Commercial solar arrays can cut a building’s electricity bill dramatically, but the upfront cost stops many owners cold. A rooftop system for a mid sized warehouse often costs between 100,000 and 500,000 dollars installed. For many businesses, that kind of capital outlay is not realistic, even with tax credits on the table.
Leasing the panels, or signing a power purchase agreement, lets a business use solar power with little or no money down. The two arrangements look similar from the roof but work very differently in the contract. This guide explains both, covers the tax and cost questions, and flags the terms that matter most.
The Two Main Ways to Go Solar Without Buying
An equipment lease works like other equipment leases. A solar company owns the panels, installs them on your roof or land, and you pay a fixed monthly lease payment for 15 to 25 years. You use the electricity the panels produce, and the panels stay on your property. At the end of the term, you can usually extend the lease, have the system removed, or buy it outright.
A power purchase agreement, or PPA, is different. You do not lease the panels at all. You agree to buy the electricity they generate at a set price per kilowatt hour for 15 to 25 years. The developer owns, operates, and maintains the system, and you simply pay for the power. PPAs are extremely common for commercial projects because the developer can claim the tax credits that your business might not be able to use.
Which option is better depends on your tax position and your goals. If your business has enough tax liability to use federal incentives, leasing the equipment directly can capture more value. If not, a PPA lets the developer monetize the credits and pass some of the savings to you in a lower power price.
Tax Credits and Incentives
The federal investment tax credit allows eligible commercial solar projects to claim a percentage of the system cost as a tax credit. The details change with legislation, so confirm the current percentage with a tax professional before modeling your savings. In a lease, the leasing company usually claims the credit and builds it into your payment. In a PPA, the developer claims it and reflects it in the power price.
States and utilities add their own layers. Net metering rules determine how much credit you get for surplus power sent to the grid. Some utilities pay generously, others credit at wholesale rates. Local property tax treatment of solar equipment also varies, so check whether the added equipment changes your property tax bill.
Depreciation matters too. The company that owns the system can depreciate it, which is another reason ownership often sits with the developer or lessor rather than the building owner. Ask your accountant to run the numbers both ways before you commit.
Typical Costs and Savings
With a lease, expect monthly payments scaled to system size. A 100 kilowatt commercial array might lease for 1,500 to 3,000 dollars per month depending on location, incentives, and term length. With a PPA, commercial power prices often start 10 to 30 percent below the local utility rate, with a fixed annual escalator of 2 to 3 percent.
Savings depend on your current electricity rate, how much of your usage the system covers, and the escalator in your contract. A building in a high rate utility territory saves more than one where power is cheap. Run a 25 year projection using your actual bills, not the vendor’s optimistic assumptions, and compare the escalator against historical utility rate increases.
Roof condition affects the math. If your roof needs replacement within the system life, the panels must come off and go back on, which costs money. Most developers require a roof with at least 15 to 20 years of life remaining. Get a roofing inspection before signing anything.
Site Requirements and the Assessment Process
Not every roof qualifies. The roof needs enough unshaded area, structural capacity for the added weight, and an electrical system that can accept the interconnection. The developer performs a site assessment, reviews 12 months of your utility bills, and designs a system sized to your usage and roof space.
Ground mounted systems are an option when the roof is unsuitable, and they bring their own lease questions. Property owners who lease land for energy projects should study how solar farm ground leases work for landowners, since the payment structures and long terms overlap with what a rooftop developer will propose.
Permitting and interconnection take time. Utility approval, building permits, and inspection schedules add months to the timeline. A realistic schedule from signed contract to permission to operate is often 3 to 9 months for a commercial rooftop project.
Contract Terms That Matter Most
Term length is the big one. Fifteen to 25 years is standard, and the contract should spell out exactly what happens at the end. Removal of the panels, roof restoration, and who pays for it all need to be in writing. Do not assume the developer will simply take the system away for free.
Escalator clauses deserve close attention in PPAs. A 2.9 percent annual escalator compounds, and over 25 years the power price roughly doubles. Compare the escalated price in year 20 against a conservative estimate of future utility rates. Some contracts offer a fixed rate with no escalator, usually at a slightly higher starting price.
Maintenance and performance guarantees belong in the contract. The owner of the system should handle monitoring, repairs, and inverter replacements. A production guarantee, promising a minimum annual output, gives you recourse if the system underperforms. Without it, you carry the risk of a lazy system.
Environmental and Roof Considerations
Solar panels change how a property handles stormwater, roof access, and fire code compliance. Confirm that the installation meets local fire setback rules and that your building insurance still covers the roof as modified. Projects on industrial sites should also review environmental liability issues in commercial leases, since long term equipment installations can interact with contamination or remediation obligations.
Insurance Requirements
The developer or lessor will require you to carry certain insurance on the building, and they will insure the system itself. Review standard insurance requirements in commercial leases to make sure your existing policies satisfy the contract without expensive add ons. Confirm who pays the deductible if a storm damages the panels.
Questions to Ask Developers
Ask for the buyout schedule if it is a lease, meaning the price to purchase the system in each year of the term. Ask for the PPA price schedule for every year, not just year one. Ask what happens if you sell the building, because the buyer must accept the contract, and an unattractive contract can complicate a sale.
Ask about the removal and restoration bond. Reputable developers post financial assurance that the system will be removed at end of term. Without it, you could inherit removal costs if the developer goes out of business. Ask for proof, not promises.
Ask for references from commercial customers with systems at least five years old. New systems all look good on paper. Five year old systems reveal the truth about maintenance response and actual production versus projections.
Common Pitfalls
The classic mistake is signing based on the vendor’s savings estimate without checking the assumptions. Confirm the utility rate used, the assumed annual usage, and the degradation rate of the panels. A small change in any of them shifts 25 year savings by tens of thousands of dollars.
Another pitfall is the roof warranty gap. Some roofing manufacturers void their warranty if panels are installed without their approval. Get written confirmation from your roofer or the membrane manufacturer before the first bolt goes in.
Finally, do not confuse a lease with a PPA when comparing quotes. They are different products with different risks and benefits. Compare leases to leases and PPAs to PPAs, and run both against simply buying the system if you have the capital and the tax appetite.
Getting Started
Pull 12 months of electricity bills and get a roof inspection first. Then solicit proposals from at least three experienced commercial developers. Ask each one to quote both a lease and a PPA if they offer both, so you can see the difference on your own building.
Have an attorney review the final contract, and have your accountant model the tax effects. Solar is a 25 year commitment on your building, and an hour of professional review is a small price for certainty. Done right, leased solar locks in lower power costs without touching your capital budget.
