The 7-Point Solar Procurement Checklist for Commercial Property Managers

Who This Is For (and When to Use It)

You're a facility manager or corporate energy buyer, and you've been asked to look into solar. Maybe your CFO heard about the tax credits. Maybe your tenants are pushing for sustainability goals. Or maybe your electric bills just jumped 18% like ours did in Q2 2024.

This checklist is for the moment after you've decided solar might make sense. Not the sales pitch stage — the procurement stage. You're comparing vendors, trying to figure out which proposal is actually better, and wondering where the landmines are.

I've managed our energy contracts for 6 years, tracked about $180,000 in cumulative spending, and negotiated with 8+ vendors. This 7-step checklist is what I wish I'd had from day one.

Step 1: Map Your Load Profile (Not Just Your Roof Space)

Most buyers start with roof measurements. That's backwards. Start with your utility data.

Pull 24 months of interval data — hourly if you can get it, daily at minimum. You're looking for three things:

• Peak demand months — is it AC-driven summer loads, or winter heating?
• Time-of-use patterns — do you run heavy equipment at night, or is your load mostly 9-to-5?
• Utility rate structure — are you on a demand charge tariff? Time-of-use rates? Flat commercial rate?

Why this matters: a vendor can design a system that offsets 100% of your annual consumption but misses your peak demand window, leaving you with the same high bills nine months of the year. I learned this the hard way when our first quote looked great on paper but barely touched our July afternoon peaks.

Checkpoint for this step: You should be able to tell any vendor your average monthly kWh, your peak demand month, and your utility rate structure. If you can't, stop here and call your utility.

Step 2: Compare Financing Structures, Not Just System Prices

This is where most procurement people get tripped up. You see two proposals:

• Vendor A: $1.8 million, equipment ownership
• Vendor B: $0 upfront, Power Purchase Agreement (PPA) at $0.09/kWh

The instinct is to compare those two numbers and conclude one is clearly better. But they're fundamentally different products.

The three common structures in commercial solar:

• Cash purchase — highest upfront cost, you own everything, capture full tax benefits. Payback period is typically 4-7 years for commercial.
• Solar loan — lower upfront, you still own the system, but you're paying interest. Useful if you have the tax appetite but not the cash.
• PPA / Lease — no upfront, no ownership, no tax benefits. The vendor owns the system and sells you the power. Monthly payments are predictable but you don't capture the long-term upside.

The question I now ask every vendor: "What's the 10-year total cost of ownership under each structure? Include escalation clauses, maintenance, and what happens if I sell the building." Most vendors have a spreadsheet ready. If they don't, that's a red flag.

Checkpoint: You should have at least two financing options to compare, with 10-year TCO projections for each. A single option is not enough data.

Step 3: Verify Component Warranties (the Fine Print Matters)

Panel warranties are usually straightforward: 25-30 year performance guarantee, 10-12 year product warranty. But I've seen proposals where the "25-year warranty" covers only 80% of rated output, not 90%. That's a meaningful difference — a system that degrades faster costs you more in the long run.

The bigger trap is inverter and battery warranties. Inverters typically last 10-15 years. Batteries? Depends on chemistry and cycles.

I always ask for the specific warranty document, not just a summary. Look for three things the sales team might not mention:

• Labor coverage — does the warranty include labor for replacement, or just the part?
• Throughput limits — battery warranties often cap total energy throughput, not just years. If you cycle the battery daily, you might hit the cap before the term expires.
• Defined degradation curve — is the degradation linear or front-loaded? Some batteries lose capacity faster in the first 3 years, then stabilize.

Checkpoint: You should have PDF copies of the actual warranty documents, not marketing summaries, for every major component.

Step 4: Ask About Interconnection (the 6-Week Delay You Didn't Plan For)

Utility interconnection is the #1 cause of project delays in commercial solar. The system might be ready to flip on, but the utility takes 6-12 weeks to approve the interconnection application, install the meter, and do the final inspection.

I ask each vendor two questions:

• "What's your average interconnection timeline for our utility district?"
• "Have you done projects with this specific utility before?"

A vendor with strong relationships and a track record will have a smoother process. A vendor who has never worked with your utility will likely underestimate the timeline — and your project will sit idle while they figure it out.

