Most commercial efficiency projects in Pennsylvania capture a utility rebate and stop there.
The rebate is real money and it arrives fast. But it is a one-time capital offset against a measure that will keep saving electricity for another decade. That ongoing reduction is separately monetizable under Pennsylvania's Alternative Energy Portfolio Standard, and the documentation the rebate application already produced supplies most of what the AEC application needs.
Two programs, one project, one body of engineering work.
The Two Mechanisms
They are unrelated regulatory regimes and it is worth being precise about that, because the differences drive the sequencing.
Utility rebates are administered by the electric distribution companies under PUC-approved plans. PECO, PPL, and FirstEnergy each run prescriptive tracks paying per-unit on defined measures and custom tracks paying against modeled or measured savings. The incentive is paid once, against project cost.
PA Tier II Alternative Energy Credits (AECs) are issued under Act 213 and 52 Pa. Code Chapter 75. Under § 75.63, a credit is certified for each MWh of electricity generated or conserved by a qualified alternative energy system or demand-side management measure. One AEC per MWh, issued for as long as the measure remains certified and verifiable.
The rebate compensates you for making the investment. The AEC compensates you for the electricity the investment continues not to consume.
Why the Documentation Overlaps
This is the practical reason the two belong together.
A custom rebate application requires a savings calculation — connected load before and after, operating hours, and a defensible methodology. On most custom tracks that calculation is reviewed by the utility's implementation contractor or a third-party evaluator before the incentive is paid.
A PennAEPS application requires substantiating that a measure exists, operates as described, and produces a verifiable electricity reduction.
Those are largely the same evidentiary package. The rebate file typically contains:
- The savings calculation, with methodology
- Equipment specifications and quantities
- Pre- and post-installation conditions
- Third-party review of the savings figure
- Commissioning or completion documentation
An organization that has already run a custom rebate filing has done most of the work required for AEC certification and generally does not know it.
Sequencing — and Why It Is Not Symmetrical
The two programs impose different timing constraints, and this asymmetry is the single most important thing to understand.
Rebates are gated at the front end. Most custom tracks require pre-approval before construction begins. File after the equipment is installed and the incentive is generally forfeit. That window closes permanently.
AECs are gated at certification, not installation. Under § 75.63, credits are issued from the PennAEPS certification date forward. Prior operation does not produce credits. A measure installed three years ago and certified today generates AECs from today forward over its remaining useful life — it does not generate credits for the three years already elapsed.
The consequence:
| Program | Miss the window | Recoverable? |
|---|---|---|
| Rebate | Filed after construction starts | No — the incentive is forfeit |
| AEC | Certified late | Partially — issuance begins at certification; elapsed years are gone |
Neither is retroactive. But a missed rebate is a total loss, while a late AEC certification costs only the interval.
That makes the correct order clear: engage before construction, secure the rebate pre-approval, then carry the same documentation into certification once the measure is operating and verifiable.
What This Looks Like on a Real Measure
Take an LED and VFD retrofit at a distribution warehouse — the measure type most commonly filed under custom rebate tracks.
Suppose the project reduces annual electricity consumption by 3,200 MWh, verified through the rebate application's savings calculation.
The rebate. Custom incentive rates vary by utility and program year; check the current program-year documentation for applicable per-kWh values and caps. For a project of this scale the incentive is a material offset against project cost, paid once.
The AECs. 3,200 MWh conserved produces 3,200 AECs annually (one AEC per MWh, § 75.63).
| Price | Annual AEC revenue |
|---|---|
| $23.00 recent spot | $73,600 |
| $26.92 RY2025 weighted average | $86,144 |
Over a ten-year measure life, roughly $736,000 to $861,000 — from the same retrofit that already earned the rebate.
The rebate improved the project's economics at the front end. The AECs are revenue the project generates afterward, and they are the part most facilities never claim.
For the full worked model, see the warehouse LED and VFD model on our PA Tier II AEC site.
