The Energy Community Adder: Eligibility You Can Lose, and a Date That Locks It

The Energy Community Adder: Eligibility You Can Lose, and a Date That Locks It

September 17, 2026 · Dezzmond Team
Tax & Policy Policy & Regulation Bonus Adders Energy Communities

A developer can spend years changing a project and still have no control over the fact that creates its energy-community bonus.

The modules can change. The EPC price can change. The interconnection scope can change. The capital structure can change.

Then, without anyone touching the project, an IRS notice can change the answer.

That is because one of the main energy-community routes is tied to an area's unemployment rate relative to the national average. A location can qualify under one annual list and disappear from the next. The project has not moved. The tax map has.

The Inflation Reduction Act created the bonus in 2022 as a way to direct additional clean-energy investment toward places associated with the old energy economy: brownfields, communities with significant fossil-fuel employment or tax exposure, and census tracts affected by coal mine closures or coal-plant retirements. Treasury and the IRS then had to turn that policy into something a project could actually diligence.

Notice 2023-29 supplied the first operating rules. It defined the three original categories, explained how much of a project has to sit inside a qualifying area, and created a special beginning-of-construction rule that can freeze a favorable location status before the map changes.

The rule did not stay still after that.

Notice 2024-30 expanded the fossil-fuel employment codes and the attribution rule for certain projects. Notice 2025-31 had to deal with a more subtle problem: the statistical geography itself had changed after the 2020 Census, so Treasury began carrying two different "vintages" of MSA and non-MSA boundaries. Congress then amended the statutory definition in 2025 to add a separate route for certain advanced nuclear facilities. And Notice 2026-39 refreshed the statistical-area and coal-closure data again.

So by 2026, energy-community diligence is no longer "drop a pin on a map."

It is a time-stamped location analysis: which legal category, which statistical vintage, which IRS appendix, which project boundary, which beginning-of-construction rule, and which date?

For a large ITC project, getting that chain wrong can move the credit by tens of millions of dollars.

ℹ️ Note: This is a finance-oriented explanation of the federal energy-community rules. A real tax position depends on the applicable credit, project technology, site facts, beginning-of-construction facts and current IRS guidance.

Start With the Money: 10% Does Not Mean the Same Thing Under Every Credit

The shorthand "10% energy-community bonus" hides an important distinction.

For the production credits under §§45 and 45Y, the credit amount is increased by 10%.

For the investment credits under §§48 and 48E, the result is expressed in percentage points:

  • a project on the base ITC rate generally receives a 2-percentage-point increase; and
  • a project entitled to the higher rate — generally because it satisfies the prevailing-wage and apprenticeship requirements or another applicable exception — receives a 10-percentage-point increase.

For a §48E project with $250 million of qualified investment and a 30% credit rate:

Base credit                         30% × $250m = $75m
Energy-community increase           10% × $250m = $25m
Total with energy community         40% × $250m = $100m

That $25 million is why a map question becomes a financing question.

A tax-credit investor will underwrite it. A bridge lender may size against it. A sponsor may include it in sources and uses. If the qualification is wrong, the problem is not a footnote to the tax return; it is a hole in the capital stack.

The Original Policy Had Three Geographic Routes — and 2025 Added a Fourth, Narrow One

For most solar, wind and storage projects, the practical analysis still begins with the three categories created by the IRA:

Route What creates eligibility How it behaves
Brownfield Site-level contamination / brownfield status Fact-specific and generally durable once properly established
Statistical area Fossil-fuel employment or tax-revenue history plus a relative unemployment test Can change with annual data
Coal closure Census tract containing, or directly adjoining, a qualifying coal closure Historical-event based, but official datasets can be updated or corrected

Public Law 119-21 added a fourth statutory route for a qualified facility that is an advanced nuclear facility. For that limited category, an MSA can qualify based on at least 0.17% direct employment related to the advancement of nuclear power, including specified nuclear R&D, fuel-cycle and component-manufacturing activity.

