The IRS and U.S. Department of the Treasury recently released the final regulations for the Investment Tax Credit (ITC) under Section 48 of the Internal Revenue Code. These final IRS regulations follow the proposed guidance issued in November 2023 and clarify critical rules for energy property eligibility, project definitions, and bonus credit considerations. For energy developers, project owners, and investors, these updates provide both welcome flexibility and areas of continued complexity. Here are the key highlights:

1. Qualified Interconnection Property

  • The 5 MW (AC) limitation remains measured at the energy property level rather than the overall project level.
  • Utility reimbursements no longer automatically disqualify interconnection costs for ITC eligibility. Instead, general income tax principles apply, offering flexibility in specific situations.
  • Interconnection property is excluded from prevailing wage, apprenticeship, domestic content, and energy community requirements.

2. Revised Single Project Determination

Responding to industry feedback, the final rules:

  • Replace the proposed “ownership plus two factors” test with a more flexible “ownership plus four factors” analysis, reducing unintended aggregation of separate energy properties.
  • Allow taxpayers to determine single project status at any time during construction or when properties are placed in service.
  • Decline to exempt mixed technology projects (e.g., solar plus storage) from aggregation, meaning combined property must jointly meet bonus credit requirements.
  • Clarify that a project is “placed in service” when its last energy property becomes operational.

3. The 80/20 Rule for Retrofits

The final regulations maintain strict application of the 80/20 rule, ensuring ITC eligibility only for significant retrofits. Additions or modifications to existing energy properties must meet the 80% threshold to qualify.

4. Updates for Qualified Biogas Property

Several improvements address industry concerns:

  • Gas upgrading equipment is now explicitly eligible for the ITC.
  • Flaring does not disqualify a property, provided the primary purpose is productive use or sale of biogas.
  • Ownership rules are relaxed, allowing separate ownership of biogas production facilities and collection systems.

5. Prevailing Wage and Apprenticeship Requirements for the 1 MW (AC) Exception

For energy properties generating direct current (DC) electricity, the final regulations allow taxpayers to calculate net output in alternating current (AC) by:

  • Using the lesser of the DC nameplate capacity or the nameplate capacity of the first AC inversion component.

Other properties, such as microgrid controllers and electrochromic glass, remain ineligible for the 1 MW (AC) exception and must comply with prevailing wage and apprenticeship requirements.

Additional Clarifications

The preamble to the final regulations confirms:

  • Energy storage technology qualifies for the ITC if Section 48 requirements are met, even when co-located with facilities eligible for other tax credits.
  • Prevailing wage and apprenticeship requirements outlined in Sections 1.45-7, 1.45-8, and 1.45-12 apply to ITC projects.

What This Means for Energy Stakeholders

The final IRS regulations strike a balance between certainty and flexibility, addressing industry concerns while upholding key compliance measures. For developers and owners, the changes offer:

  • Greater flexibility in determining project scope and interconnection costs.
  • Clarified eligibility for biogas systems and retrofitted properties.
  • Clearer timelines for single project determinations and bonus credit applications.

Given the complexity of these regulations, project stakeholders should work closely with tax and energy specialists to navigate compliance and maximize ITC benefits.

This article provides a general overview of the IRS Final Regulations. For tailored advice regarding your energy project, consult with a qualified tax advisor.