The Pennsylvania Incentive Stack After 179D

For most of the last three years, a Pennsylvania commercial or industrial efficiency project could draw on four separate pots of money: a federal tax deduction, a utility rebate, a state grant, and the sale of alternative energy credits. As of 1 July 2026, it can draw on three.

The federal leg closed quietly, and a good deal of the guidance still circulating has not caught up. What follows is what each remaining leg is actually worth in Pennsylvania today, how the four interact where a project still qualifies for all of them, and the one clause — buried in a rebate application most owners sign without reading — that determines whether the credit leg survives at all.

1. 179D closed to new starts, but is still live for work already under way

The One Big Beautiful Bill Act (Public Law 119-21, § 70507, enacted 4 July 2025) added a new subsection to the Internal Revenue Code. Section 179D(i) reads in full:

This section shall not apply with respect to property the construction of which begins after June 30, 2026.

Three things follow, and the first is the one most often gotten backwards.

The test is begin construction, not placed in service. A retrofit that broke ground on 29 June 2026 and is commissioned in 2028 still qualifies. A retrofit placed in service in late 2026 but begun in July of that year does not. Because the subsection says "this section," it also ends the § 179D(f) retrofit alternative, not just the standard deduction.

The IRS has never defined "begins construction" for this purpose. Notice 2025-42, the begin-construction guidance issued after the Act, is expressly limited to §§ 45Y and 48E. The closest authority on point is Notice 2022-61, which says that for § 179D the IRS "will accept that installation has begun if a taxpayer generally satisfies principles similar to" the Physical Work Test and Five Percent Safe Harbor of Notice 2013-29, with the relevant facts and circumstances ultimately determinative. That is an analogy drawn from a different context, not a rule on point.

The practical consequence is that the documentation burden sits entirely with the taxpayer, and it sits there now rather than at filing. Anything a project can produce to fix its start date before 1 July 2026 is worth assembling while the records are fresh: dated notices to proceed and signed construction contracts, dated site photographs and daily logs showing physical work of a significant nature rather than preliminary activity, and invoices with proof of payment for costs incurred before the cutoff.

What it is worth where it still applies. For tax years beginning in 2026, the deduction runs $0.59 per square foot at 25% energy savings, rising $0.02 for each additional percentage point, capped at $1.19 (Rev. Proc. 2025-32, § 4.25). Where prevailing wage and apprenticeship requirements are met, the figures are $2.97, $0.12, and a $5.94 cap. For 2025 they are $0.58 / $0.02 / $1.16 and $2.90 / $0.12 / $5.81 (Rev. Proc. 2024-40).

One detail that most summaries get wrong: because the base amount and the per-point increment are indexed for inflation and rounded independently, the dollar cap binds before the savings percentage does. The maximum base deduction is reached at 55% energy savings in 2026 and 54% in 2025 — not the 50% figure that appears in a great deal of marketing material.

A second correction worth making, because it changes the modelling: for property placed in service in 2025 and 2026, the reference standard is ASHRAE 90.1-2007, not 90.1-2019 (Announcement 2024-24). Property placed in service from 1 January 2027 moves to 90.1-2019, a materially harder baseline. A project that began construction in June 2026 and is commissioned in 2027 should be modelled against both before anyone books the deduction in a pro forma.

2. The allocation route, where most of the remaining Pennsylvania value sits

Under § 179D(d)(3), a tax-exempt entity that owns the building can allocate the deduction to the person primarily responsible for designing the property. The building owner has no tax liability to shelter; the designer does.

The Inflation Reduction Act widened this considerably. The statute now defines a specified tax-exempt entity to include "any organization exempt from tax imposed by this chapter," so for property placed in service after 31 December 2022 the allocation route reaches private nonprofit universities, nonprofit hospitals and health systems, private K-12 schools and 501(c)(3)s — not only school districts, municipalities, authorities and state agencies. In Pennsylvania that is a large share of the buildings where deep efficiency retrofits actually happen.

Who counts as a designer is narrower than it first appears. Notice 2008-40 § 3.02 defines it as a person who creates the technical specifications for installation, and states expressly that "a person that merely installs, repairs, or maintains the property is not a designer." A design-build ESCO qualifies. A pure installation contractor does not.

The allocation letter is a formal document, not a courtesy. Notice 2008-40 § 3.04 requires eight specific items, including the cost of the property, the date placed in service, the amount of the deduction allocated, signatures from authorized representatives of both parties, and a declaration under penalties of perjury. It is worth noting that Notice 2008-40 was written for government-owned buildings and has never been updated for the IRA expansion, so the mechanics are being applied to a wider class of owners than the guidance contemplates.

3. Act 129 Phase V rebates

Phase V runs from 1 June 2026 through 31 May 2031, set by the Public Utility Commission's Implementation Order adopted 18 June 2025 at Docket No. M-2025-3052826. It covers PPL Electric, PECO, Duquesne Light and the four FirstEnergy Pennsylvania companies. For the rebate-versus-credit comparison in more detail, see PA utility rebates vs Tier II AECs and our utility rebates overview.

