PWA Requirements for Clean Energy Tax Credits

To create a robust market for well-paying clean energy jobs, the Inflation Reduction Act (IRA) radically transformed the economics of clean energy project development by introducing Prevailing Wage and Apprenticeship (PWA) requirements.

For developers, EPCs, and tax equity investors, PWA compliance is not just an administrative checklist—it is the key to unlocking project viability. Projects that comply with PWA requirements receive a tax credit that is five times greater than the base rate. Conversely, failing to meet PWA standards means forfeiting up to 80% of a project's total potential credit value.

Here is the definitive breakdown of what PWA compliance entails, which tax credits are impacted, and the specific thresholds developers must navigate.

The Two Pillars of PWA

PWA is divided into two distinct components: prevailing wage requirements and apprenticeship requirements.

1. Prevailing Wage Rules

‍All laborers and mechanics employed by the developer, contractors, or subcontractors must be paid a minimum prevailing wage specified by the U.S. Department of Labor (DOL). Prevailing wages must be paid during the construction of the facility, as well as during any alteration or repair work for a set number of years after the project is Placed in Service (PIS) (the number of years depends on the credit type**)**. It is important to note that workers do not have to be paid prevailing wages for basic maintenance work, which is “routinely scheduled and continuous or recurring.” Examples of basic maintenance are regular inspections of the facility, regular cleaning and janitorial work, regular replacement of materials with limited lifespans such as filters and light bulbs, and the calibration of any equipment.

2. Apprenticeship Requirements

‍The apprenticeship rules fall into three strict categories:

• Labor Hours: A specific percentage of total construction labor hours must be performed by qualified apprentices. For projects beginning construction in 2024 or later, this requirement is 15% (compared to 12.5% for projects started in 2023).
• Ratio Requirement: Contractors must adhere to daily apprentice-to-journeyworker ratios as prescribed by the associated registered apprenticeship program (the program that apprentices are sourced from).
• Participation: Any contractor or subcontractor employing four or more laborers or mechanics must hire at least one qualified apprentice.

Crucially, apprenticeship requirements do not apply after a facility has been placed in service. Post-PIS compliance applies only to prevailing wages for alterations and repairs.

Which Credits Are Subject to PWA?

Of the 11 clean energy tax credits eligible for transfer, 10 are subject to PWA requirements. The sole exception is the §45X Advanced Manufacturing Production Credit, which is entirely exempt from PWA rules.

PWA Exemptions: The BoC and 1 MW Thresholds

There are two primary ways a project might be exempt from PWA requirements entirely:

• Beginning of Construction (BoC): Projects that successfully established beginning of construction before January 29, 2023, are strictly exempt from PWA rules, except for §48C and §45Z credits.
• The 1 Megawatt (MW) Threshold: Under §45 and §48 (and their tech-neutral replacements, §45Y and §48E), projects with a maximum net output of less than 1 MW (measured in alternating current) are automatically exempt from PWA.

Quick Reference: PWA Duration by Tax Credit Type

Depending on the tax credit, prevailing wage requirements extend well into the operational life of the asset.

Because retroactive PWA compliance is exceptionally difficult and expensive, clean energy developers and EPCs must implement structured tracking from day one. By utilizing purpose-built compliance software and subject matter experts, developers can automatically flag noncompliance, cure underpayments, and secure bankable compliance reports that protect their 5x credit multiplier.

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