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Note: Tariff rates are adjusted annually based on the UK Retail Price Index (RPI). Your installation qualified for the highest FIT rate available in 2012, locked in for 25 years.
Clear-sky days only — seasonal variation removed — linear regression of peak output vs year
Method: Real inverter readings only (synthetic gap-fill excluded). Clear-sky days: peak/mean ratio 1.35–1.85 with ≥1.5 kWh daily generation. Regression: peak = β0 + β1 year + seasonal harmonics removes day-of-year variation. Dots show per-year median de-seasoned peak.