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Wind PTC Value Calculator

What is a wind project’s production tax credit worth? Set the size, capacity factor and bonus adders to see the 10-year credit stream under §45Y, using the IRS’s published 2026 rates.

Project

Capacity (MW)

Net capacity factor (%)

Placed in service Assumes the project starts operating January 1. The 10-year credit period runs from that date.

Construction began on or before July 4, 2026Required for wind placed in service after 2027 (the 2025 tax law’s deadline)

Credit qualifications

Prevailing wage & apprenticeship metMultiplies the base credit by 5 (0.6¢ → 3.0¢/kWh in 2026) Energy community bonus+10% of the credit Domestic content bonus+10% of the credit

Assumptions

Inflation after 2026 (%/yr)

Output decline (%/yr)

Transfer price ($ per $1)

Discount rate (%)

Transfer price is what a buyer pays per dollar of credit when it’s sold for cash under §6418.

Year-1 credit rate

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Year-1 generation

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Year-1 credit

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10-year credits

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Annual credit by year

How it’s calculated

Rate = 0.3¢/kWh × the IRS inflation adjustment factor, rounded to the nearest 0.05¢, × 5 if prevailing wage & apprenticeship rules are met. Each bonus adds 10% of that amount. IRS factors: 2025 = 1.9971, 2026 = 2.0570; later years grow at your inflation assumption.
Wind placed in service in 2025 or later claims the technology-neutral §45Y credit, which uses the same rate math as §45.
Under the 2025 tax law (P.L. 119-21), wind must begin construction by July 4, 2026 or be placed in service by December 31, 2027. Projects starting construction after 2025 also face foreign-entity (FEOC) sourcing limits, which this calculator doesn’t test.
Present value discounts each year’s credit to the placed-in-service date. It’s an illustration, not tax advice.

Sources: IRS 2026 inflation adjustment notice · CRS: The Production Tax Credit (2026)