Making the Business Case for Commercial Solar
Commercial solar decisions are financial decisions. Here's the framework your team needs.
Key Metrics to Evaluate
- Simple Payback Period: Total cost ÷ annual savings. Most commercial systems pay back in 4–7 years.
- IRR (Internal Rate of Return): Typically 10–20% for well-sited commercial systems — compare to your cost of capital.
- NPV (Net Present Value): The total value of future savings in today's dollars. Should be strongly positive.
Depreciation: The Hidden Accelerator
Commercial solar qualifies for MACRS 5-year accelerated depreciation, plus a 60% bonus depreciation in year one (2026 rate). This dramatically improves after-tax returns and is often the deciding factor for profitable businesses.
Financing Options
- Cash purchase: Best ROI, full ownership of incentives.
- Commercial loan: Preserve capital, still own the system and incentives.
- Power Purchase Agreement (PPA): $0 down, pay per kWh — no ownership, but immediate savings.
- Operating lease: Off-balance-sheet, predictable payments.
Questions to Ask Your Installer
- Can you provide a 25-year pro forma with sensitivity analysis?
- What production guarantee do you offer?
- Who handles O&M (operations and maintenance)?
- What happens if production falls short of projections?