Checkpoint: Vendor should provide 3-5 reference projects within your utility district, with actual (not projected) interconnection dates.

Step 5: Build a Battery Storage Discussion (Even If You're Not Sure Yet)

Not every commercial site needs batteries today. But the economics are shifting fast, and adding battery capacity later is harder — and more expensive — than designing for it now.

The two scenarios where battery storage makes sense in 2025:

• Demand charge mitigation — if your peak demand charges are 40%+ of your bill, a battery can shave the peaks and save serious money.
• Backup power — if you have critical loads (refrigeration, servers, medical equipment), a battery keeps you running through outages without a generator.

I ask vendors to quote two versions: solar-only, and solar + battery with enough capacity to cover my critical loads for 4 hours. The incremental cost usually surprises me — sometimes it's less than expected because of the federal ITC stacking with state incentives.

And honestly, asking about batteries signals to the vendor that you're sophisticated. They're less likely to try to oversimplify things.

Checkpoint: Get a separate line-item cost for battery integration, even if you don't buy it now. Future-proofing is cheaper than retrofitting.

Step 6: Check Vendor Financial Health (Will They Be Around in 10 Years?)

This one feels awkward, but it matters. You're signing a 20-25 year agreement. If your vendor goes bankrupt in year 4, who services the system? Who honors the warranty?

I look for two things:

• Financial reports — if the vendor is public, check their latest 10-Q or 10-K. Look for revenue trends, debt levels, and any going-concern language. For Vivint Solar specifically (now part of Sunrun), their parent company's financials are public.
• Service history — ask for the number of years they've been operating in your state. A vendor with 3 years of local experience might not have the infrastructure to support you long-term.

I found a vendor once whose pricing was 20% lower than everyone else. When I checked their financials, they had negative operating cash flow and were burning through their last funding round. Hard pass.

Checkpoint: Document the vendor's legal name, parent company (if any), years in business locally, and a recent financial indicator (revenue trend or credit rating).

Step 7: Create a Commissioning Checklist (Don't Just Flip the Switch)

This is the step most procurement teams skip. The system is installed, the utility gives approval, and everyone assumes it works. But I've seen systems that were misconfigured — inverters set to the wrong voltage, batteries not charging during off-peak hours, monitoring dashboards showing fake data.

Before you sign off on final payment:

• Verify each inverter is communicating — log into the monitoring platform and confirm every inverter is reporting real-time data.
• Test the battery under load — don't just trust the simulation. Discharge the battery to a known level, verify it powers your critical loads, and confirm recharge behavior.
• Compare day-1 production to the proposal — if the system is generating 10% less than modeled, something is wrong. It could be shading you didn't anticipate, a panel orientation issue, or a configuration problem.

I learned this one the hard way (ugh). Our first system looked perfect on the dashboard for three months. Then we had an outage, and the battery didn't switch over. Turns out the transfer switch was wired incorrectly. We caught it because I insisted on a commissioning test — but only because I'd been burned before.

Checkpoint: You should run at least 7 days of post-commissioning data before releasing final payment. No exceptions.

Common Mistakes to Watch For

Mistake 1: Comparing systems based on size (kW) instead of production (kWh). A 100 kW system in Arizona produces more than a 100 kW system in Seattle. Always compare estimated annual production, not just panel count or system size.

Mistake 2: Assuming all financing includes maintenance. Some PPAs include monitoring and maintenance; others don't. Read the operations and maintenance (O&M) section carefully. Cleaning, inverter replacement, and battery servicing can add $0.005-$0.02/kWh to your cost.

Mistake 3: Skipping the escalation clause review. PPA contracts often have annual escalators — 2-3% per year. Over 20 years, that turns a $0.09/kWh PPA into $0.13+/kWh. Ask if the escalator is fixed or tied to inflation (CPI). A fixed escalator protects you if inflation runs hot.

Mistake 4: Forgetting about property tax implications. In some jurisdictions, solar installations increase your property tax assessment. In others, they're exempt. Check with your local assessor before signing.

This checklist was accurate as of Q1 2025. Solar technology, financing structures, and utility policies change fast. Verify current rates, incentives, and equipment specs before committing to a vendor.