Estimate the Geothermal RECs your ground-source heat pump earns each year, and what they are worth.
| Verification segment, PJM GATS rule 4 | ||
|---|---|---|
| Fleet rated cooling capacity | BTU/h | |
| Nameplate = cooling capacity / 12,000 | ||
| Equivalent full load hours | ||
| Climate station of record · IECC zone | ||
| Annual HDD65 / CDD65 | deg-days | |
| Design dry-bulb, winter / summer · base | deg F | |
| Heating EFLH = HDD65 × 24 / |WDB − 65| | hours/yr | |
| Cooling EFLH = CDD65 × 24 / |SDB − 65| | hours/yr | |
| Estimated system size and capacity | ||
| Controlling envelope year · code of record | ||
| As-built envelope year, pre-code | ||
| SQFT per ton, code standard of record | sq.ft./ton | |
| Est. system size = SQFT / SQFT per ton | tons | |
| Capacity used = est. tons × 11,942.5 BTUh/ton | BTU/h | |
| Annual thermal demand | ||
| Heating season = heating EFLH × capacity used | mmBTU/yr | |
| Cooling season = cooling EFLH × capacity used | mmBTU/yr | |
| Delivered by system | mmBTU/yr | |
| Renewable methodology | ||
| COP heating / EER cooling (ISO 13256-1) | ||
| COP cooling equivalent = EER / 3.413 | ||
| Renewable fraction, heating / cooling | ||
| Renewable energy delivered | mmBTU/yr | |
| = renewable mmBTU / 3.413 | MWh/yr | |
| Revenue estimate | per year | |
Revenue is gross annual credit revenue before any Flett Exchange transaction fee, and assumes the system operates as designed for a full calendar year.
Credits have to be registered and certified before they can be sold. Flett Exchange handles registration, minting and trading for geothermal owners, with no long-term contract and no setup fee. Apply for an account and we will confirm your project's eligibility.
Flett Exchange GREC Calculator 2.0 · PJM GATS Appendix 5 Class 1 GEO methodology
Want to learn more about Geothermal RECs? Read our guide to Geothermal RECs
The Flett Exchange Geothermal REC Calculator estimates the Geothermal Renewable Energy Credits (GRECs) a ground-source heat pump earns each year, using the Virginia Class I geothermal method set out in PJM GATS Business Rules Appendix 5. It works through five steps, and your results and the PDF report show the figures behind every one.
It estimates how many Geothermal Renewable Energy Credits (GRECs) a ground-source heat pump system earns in a year, and what they could be worth at a GREC price you choose. Alongside that it shows the estimated system size, the thermal energy the system delivers, the renewable share of that energy, and every step of the derivation.
A Geothermal REC is a tradable credit for the renewable thermal energy a ground-source (geothermal) heat pump delivers. In Virginia, one GREC represents one megawatt-hour of renewable thermal energy. Electricity suppliers buy GRECs to meet the geothermal carve-outs in state Renewable Portfolio Standards, which is what gives them a market value.
It holds climate data for projects in Virginia, Washington DC, Maryland, Pennsylvania, New Jersey, New York, Ohio, West Virginia and Illinois. Virginia systems are estimated as Virginia Class I GRECs. Systems elsewhere run through the same method as a transparent credit basis for another programme; they do not earn Virginia RECs.
The placed-in-service date, the ground loop type, the town nearest the project, the conditioned floor area, the year the building envelope was built, the building type and foundation, and the heat pump make and model. If the model is not in the AHRI library you can type its rated capacities instead, or enter the system size in tons.
Yes. The calculator is free and there is no account to create. Enter your name and email address and your GREC Estimate arrives as a one-page PDF.
It is an estimate, not a meter reading. Credit volumes are modeled from climate normals, published building code sizing standards and rated equipment performance, so the credits a system actually earns depend on how it is registered, verified and operated.
Credits have to be registered and certified before they can be sold. Flett Exchange handles registration, minting and trading for geothermal owners, with no long-term contract and no setup fee. Apply for a GREC account and we will confirm your project's eligibility.