Helia Solar goes bankable

The challenge

Every financing round for Helia’s next plant began with the same request: an independent performance audit of the plants already running. Each audit took months, cost a six-figure sum and produced a report that was out of date the day it was signed.

The underlying data existed, but it lived in inverter logs and monthly exports that nobody outside Helia could verify.

What we did

Zephyra instrumented all eleven plants at the inverter, reading every string at 15-minute resolution alongside plane-of-array irradiance and module temperature. Readings were reconciled against each plant’s performance model in the same interval and committed, signed, to the ledger.

Helia’s lenders were given read-only access to the same record — performance ratio, availability and curtailment history for every plant, updating every quarter of an hour.

The outcome

The next financing closed without a third-party audit. Lenders took the ledger as the performance evidence, and the covenant reporting that used to take a quarter now takes a link. Two plants also surfaced string-level under-performance that the monthly exports had smoothed away, worth roughly 1.1% of annual output.