That fourth route matters because a current article cannot say the Code now has only three categories.

But it does not replace the three-category framework used for ordinary solar, wind and BESS diligence. For those projects, brownfield, statistical-area and coal-closure analysis remains the working map.

Brownfield: The Category That Looks Simple Until You Read the Safe Harbor

A brownfield is not just "old industrial land."

The statutory definition comes from CERCLA. Broadly, the site is real property whose expansion, redevelopment or reuse may be complicated by the presence or potential presence of a hazardous substance, pollutant or contaminant, and it includes certain mine-scarred land. The statute also contains exclusions.

Notice 2023-29 created a safe harbor so a taxpayer does not have to build the position from first principles every time.

There are three routes into that safe harbor, not one.

A site can qualify if:

  1. it was previously assessed through a federal, state, territory or federally recognized Tribal brownfield resource as meeting the brownfield definition;
  2. an ASTM E1903 Phase II Environmental Site Assessment confirms the presence of a qualifying hazardous substance, pollutant or contaminant; or
  3. for a project with nameplate capacity of not more than 5 MW AC, an ASTM E1527 Phase I assessment identifies the presence or potential presence of a qualifying hazardous substance, pollutant or contaminant.

Notice 2023-45 clarified the third route. A small project does not get brownfield safe-harbor treatment merely because someone ordered a Phase I. The Phase I has to identify the relevant presence or potential presence.

That distinction matters in diligence.

For a utility-scale project, the Phase II route may be the practical path where the site has a credible contamination history. But the tax file should not reduce the analysis to "Phase II = energy community." The project must also deal with the CERCLA definition and exclusions, the parcel boundary, and the actual result of the assessment.

There is another useful point: the IRS FAQ treats the brownfield boundary as the entire parcel of real property whose redevelopment may be complicated by the relevant contamination. That can matter when a project occupies only part of a larger industrial parcel.

The financing lesson is simple. Environmental diligence can become tax-credit diligence. If the project is on former industrial land, the tax team should see the environmental reports before the financing model assumes the category is unavailable — or available.

Statistical Areas: The Category Where the Project Can Stand Still and the Answer Can Move

This is the route that creates most of the timing problem.

The statute defines a qualifying MSA or non-MSA through two limbs.

First, the area must have either:

  • had at least 0.17% direct employment related to the extraction, processing, transport or storage of coal, oil or natural gas at some point after December 31, 2009; or
  • had at least 25% of local tax revenues related to those activities, as determined by Treasury.

Second, the area must have an unemployment rate at or above the national average for the previous year.

The first thing to understand is that the unemployment test is not a county-by-county test, even though IRS appendices are displayed by county.

Treasury aggregates the labor force and unemployed population of the counties inside the relevant MSA or non-MSA and calculates the unemployment rate for that statistical area. A county appears on the list because of the status of the MSA or non-MSA grouping to which it belongs.

That distinction became more important in 2025.

The Geography Itself Changed

After the 2020 Census, MSA and non-MSA delineations changed.

Notice 2025-31 responded by carrying two statistical "vintages":

  • Vintage 1 — the older groupings generally tied to the 2010 Census; and
  • Vintage 2 — groupings generally tied to the 2020 Census.

A county may sit in a different grouping under the two vintages.

Notice 2026-39 continues to use both. A county or county-equivalent qualifies only where the fossil-fuel employment threshold and the unemployment test are both satisfied under the same vintage.

That is a small sentence with a large diligence consequence.

A model should not simply store:

County = Eligible

It should store something closer to:

County_FIPS
Applicable_MSA_or_nonMSA
Vintage_1_Status
Vintage_2_Status
Current_Notice
Effective_Date
Qualification_Route

Otherwise the file remembers the answer but loses the reasoning that produced it.

What Is Current in 2026?

Notice 2026-39 is the current annual statistical-area update as of this article's September 2026 review.