PPL Electric publishes prescriptive incentives at $0.10/kWh, custom at $0.15/kWh, direct discount at $0.20/kWh, and solar and CHP at $0.08/kWh.

PECO publishes prescriptive at $0.10/kWh, custom at $0.15/kWh, and small business interior and exterior lighting at $0.20/kWh. Its application manual gives measure-level ranges, and these are the ones that matter most to a project also considering credits: lighting at $2 to $65 per fixture or $0.40 per watt removed; HVAC at $40 to $1,800 per unit; variable frequency drives at $500 to $5,799 per unit; compressed air at $50 to $6,200 per unit; refrigeration at $20 to $2,000 per unit.

FirstEnergy Pennsylvania and Duquesne Light publish program lists but not rate cards or caps. We could not obtain current figures for either from a public source, and we are not going to estimate them. Both require a call to the program administrator.

Two caveats belong on all of the above. Phase V began three months ago, and published rate cards may still carry Phase IV values — confirm current-year figures with the utility before they go into a financial model. And there is a statutory ceiling on how long savings can be claimed: 66 Pa. C.S. § 2806.1(m) defines the Total Resource Cost test over "the effective life of each plan not to exceed 15 years." That is a plan-level cap inside a cost-effectiveness test, not a measure life. Each measure carries its own life in the Technical Reference Manual, and the two should not be conflated.

4. RISE PA

Reducing Industrial Sector Emissions in Pennsylvania is run by the Department of Environmental Protection's Energy Programs Office and funded by an EPA Climate Pollution Reduction Grant implementation award of $396,108,225.

It is operating and disbursing. DEP announced $267,825,172 across 31 manufacturing projects under the medium and large award tracks on 28 April 2026, and roughly $3.5 million to 15 small businesses on 10 August 2026, with additional funding rounds planned through 2029.

The structure runs in three tracks. The Small Award Track covers total project costs from $50,000 to $1 million at 50% cost share with a $500,000 maximum, administered by PennTAP at Penn State. The Medium Award Track runs from just over $1 million to roughly $66.7 million, with base grants from $300,000 to $20 million. The Large Award Track sits above that. Eligible sectors are NAICS 11, 21, 23 and 31–33, plus a list of named industrial process emitters. Eligible expenses run from 1 October 2024, and projects must complete by 1 April 2029.

Energy efficiency is explicitly an eligible technology, alongside electrification, industrial process and fugitive emissions reductions, fuel switching, on-site renewables and carbon capture. The guidance does not enumerate lighting, HVAC, motors or compressed air as named measures — projects are judged on facility-wide greenhouse gas reduction, which is the real screen. CHP eligibility is not addressed either way in the published guidance.

Every round is currently closed as of the end of August 2026, and the next windows have not been published. Anyone planning around RISE PA should be watching DEP's program page rather than assuming a window will be open when a project is ready.

One detail matters for the stack: DEP's programme FAQ states that a project "could include Act 129 or utility rebate program funding as part of the cost share requirement" where that funding is already secured and documented, and that there is no restriction on claiming the federal Investment Tax Credit in addition to RISE PA funding. The state grant does not, on its face, require a project to forgo the utility money.

5. Tier II alternative energy credits

The RY2025 weighted average was $26.92 per credit, against a $45 alternative compliance payment ceiling. Credits are issued per MWh of electricity generated or conserved under 52 Pa. Code § 75.63, and issuance begins on the date a complete application — including a meter or inverter reading — is filed with the administrator, under § 75.63(i).

The structural difference from the other three legs is worth stating plainly. A rebate is a cheque. A grant is a cheque. A tax deduction is a one-time reduction in taxable income. Tier II credits are recurring revenue across the measure's life. That is what makes registration worth the administrative effort even when the first-year figure looks modest next to a rebate — and it is also why the question in the next section matters more than its obscurity suggests.

6. How the four legs actually interact

### The attribute clause

PECO's commercial and industrial application manual contains the following:

As ordered by the Pennsylvania Public Utility Commission (PAPUC), any and all peak demand reductions from energy efficiency resources generated by the project described in this application will be retained by PECO to be bid into the PJM Forward Capacity Market (FCM). In addition, any and all energy savings or environmental credits generated by the project described in this application will also be retained by PECO.

On its face, that assigns the environmental credits from a rebated project to the utility. Three qualifications belong alongside it, and none of them makes the clause go away.

First, the statute is silent. 66 Pa. C.S. § 2806.1 contains no provision on the ownership of energy savings, environmental attributes or alternative energy credits. This clause is contractual, not statutory.

Second, the order it invokes appears to concern something narrower. The Commission's treatment of energy efficiency resources bid into the PJM capacity market addresses peak demand reductions. We could not locate any PUC order assigning environmental credits to an electric distribution company, and the extension from demand reductions to "energy savings or environmental credits" appears to originate in the utility's own drafting rather than in an order.