Which Measures Work for Both
The overlap is broad but not universal. A measure needs to produce a verifiable reduction in electricity consumption to generate AECs, which excludes some rebate-eligible work.
Both programs:
- LED lighting retrofits with controls
- Variable frequency drives on motors, fans, and pumps
- Compressed air system optimization — leak repair, sequencing, pressure optimization
- High-efficiency HVAC replacement
- Chiller plant optimization
- Refrigeration controls and retrofits
- Building automation upgrades producing measurable electricity reduction
Rebate but generally not AEC:
- Gas-fired equipment replacement — reduces therms, not kWh
- Measures where the electricity reduction cannot be isolated and verified
- Fuel-switching that moves load onto the electric meter
That last category deserves attention. A gas-to-electric conversion can reduce total site energy and cost while increasing metered electricity consumption. Under § 75.63 the credit basis is electricity generated or conserved, so such a project may earn a rebate and generate no AECs. Ground-source heat pump retrofits replacing gas heating are the common case — see when a geothermal retrofit conserves electricity.
What Happens After Certification
The AEC side does not end at approval. Once certified, a facility receives a certification number, a PJM-GATS generator account is established, and generation or savings data is entered monthly to create credits.
Those credits then have to be sold. Tier II is not exchange-traded — there is no screen price. Value depends on finding buyers, and a single facility with a few thousand credits has limited visibility and limited leverage.
That ongoing work — monthly GATS reporting, certificate management, market timing, and sale — is what an aggregator handles.
Where We Fit
We are a registered Trade Ally across PECO, PPL, and FirstEnergy territories, which means we prepare and file rebate applications directly with the utilities under their program rules.
We also register and monetize PA Tier II AECs through PA S-RECs, our Tier II aggregation practice.
The sequence we run:
- Pre-construction review. Identify which rebate track applies and secure pre-approval before the window closes.
- Rebate filing. Prepare and submit the application, including the savings calculation and supporting documentation.
- AEC eligibility review. Assess the same measure against § 75.63 and confirm who holds the environmental attributes — under § 75.13(i) the default favors the customer-generator, but a PPA, energy services agreement, or ESCO contract may have assigned them.
- PennAEPS certification. Prepare the application using the rebate documentation as the evidentiary base. Under § 75.64, the administrator provides written notice of the qualification decision within 30 days of receiving a complete application.
- GATS registration and ongoing management. Monthly reporting, certificate creation, sale, and settlement.
Steps 1 and 2 are the ones with a hard deadline. If a project is already in construction, step 1 has passed — but steps 3 through 5 remain fully available, and a completed project with rebate documentation on file is the easiest kind of AEC application to prepare.
Frequently Asked Questions
Does claiming a utility rebate affect AEC eligibility?
No. They are separate programs with separate mechanics. The rebate is a capital cost offset; the AEC is issued against the verified electricity reduction. Claiming one does not preclude the other.
Can a completed project still generate AECs?
Yes, where the measure remains operational and verifiable. Certification is available for measures with remaining useful life. Issuance begins at certification rather than at installation, so a project completed earlier generates credits from certification forward over the remaining life of the measure.
What if no rebate was claimed?
AEC eligibility does not depend on a rebate. Without one, savings substantiation comes from engineering calculation against the equipment specifications, supported by pre- and post-installation utility data. It is more work than reusing a rebate file, but the pathway is the same.
Who owns the AECs on a project financed through an ESCO?
52 Pa. Code § 75.13(i) provides that a customer-generator eligible for net metering owns the alternative energy credits of the electricity it generates, unless a contract expressly assigns ownership elsewhere. The default favors the host, but the contract governs. Read the agreement before preparing an application.
How long does the AEC revenue continue?
Over the measure's remaining useful life, subject to continued verifiability and the ongoing reporting obligations that attach to a certified facility.
Start Before Construction
The rebate window closes when construction begins. The AEC pathway stays open, but every month uncertified is revenue the measure will not produce again.
Send us the project — planned or completed — and we will tell you which programs apply.
