Portugal’s Solar Record Shows Why Yield Assessment Matters
Portugal’s grid operator confirmed it this month: solar was the country’s number one source of electricity in July, for the first time ever.
https://www.ren.pt/en-gb/media/news/solar-power-was-the-main-source-of-electricity-generation-for-the-first-time-in-portugal
But look past the headline and the same report tells a quieter, more useful story. REN’s own productivity index for July put solar at 0.89 and wind at 0.71 against the long-run baseline of 1.00 — a record month for output, delivered by a resource that still ran below its historical average.
That gap is the entire argument for rigorous resource assessment. A desktop P50 estimate tells you what a site should produce over twenty-five years. It does not tell you what July looked like, or what next July will look like, or how a lender will price that uncertainty into a term sheet.
We run our own measurement campaigns — lidar, met masts, independent energy yield studies — before a project goes anywhere near a data room. Not because the regulations require it, though they increasingly do, but because bankability is built on a number an investment committee can defend, not a number that was hoped for.
Records get headlines. Productivity indices get financings closed.
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