How do you underwrite a solar project?
Solar underwriting covers technical, commercial, and financial diligence—resource, interconnection, offtake, capex, and tax-credit eligibility—before capital is committed.
Every commitment Sunlight Energy Investments makes rests on rigorous solar project underwriting. Before capital is deployed, we stress-test the technical, commercial, and financial assumptions that determine whether a project will perform over a multi-decade operating life—a discipline that protects both investors and developer partners.
What does technical solar diligence cover?
Technical diligence tests whether the plant can be built and operated as modeled. Before capital is committed, we independently review:
- Resource and yield: irradiance data and production modeling against P50/P90 expectations
- Design and equipment: module, inverter, and tracker selection and warranties
- Site conditions: geotechnical, environmental, and constructability factors
- Interconnection: queue position, studies, and upgrade costs
Interconnection risk is often the largest schedule variable in late-stage development—and we model it conservatively before committing.
What does commercial solar diligence cover?
Commercial diligence tests whether contracted revenue will hold. The revenue side gets equal scrutiny:
- Offtake: PPA tenor, pricing, and the creditworthiness of the counterparty
- Permitting: the status and risk of local, state, and federal approvals
- Contracts: EPC, O&M, lease, and interconnection agreements
We evaluate whether offtake terms meet the bar for a bankable PPA that lenders and tax-equity partners will finance.
What does financial solar diligence cover?
Financial diligence tests whether the capital stack still works when the main assumptions move. We build a bankable model that captures:
- Capital and operating costs across the asset life
- The full capital stack: equity, tax equity, and debt
- Federal credit eligibility—beginning-of-construction documentation and placed-in-service timing under the One Big Beautiful Bill Act and the post-OBBBA phase-out rules
- Sensitivity and scenario analysis on the key value drivers
Why do underwriters pass on marginal solar projects?
Not every project clears the bar, and that is the point. Disciplined underwriting protects investors and developer partners alike. We would rather pass on a marginal project than compromise on diligence.
Working with Sunlight
Our in-house diligence capabilities let us move decisively while maintaining institutional rigor. Developers seeking a decisive, experienced equity partner can explore our developer program or reach our team to start a conversation.
