What Alta Wind Means for Solar Owner-Operators

October 5, 2026 - The July 8 decision in Alta Wind has prompted renewed scrutiny of how renewable energy projects establish tax basis.  The case involved purchasers allocating the purchase price of completed wind projects among qualifying tangible property and other assets.  For vertically integrated developers that develop, build and own their own projects, the practical impact is narrower than the headline suggests.  For owner-operators, Alta Wind changes less about which project costs are eligible than about how those costs must be documented and substantiated.

That matters most for in-house development and construction costs, which often appear on project budgets under a label such as "allocated SG&A."  Salaries, independent contractor and legal fees, insurance, engineering, project management, supervision and support costs are not ordinary corporate overhead when they are incurred to develop and construct a developer's own projects.  Section 263A generally requires properly allocable indirect development and construction costs to be capitalized, and Alta Wind illustrates the importance of identifying, quantifying and substantiating those costs when they are used to support eligible basis.

How the credit is calculated

The investment tax credit (ITC) equals a percentage of the "basis" of the qualifying equipment - generally 30 percent for projects entitled to the increased credit rate, with potential bonus amounts for projects that satisfy domestic-content, energy-community or other applicable requirements.  For a developer that builds and keeps a project, basis is what it cost to build: the panels, racking, inverters, wiring and installation, together with the design, permitting, engineering and project management required to deliver the project, whether performed by outside firms or by the developer's own staff.

When a completed project is sold to a tax equity partnership, the purchaser takes a cost basis, and the purchase price is allocated among qualifying tangible assets and other property.  That was the setting in Alta Wind.  Because a finished, permitted, interconnected project may be worth more than the sum of its invoices, that price usually exceeds the developer's cost.  The difference is the "step-up," which is supported by an independent appraisal.  A cost segregation study then sorts the total among equipment that qualifies for the credit, property that does not, and intangible assets such as contracts and permits.

In-house work is project cost when it is related to the project

The principle is the same whether the work is performed by a third-party contractor or by the developer's own team.  An EPC contract price includes the contractor's project managers, engineers, supervisors, back-office support and insurance, plus a margin, and every dollar of that price counts toward the project's cost.  When a vertically integrated developer performs those functions itself, the cost runs through its own payroll, independent contractor, legal and insurance accounts rather than an EPC contractor's invoice, but the work is the same and the cash is spent just the same.  Tax law recognizes this and requires the developer to capitalize that share of its costs, so that a company that builds its own projects is not treated worse than one that hires them out.

That is why the line should be understood by the underlying activity, not the accounting label.  Depending on the nature of the activity and the property benefited, capitalizable indirect costs may include the allocable portion of salaries and payroll burden, independent contractor fees, legal fees, insurance, engineering, project management, permitting, interconnection and other support functions tied to a specific project.  Those costs still must be properly allocated to qualifying property.  Selling, marketing and financing costs stay outside project basis either way.

For a developer whose business is building the projects it owns, most of the cost of running the business goes into producing them.  The Section 263A regulations count independent contractors as labor, the same as employees.  They also permit that cost pool to be allocated among projects by any reasonable, consistently applied method, such as each project's time in active development.  The result need not be uniform: a project that spent years in development, and is more complex than most projects, and, therefore, absorbed a disproportionate share of the team's time can support a larger share of the pool.  Where the method would support an even larger allocation, a conservative course is to cap the amount capitalized and expense the excess.

What the court decided

Alta Wind arose from the sale of six California wind farms at prices well above construction cost, in part because the prices reflected the cash grants the buyers expected to receive.  The buyers claimed more than $703 million in grants on the full price; Treasury paid about $495 million; the dispute ran for thirteen years.  The July 8 decision by the Court of Federal Claims addresses how the price should be allocated on the evidentiary record, in four principal respects.

   1. The anticipated Section 1603 cash grant could not simply be reflected back into the value of the tangible property used to calculate the grant.  The buyers' cash flow model treated the expected grant as revenue of the wind farms, which raised the value, which raised the grant.  The court rejected that approach because the buyers had not shown that the grant-derived value belonged to the qualifying tangible assets rather than to separate intangible value.  While Alta Wind concerns the historical Section 1603 cash grant program, the same reasoning should apply to the ITC – the anticipated credit cannot be reflected in the value of the tangible property used to calculate the credit. 

