The 9-Point Solar NOI Underwriting Checklist for Acquisitions

Why a checklist beats a spreadsheet

Solar revenue is not a modeling problem — it's a diligence problem. The model is simple arithmetic. The risk lives in nine physical and regulatory facts about the asset.

The nine points

1. Roof age and remaining life. If the membrane will not outlast the array, fold a re-roof plan into the timeline. A panel array is a decades-long decision on a surface that may not last that long.
2. Structural headroom. Most post-1990 wood-frame roofs carry a modern array without reinforcement. Older flat-roof buildings need a stamped letter before anyone signs.
3. Utility and tariff. The same array earns wildly different revenue under different tariffs. Identify the utility, the rate schedule, and whether the state allows virtual net metering.
4. Meter layout. Master-metered, individually metered, or a hybrid — this drives whether residents can be billed directly or whether the value shows up as a common-area offset.
5. Interconnection queue. Review times differ widely between utilities and system sizes. It is often the single biggest timing variable, so check the utility's current queue early.
6. Load profile. Daytime common-area load (elevators, pumps, corridor lighting, laundry, EV chargers) is the highest-value consumption because it never touches an export tariff.
7. Shading and usable area. Tree canopy, parapets, setbacks and mechanical equipment can remove a large share of a roof's usable footprint. Satellite estimates flatter reality, so confirm on site.
8. Lease language. Check whether existing leases allow utility rebilling, and whether the state requires specific disclosure language.
9. Exit treatment. Confirm the revenue is assignable to a buyer. Non-assignable revenue does not capitalize, and uncapitalized revenue does not build value.

How to use it

Run all nine before you model. If items 3, 5, or 9 fail, the deal doesn't get a solar line. If only 1 or 7 flag, you adjust size and timing rather than walking away.

What good looks like

A clean asset: post-2000 construction, individually metered, a state with active VNEM, a utility clearing interconnection inside 60 days, and lease language that already permits rebilling. On that profile, revenue is live within a quarter of closing.

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