Its Appendix 1 uses 2025 unemployment data and 2023 County Business Patterns data. The listed statistical-area status became applicable June 9, 2026 and continues until Treasury and the IRS issue the next update based on 2026 unemployment rates.

The notice also says there were no new counties or county-equivalents meeting the fossil-fuel employment threshold in the relevant CBP update.

That does not mean the current eligible list is static.

The unemployment limb still moves.

An MSA can therefore leave the list even though its fossil-fuel history has not changed. The comparison is relative to the national unemployment rate, so movement can come from the area, the national benchmark, or both.

This is the part of the regime that makes a development schedule a tax variable.

The 25% Fossil-Fuel Tax-Revenue Limb Is Real — but Do Not Confuse It With the Published Employment Lists

The Code contains a separate route for an MSA or non-MSA with at least 25% of local tax revenues connected to the relevant fossil-fuel activities, combined with the unemployment test.

But Notice 2023-29 explained that Treasury faced data problems in operationalizing that limb and requested comments on possible data sources and procedures.

The annual IRS lists used in current diligence — including Notice 2026-39 — are built around the fossil-fuel employment route plus unemployment.

That means a current appendix lookup does not turn the statutory tax-revenue limb into a published safe answer. Treat the two concepts separately rather than assuming the annual employment list resolves every possible statistical-area theory.

Coal Closures: A Historical Event, but Not a Frozen Spreadsheet

The third legacy route starts with a physical historical event.

A census tract qualifies if it contains:

  • a coal mine closed after December 31, 1999; or
  • a coal-fired electric generating unit retired after December 31, 2009.

And the rule goes one step further: a census tract that directly adjoins the closure tract also qualifies.

"Directly adjoining" is broader than many people expect. Notice 2023-29 says boundaries can touch at a single point. So a tract that meets the closure tract only at a corner can still be directly adjoining.

That can materially widen the qualifying footprint.

The underlying closure event is durable. The data file, however, is not necessarily final.

Notice 2026-39 has two different coal-closure appendices:

  • Appendix 2 identifies newly qualifying closure and adjoining tracts based on updated MSHA and EIA data; and
  • Appendix 3 identifies tracts newly recognized because of location-data corrections. Those correction tracts can support eligibility back to January 1, 2023 for otherwise qualifying projects.

That creates a useful acquisition rule.

If an older tax memo concluded that a site was outside the coal-closure category, rerun it against the current appendices. A historical "no" can become a current "yes" because the underlying government data was corrected.

A Map Is a Screening Tool, Not the Tax File

Energy-community maps are useful because they turn thousands of FIPS codes and census tracts into something a development team can screen quickly.

But the IRS itself warns that the energy-community mapping tool cannot be relied on to substantiate a tax-return position.

So use the map to ask the question.

Do not use a screenshot of the map as the answer.

A defensible project file should identify, as applicable:

  • the site coordinates and parcel;
  • county FIPS code;
  • census tract number;
  • MSA or non-MSA;
  • Vintage 1 / Vintage 2 treatment for the statistical-area route;
  • the IRS notice and appendix relied on;
  • the effective period of that notice;
  • the qualifying coal closure or adjoining relationship;
  • brownfield evidence;
  • the project's nameplate-capacity or footprint calculation; and
  • the beginning-of-construction evidence if the project relies on lock-in.

That is what turns "the map was green" into something a tax-credit investor can underwrite.

What If the Project Crosses the Boundary?

A site does not have to sit entirely inside an energy community.

Notice 2023-29 gives projects two location tests.

If the project has nameplate capacity, it uses the Nameplate Capacity Test. At least 50% of the project's nameplate capacity must be in the qualifying area.

If the project has no nameplate capacity, it uses the Footprint Test. At least 50% of the project's square footage must be in the qualifying area.

For an ordinary solar or wind project, that can make layout a tax variable.