   2. On this record, the court found a modified cost approach more persuasive.  The court relied on actual construction costs, added the development fee and construction-period interest as indirect costs, and applied a market developer profit drawn from comparable transactions - 15 percent for one project and 20 percent for the others.  Cash flow models are not categorically barred, but the court rejected the buyers' model because it did not adequately segregate grant-derived value from the value of qualifying tangible property.  In our experience, post-decision reports from two national appraisal firms reach a 25 percent premium by blending the income and cost approaches and note that insurers cap value at 20 to 30 percent above cost, most at 25 percent.  

   3. Developer profit may be reflected in fair market value when it is supported by market evidence.  The court rejected the government's 9 percent figure from a financial model and accepted the appraiser's comparable-transaction range.  It declined a separate "turnkey premium" because the construction contractors, not the developer, carried the risk of delivering a working plant.

   4. Categories are not costs.  The buyers claimed $157 million of "Development Rights" - including permits, wind data and milestones described in general terms.  The court agreed that certain development costs can be capitalized in principle, but excluded the claimed amount because the record did not sufficiently identify the constituent activities, establish their relationship to the tangible property, and quantify the amounts attributable to each.  For an owner-operator, that puts the emphasis squarely on the quality of the cost record.

How capitalized indirect costs should be documented

From a lender, tax equity or audit perspective, the question is not whether a budget contains a line for in-house costs.  It is whether the developer can show what is underneath that line and how the amount was allocated.  Where most of the costs under that line are payments to independent contractors, outside counsel and insurers, much of the record already exists.  A strong record includes:

• A written capitalization policy identifying which in-house development and construction functions are capitalized and which corporate functions are excluded;
• Records showing employee and contractor effort attributable to individual projects, or dated project milestones where costs are allocated by time in development;
• Source documents for each component of the cost pool - Forms 1099 and invoices for independent contractors, invoices from outside counsel, insurance policies and premium invoices, and payroll records for employees;
• General-ledger support that reconciles the allocated amount to actual company expenses, booked while the project is being built rather than when the cost seg report is being prepared;
• A project-level schedule showing the cost pool, the allocation method and the amount capitalized to each project, itemized by function, noting any allocated amount that was expensed instead;
• Consistent application of the method across the portfolio; and
• Controls against double counting, including between capitalized indirect costs and any separately charged development fee.

On the value side, where a taxable acquisition creates a step-up above historical cost, the independent appraisal will explain the valuation methodology, avoid attributing unsupported incentive-derived value to qualifying tangible property, and support any developer profit with market evidence.  

What this means for lenders and investors

Presented this way, the in-house line is not an unsupported markup added to project cost after the fact.  It is a schedule of actual indirect development and construction expenses incurred by the developer and capitalized under a documented method.

Alta Wind reinforces a straightforward diligence framework: start with actual project cost and require an audit trail.  A lender should be able to trace the capitalized amount from the project budget to the allocation schedule, from the schedule to the general ledger and its source documents, and from there to the work performed on the project.  For projects sold to a tax equity partnership, any step-up above actual cost must be independently supported.  Alta Wind supports the proposition that developer profit may be reflected in fair market value when supported by credible market evidence.  As noted above, insurers generally treat a premium of roughly 20 to 30 percent over cost as the defensible range, with most at 25 percent.  Expect the same standard to reach audits of today's credits and the credit transfer market; an appeal to the Federal Circuit remains possible.

Conclusion

Alta Wind favors documentation over labels.  For a developer that builds what it owns, the decision lands closer to existing practice than the headline suggests: it rewards knowing what a project cost and being able to show it, and it rejects unsupported allocations of incentive-derived value to qualifying tangible property.  Properly supported capitalized indirect costs remain part of the project's cost basis and can be underwritten like any other documented project cost.

 

This article is for general informational purposes and reflects our reading of the Court of Federal Claims' July 8, 2026 decision in Alta Wind I Owner Lessor C v. United States and related commentary.  It is not tax or legal advice.  Project owners and investors should consult qualified counsel and tax advisors about how the decision applies to specific projects and transactions.