to a storage system for later use. An auxiliary or back-up system typically provides additional heat. Active solar systems are used with radiant heating systems, boilers with hot water radiators, or to supplement forced air heating systems.

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

RETC Qualifications

​Active solar space heating in a home must meet certain qualifications to earn a Residential Energy Tax Credit​ up to $1,500, depending on how much energy is saved. See th​e RETC Rate Chart​ for more information.

Complete qualifications and instructions are outlined in the RETC Application. 

Active solar space heating systems must:

  • ​​Be verified by an Oregon Department of E​nergy certified tax credit technician.
  • Produce energy savings equal to at least 15 percent of the annual energy used for heating in your home.
  • 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 and the tilt and orientation of the collector.

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.
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, sun chart, and technician verification sections in the RETC application. Your technician should also complete the Solar Space Heating Sun Chart wo​rksheet, 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 and the price you paid (minus labor and permits).


Other federal, local, or utility programs may also offer incentives .
Photo credit: National Renewable Energy Laboratory, USDOE
​2016/17 Active Solar Space Heating RETC Application
2017 RETC Rate Chart ​​​​​​​​​​​​​

2016 RETC Rate Chart ​​​​​​​​​

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

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

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