Ground-Source Heat Pumps and PA Tier II AECs
Ground-source heat pump retrofits may generate PA Tier II AECs where they conserve electricity. Whether they do depends on the baseline being displaced — see the worked models and the fuel-switching analysis. AECs are issued forward from PennAEPS certification, based on verified MWh of electricity conserved.
Why Geothermal Systems Excel for Tier II RECs
High kWh Reduction Potential
Ground-source heat pumps replace resistance heating, gas heating, and inefficient cooling with a single high-COP system. Where the baseline is electric resistance or older air-source equipment, MWh savings per square foot are among the highest of any Tier II-eligible efficiency measure.
Long Useful Life
Ground-source heat pump systems are long-lived assets and typically generate AECs over the measure's remaining useful life.
Illustrative Revenue Modeling
For a hypothetical 80,000 sq ft commercial building modeled at 400 MWh/yr of verified savings and RY2025 weighted-average pricing, annual AEC revenue would be roughly $10,800/yr. Actual revenue depends on measured savings and market pricing at time of sale.
Stack with Utility Rebates
PA utility rebates (PPL, PECO, FirstEnergy under Act 129) and PA Tier II AECs are separate programs. A geothermal project can pursue both.
Qualifying Geothermal System Types
Closed-Loop Vertical
Bore holes with ground heat exchangers — most common for commercial
Closed-Loop Horizontal
Horizontal ground loops for facilities with available land area
Open-Loop / Standing Column
Groundwater-based systems using wells or standing column wells
Hybrid Geothermal
GSHP combined with cooling towers or boilers for peak loads
Revenue Examples by Facility Size
Facility
40,000 sq ft (illustrative)
Annual Savings
200 MWh/yr
Annual RECs
$5,384/yr
Lifetime (illustrative)
$80,760
Facility
80,000 sq ft (illustrative)
Annual Savings
400 MWh/yr
Annual RECs
$10,768/yr
Lifetime (illustrative)
$161,520
Facility
120,000 sq ft (illustrative)
Annual Savings
600 MWh/yr
Annual RECs
$16,152/yr
Lifetime (illustrative)
$242,280
Illustrative model at RY2024–25 weighted-average pricing of $26.92/AEC (source: PennAEPS). Modeled over the measure's remaining useful life; actual revenue depends on measured MWh conserved and market pricing at time of sale.
Maximize Your Geothermal REC Revenue with Energy Monitoring
Installing energy monitoring equipment on your geothermal system provides real-time verification of energy savings — the strongest possible evidence for your REC application. Submetering the heat pump compressors, ground loop pumps, and supplemental heating shows exact kWh reductions compared to baseline.
Submetered data supports the measurement and verification package that PennAEPS reviews at certification. Approval outcomes and credit volumes are determined by the program administrator; documented M&V strengthens the record supporting a certification decision.
Calculate Your Geothermal REC Revenue
Submit your geothermal project details for a custom evaluation. We'll estimate your annual REC revenue and total lifetime value.
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