Here’s something that bugs me about how most facility managers approach energy tax credits. They default to solar. Every single time. And look, solar is great, but Section 48 of the Internal Revenue Code covers a lot more ground than rooftop panels, and two of the most overlooked qualifying technologies are combined heat and power systems and microgrid controllers.
If your building already generates its own electricity and captures waste heat, or you’ve sunk capital into microgrid infrastructure that keeps the lights on when the utility grid goes sideways, you might be sitting on a credit worth hundreds of thousands of dollars. Possibly more.
CHP Systems And Why They Qualify Under Section 48
Combined heat and power (also known as cogeneration) is exactly what it sounds like. You generate electricity on-site, and instead of venting the waste heat into the atmosphere like a conventional power plant would, you capture it. Route it into steam loops, absorption chillers, industrial heating. Hospitals do this. So do university campuses and manufacturing facilities with heavy thermal loads.
Now, for a CHP system to qualify under Section 48, specifically, a qualifying CHP system generally must produce at least 20% of its total useful energy as qualifying thermal energy and at least 20% as electrical or mechanical power. Its overall energy efficiency percentage must also exceed 60%.
The base ITC rate is 6%. Not exactly thrilling on its own. But satisfy the prevailing wage and apprenticeship requirements baked into the Inflation Reduction Act, and you’re looking at 30%. On a $4 million CHP installation, that’s the difference between a $240,000 credit and a $1.2 million one. Nobody walks past that kind of gap.
One limitation worth flagging: CHP systems have a 15-megawatt applicable capacity limitation for purposes of the credit, while systems above 50 megawatts generally do not qualify as CHP property under Section 48. Most commercial facilities won’t bump up against these limits, but if you’re running a large industrial operation, double-check your system sizing before you file anything.
Microgrid Controllers Got Added To The Mix
This is the part that flew under the radar for a lot of people. The IRA expanded the Section 48 investment tax credit to include qualified microgrid controller property as eligible energy property.
What qualifies? The controller must be part of a qualified microgrid and designed to monitor and control the energy resources and loads on that microgrid. The qualified microgrid must include equipment capable of generating not less than 4 kilowatts and not more than 20 megawatts of electricity and must be capable of operating both in connection with and independently from the larger electrical grid.
Data centers, hospitals, food-processing plants, and facilities near military installations are the kinds of operations already investing in microgrids because a single hour of grid downtime can cost $500,000 or more. The Section 48 credit doesn’t change whether the microgrid makes sense. It just makes the payback math considerably more attractive.
The Bonus Adders Most People Forget About
Beyond the base-to-30% jump for labor compliance, there’s a stacking structure that catches even experienced tax teams off guard.
Projects located in energy communities—think regions with shuttered coal mines or decommissioned fossil-fuel plants—can tack on an extra 10%. Meet domestic content sourcing thresholds for steel, iron, and manufactured components? Another 10%. Certain qualifying projects located in low-income communities or on Indian land may be eligible for an additional 10 or 20 percentage points through the Low-Income Communities Bonus Credit Program, subject to the program’s allocation and eligibility requirements.
Run the numbers on a CHP installation in a former coal town, built with American-made equipment, meeting all labor requirements. You could be looking at an effective credit rate of 50% or more, depending on which bonus provisions apply and whether the project satisfies their respective requirements. That kind of number transforms a project from “maybe next fiscal year” to “we should have started yesterday.”
Timing Matters More Than You’d Think
Section 48 credits attach to the tax year the property is placed in service. Not when you broke ground. Not when the purchase order went out. For tax purposes, placed in service generally turns on when the property is ready and available for its intended use, with project-specific documentation supporting that date.
CHP commissioning can drag anywhere from six to eighteen months. Microgrid controllers typically move faster, but integration with legacy building management systems has a way of eating up weeks you didn’t plan for. If you’re aiming to claim the credit in a specific tax year, work backward from that deadline.
And here’s the timeline pressure nobody talks about enough.Section 48 generally remains available for qualifying energy property whose construction began before January 1, 2025, subject to the applicable transition and placed-in-service rules. Under current IRS guidance, qualifying Section 48 property whose construction began after 2024 generally cannot claim the Section 48 credit. For qualifying clean-electricity facilities placed in service after 2024, Section 48E provides the successor technology-neutral investment credit, but its eligibility rules differ by technology. Construction-start safe harbors exist, but the documentation requirements are tight and unforgiving.
Conclusion
You’ll file using IRS Form 3468, and a detailed cost-basis or cost-segregation analysis may be necessary to identify and substantiate qualifying property. That shared piping between your CHP system and an unrelated process? It needs careful analysis and allocation, not a rough estimate.
This is genuinely not the place to rely on a generalist CPA. Energy credit filings have quirks that trip up firms without specific experience in this space. Getting it wrong doesn’t just mean leaving money behind. It means potential audit exposure on credits you did claim.
Your facility may already have qualifying assets in the ground. For projects that fall outside the Section 48 transition rules, the availability of a Section 48E credit must be evaluated separately because Section 48E has different eligibility requirements and does not simply carry forward every category of property that qualified under Section 48.