Consider a 200 MW project crossing a census-tract boundary:

Capacity inside qualifying tract       96 MW
Capacity outside                        104 MW
Energy-community percentage             48%
Result                                  FAIL

Revised layout:
Capacity inside qualifying tract       106 MW
Capacity outside                         94 MW
Energy-community percentage             53%
Result                                  PASS

If the project otherwise earns a 30% §48E rate on $250 million of qualified investment, that layout decision can be associated with a $25 million credit-rate increase.

That does not mean engineering should be distorted for tax reasons without considering interconnection, yield, land, environmental or EPC consequences. It means the tax boundary should be visible before the layout freezes, when there is still a real trade to make.

Notice 2024-30 also expanded the attribution rule for certain projects whose generation units are not themselves in an MSA, non-MSA or census tract. Offshore projects are the obvious case. That is a specialized branch, but it reinforces the same point: "where is the project?" is a defined tax question, not an intuitive one.

The Most Valuable Rule: Beginning of Construction Can Freeze a Moving Map

Without a special rule, the timing tests differ by credit.

For §§45 and 45Y production credits, energy-community status is generally tested separately for each taxable year of the ten-year credit period.

For §§48 and 48E investment credits, the location test is generally applied on the placed-in-service date.

Notice 2023-29 creates a special rule.

If an EC Project begins construction on or after January 1, 2023 in a location that is an energy community on its beginning-of-construction date, that location continues to be treated as an energy community for the relevant PTC credit period or the ITC placed-in-service test.

That changes the risk profile completely.

Before lock-in:

Current statistical-area status        PASS
Next annual IRS refresh                 Unknown
Adder assumption                        Exposed

After a qualifying BOC while the location is eligible:

Historical BOC status                  PASS
Later statistical-area refresh         Does not remove project status
Adder assumption                        Locked, subject to satisfying the rest of the credit rules

For a project in a moving statistical area, the BOC date can therefore be worth real money even when the physical site never changes.

2025 Created a Second Beginning-of-Construction Problem — Do Not Collapse the Two

This is where the current regime becomes easy to mis-model.

Public Law 119-21 accelerated the termination of §§45Y and 48E for applicable wind and solar facilities. For facilities that began construction after July 4, 2026, the wind/solar termination provisions generally deny the credit for facilities or relevant qualified property placed in service after December 31, 2027.

Notice 2025-42 then imposed a much stricter beginning-of-construction framework for purposes of that statutory wind/solar deadline. With a limited exception for low-output solar, the Physical Work Test is the method used to establish beginning of construction before the deadline.

The notice is explicit about its purpose.

That means a finance model should not casually assume that every reference to "BOC" across the tax rules is the same switch.

At minimum, separate:

EC_Lock_In_BOC
Wind_Solar_Termination_BOC
Domestic_Content_Threshold_BOC
Continuity_Test
PFE_MACR_BOC

Some of those dates may end up identical on a real project. Some may use related principles. But by 2026 the legal questions behind them are not interchangeable.

For wind and solar projects that missed the July 4, 2026 deadline, the first model question is now whether the project can satisfy the separate pre-2028 placed-in-service requirement. Only after the base §45Y/§48E credit survives does it make sense to value the energy-community increase.

And note the statutory exception: the wind/solar termination rule in §48E does not apply to energy storage technology merely because the storage is located at an applicable wind or solar facility. Storage still has its own eligibility and restriction analysis.

One More §48E Perimeter Issue: Interconnection Costs Can Be in the Credit Without Deciding the Location Test

The final §48E regulations separate the location perimeter from the credit-basis calculation.

Qualified interconnection property is not part of the qualified facility for purposes of deciding whether the facility satisfies the energy-community location requirement.

But qualifying interconnection expenditures can still be included in qualified investment when calculating the §48E credit.