Third, coverage is uneven. The PPL terms we reviewed contain no equivalent clause. FirstEnergy's and Duquesne's current Phase V terms were not publicly available, so we cannot say what they contain.

The conclusion for a building owner is narrow and practical. This is per-utility contract language, not a statewide rule, and it is the single item most worth reading before signing a rebate application. Anyone planning to monetise credits from a rebated project should read the assignment clause in their own utility's current terms first — and, where the language is broad, resolve it in writing before the application goes in rather than after the credits have been modelled.

### Tax treatment

These are the questions to put to a tax adviser, not answers to rely on.

Section 136 excludes utility energy-conservation subsidies from gross income, but only for dwelling units. It does not reach a commercial retrofit, so a commercial rebate is not excluded from income on that basis. There is no § 179D-specific rule on how a commercial utility rebate affects the deduction, and the interaction runs through general tax principles rather than anything written for this purpose.

A state grant to a corporation is generally includible in gross income, because the TCJA-amended § 118(b)(2) excepts contributions by a governmental entity from the capital-contribution exclusion.

And § 179D(e) reduces the basis of the property by the amount of any deduction allowed. That one is independent of any rebate or grant, and it is the item most often missed on depreciation schedules.

### Sequencing

The four legs run on different clocks, and the ordering is where projects lose money rather than at any single deadline.

Rebate applications generally precede installation, and pre-approval is often a condition of payment. RISE PA runs on fixed windows and requires cost share to be secured and documented at application. AEC issuance begins at the complete application filing, so registration timing sets when the revenue starts — not when the equipment was installed. And 179D certification requires a field inspection by a qualified individual after the property is placed in service, which means the tax leg closes last even though it was decided first.

Where this leaves a Pennsylvania project

The federal leg has narrowed to work already under way, and for those projects the priority is documentary rather than strategic: fix the construction start date now, while the records still exist.

The other three legs are intact. Utility rebates remain the largest single cheque on most efficiency retrofits. RISE PA is real money for industrial projects, currently between rounds. And Tier II credits remain the only leg that pays across the measure's life rather than once.

Whether that last leg pays at all can turn on a clause in a rebate application signed months earlier. That is a solvable problem, but only before the signature, not after.

Emergent Energy Solutions evaluates Pennsylvania efficiency and distributed generation projects for Tier II AEC eligibility and handles PennAEPS enrollment, PJM-GATS registration and market sale. Submit a project for evaluation — no cost, response within two business days.

Sources

• 26 U.S.C. § 179D, including § 179D(i) as added by Pub. L. 119-21, § 70507
• IRS Rev. Proc. 2025-32 § 4.25 (2026 amounts); Rev. Proc. 2024-40 (2025 amounts)
• IRS Announcement 2024-24 (ASHRAE 90.1 reference standard table)
• IRS Notice 2022-61 (§ 179D begin-installation principles); Notice 2025-42 (45Y/48E only)
• IRS Notice 2008-40 §§ 3.02, 3.04 (designer definition, allocation letter)
• PA PUC Implementation Order, Docket No. M-2025-3052826, adopted 18 June 2025 (Act 129 Phase V)
• 66 Pa. C.S. § 2806.1(m) (Total Resource Cost test, 15-year plan cap)
• PECO Commercial & Industrial Application Manual; PPL Electric business incentives
• PA DEP RISE PA program page and programme FAQ; DEP announcements 28 April 2026 and 10 August 2026
• EPA Climate Pollution Reduction Grant award to the Commonwealth of Pennsylvania
• 52 Pa. Code § 75.63, including § 75.63(i); PennAEPS 2024/2025 AEC pricing

Frequently asked questions

Is the 179D deduction still available in Pennsylvania?

Section 179D(i), added by Public Law 119-21, § 70507, provides that the section does not apply to property the construction of which begins after June 30, 2026. Projects that began construction on or before that date remain eligible even if they are placed in service later; projects beginning construction after it are not.

Does a utility rebate stop a project from earning Tier II AECs?

It depends on the utility's own application terms, not on statute. 66 Pa. C.S. § 2806.1 contains no provision on the ownership of energy savings, environmental attributes or alternative energy credits. PECO's commercial and industrial application manual states that energy savings or environmental credits generated by the project will be retained by PECO. The PPL Electric terms we reviewed contain no equivalent clause, and FirstEnergy Pennsylvania and Duquesne Light Phase V terms were not publicly available.

Can Act 129 rebate money count toward the RISE PA cost share?

DEP's programme FAQ states that a project could include Act 129 or utility rebate program funding as part of the cost share requirement where that funding is already secured and documented, and that there is no restriction on claiming the federal Investment Tax Credit in addition to RISE PA funding.

When does Tier II AEC revenue start?

Credits are issued per MWh of electricity generated or conserved under 52 Pa. Code § 75.63, and issuance begins on the date a complete application — including a meter or inverter reading — is filed with the administrator, under § 75.63(i). Registration timing, not installation date, sets when revenue starts.