Underwriting a solar or wind project is not a view on the energy transition. It is a view on whether a specific asset will produce a contracted amount of electricity, sell it to someone who pays, and survive construction without eating the equity.

Separate volume from price

Volume comes from the resource study and the plant design: irradiance or wind speed, losses, availability, and degradation. Price comes from the offtake. Mixing them into a single revenue cell hides which assumption you are actually betting on. If the resource case is aggressive and the contract is short, you are underwriting merchant exposure, not a bond.

Construction is where models go quiet

Ask who carries cost overrun, who carries delay, and what happens if a key component slips. A fixed-price EPC contract is only as good as the contractor balance sheet and the liquidated damages behind it. Contingency that sits inside the sponsor equity is not contingency. It is a lower return.

The counterparty is the asset

A twenty-year contract with a weak buyer is a credit underwriting, not a power underwriting. Read the termination clauses, the curtailment rules, and whether the price resets. Then ask a simpler question: if production comes in five percent light, does the capital structure still service debt without a cash call?

If the answer depends on a perfect year, the project is not underwritten. It is hoped for.