{"schemaVersion":"report-figure-v1","report":{"slug":"solar-beam-diffuse","title":"Beam and Diffuse: Two Kinds of Light, and Where a Tracker Pays","url":"https://solaranalytica.com/solar-beam-diffuse","datePublished":"2026-05-07","lastReviewed":"2026-05-07"},"figure":{"id":"diffuse-fraction-gradient","title":"The diffuse-fraction gradient. Share of annual light that arrives scattered","unit":"%","caption":"The deciding variable: diffuse fraction (scattered sky light as a share of total GHI) per market. Below about a quarter the sky is beam-dominated; above about half, most light is scattered. NASA POWER long-term average, from the Solar Analytica irradiance profiles.","series":[{"label":"Calama (Atacama)","value":19},{"label":"Upington","value":20},{"label":"Pilbara","value":21},{"label":"Phoenix","value":23},{"label":"Ouarzazate (NOOR)","value":30},{"label":"Cairo (Benban)","value":32},{"label":"Riyadh","value":39},{"label":"Dubai","value":45},{"label":"Berlin","value":51},{"label":"Jakarta","value":52},{"label":"London","value":53},{"label":"Reykjavik","value":63}]},"csv":"https://solaranalytica.com/reports/solar-beam-diffuse/figures/diffuse-fraction-gradient/data.csv","publicationState":"fixed-edition","boundary":"The figure remains bound to the report edition. A newer upstream release creates a review obligation and never rewrites these rows automatically."}