That creates a modeling distinction:

Step 1 — Does the qualified facility / EST satisfy the energy-community location test?
Step 2 — If yes, apply the resulting credit rate to the qualified investment determined under §48E,
         including qualifying interconnection expenditures where the Code and regulations permit.

Do not use the interconnection corridor or substation footprint to manufacture location eligibility unless a specific attribution rule actually applies.

How I Would Build the Model

Do not bury the energy-community adder inside a single tax-credit percentage.

Give it its own schedule.

1. Legal and geographic inputs

Credit regime                        §48E
Technology                           Solar
County FIPS                          [input]
Census tract                         [input]
MSA / non-MSA                        [lookup]
Statistical vintage                  V1 / V2 / both
Current IRS notice                   Notice 2026-39
Current-list effective date          2026-06-09
Qualification route                  Statistical area

2. Location test

Qualifying capacity                  106 MW
Total project capacity               200 MW
Location percentage                  53.0%
Required percentage                  50.0%
Location test                        PASS

3. Timing

Current EC status                    PASS
EC lock-in BOC achieved?             YES / NO
EC lock-in BOC date                  [date]
Notice/list in force at BOC          [notice]
Wind/solar termination BOC test      PASS / FAIL / N.A.
PIS deadline test                    PASS / FAIL / N.A.

4. Credit value

Qualified investment                 $250.0m
Base / alternative §48E rate         30.0%
Energy-community increase            10.0%
Credit without EC                    $75.0m
Credit with EC                       $100.0m
EC value                             $25.0m

5. Downside cases

Run at least three:

  • current qualification locks before the next statistical refresh;
  • project reaches BOC only after a new list and remains eligible;
  • project reaches BOC only after a new list and loses statistical-area eligibility.

For a project that also has a possible coal-closure or brownfield route, run those independently. One category can save the position when another disappears.

The model should show why the flag is true, not just that it is true.

What a Tax-Credit Investor or Lender Will Actually Ask For

A serious diligence request will usually move from the map to the evidence.

Expect questions such as:

  • What is the exact qualification route?
  • Which IRS notice and appendix support it?
  • What was the applicable effective period?
  • If statistical-area based, which MSA/non-MSA and which vintage produce the answer?
  • If coal-closure based, what is the closure tract and what makes the project tract directly adjoining?
  • If brownfield based, which safe-harbor route is being used and what do the environmental reports actually say?
  • Does the project satisfy the 50% nameplate-capacity or footprint test?
  • If relying on BOC lock-in, what is the legal BOC theory and where is the evidence?
  • Is the model using the same BOC assumption for a different tax rule that actually has a different test?
  • What happens to tax-credit proceeds, sponsor equity and debt sizing if the bonus disappears?

That last question is the project-finance question.

An energy-community assumption is only useful after the model has shown what breaks when it is wrong.

The Story in 2026

The energy-community bonus began as a place-based incentive.

The first version of the story was straightforward: identify a brownfield, an old fossil-fuel community or a coal-closure tract, and reward a project built there.

Then implementation made the rule more interesting.

The unemployment test created a moving annual map. Census updates created two competing statistical geographies. Coal datasets required annual additions and corrections. Brownfield qualification became an environmental-diligence exercise. Beginning of construction became a way to freeze a location before the data changed. The 2025 legislation added a nuclear-specific fourth route and created a separate wind/solar beginning-of-construction problem that should no longer be casually merged with the energy-community lock-in analysis.

The project still sits on the same parcel.

What changes is the legal map around it.

That is why the right diligence question is not:

"Is this project in an energy community?"

It is:

"Under which category, under which dataset, under which project boundary, on which date — and what evidence will still prove that answer when the financing closes?"

Primary sources: IRS — Energy Community FAQ · IRS Notice 2023-29 and Notice 2023-45 · IRS Notice 2024-30 · IRS Notice 2025-31 · IRS Notice 2026-39 · IRS Notice 2025-42 · IRS final §45Y/§48E regulations · 26 U.S.C. §45