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All Renewable Thermal Generation Units must:
A ground source heat pump uses compression and evaporation to transfer thermal energy from the ambient underground or water environment to a thermal load as Useful Thermal Energy. There are several requirements in order for ground source heat pump Generation Units to be eligible. For a list of eligibility requirements, please see the APS regulations, beginning on page 20. Please note while utilizing ground source heat pumps for cooling is allowed, only the Useful Thermal Energy used for heating is eligible to generate AECs.
To submit a Statement of Qualification application (SQA), please visit the APS Renewable Thermal Application Portal.
For more information on renewable thermal in the APS, please visit our APS Statement of Qualification webpage.
Size Classification and Multipliers
The size classifications for ground source heat pump Generation Units are as follows:
Ground source heat pump
Output capacity less than or equal to 134,000 Btu per hour
Output capacity between 134,000 and 1,000,000 Btu per hour
Output capacity greater than or equal to 1,000,000 Btu per hour
The multipliers for ground source heat pump Generation Units are as follows:
In addition to the above multipliers, any ground source heat pump installed in a building shall be eligible for an additional multiplier of 2 (added to the base multiplier) if the building meets any of the following criteria:
More information on these multipliers can be found in the Guideline on Multipliers for Renewable Thermal Generation Units.
All small ground source heat pump Generation Units are subject to the following eligibilty criteria:
Small GSHP System Type
Cooling Energy Efficiency Ratio*
Heating Coefficient of Performance**
Closed Loop Water to Air
Open Loop Water to Air
Closed Loop Water to Water
Open Loop Water to Water
*EER = (full load EER + part load EER)/2
**COP = (full load COP + part load COP)/2
More information on these criteria can be found in the APS regulations, beginning on page 20.
Small ground source heat pump Generation Units are eligible for preminting, which allows the owner to receive 10 years of AECs upfront. After reviewing and approving the application for the Generation Unit, DOER will calculate the 10 year strip of AECs to be minted. The calculation is as follows:
More information on this calculation can be found in the Guideline on Metering and Calculating the Useful Thermal Output for Renewable Thermal Generation Units – Part 1 (Calculations for Small and Intermediate Generation Units).
All small ground source heat pump Generation Units are required to submit the following in their Statement of Qualification Application:
Intermediate and large ground source heat pump Generation Units will receive AECs, based on their metered production, on a quarterly basis. Generation Unit owners should review the Guideline on Metering and Calculating the Useful Thermal Output for Renewable Thermal Generation Units – Part 2 (Metering for Intermediate and Large Generation Units) for information on metering requirements.
All intermediate and large ground source heat pump Generation Units are required to submit the following in their Statement of Qualification Application: