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Pareto — Wind Farm Unplanned Downtime

Lost generation hours by failure mode across a 42-turbine wind farm, computing that 4 of 12 modes account for 80.7% of 8,310 downtime hours and that gearbox bearings alone carry 38% of the fleet's outage time.

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Wind farm unplanned downtime by failure mode — 2027 YTD2027 YTD · 12 categories · total 8,310 downtime hours · threshold 80%2027 YTD (downtime hours)Cumulative %01,0002,0003,0004,0000%20%40%60%80%100%80% threshold3,1801,82096574248637124417832438.3%60.2%71.8%80.7%86.6%91.0%94.0%96.1%100%vital few · 4Gearbox bearingPitch system faultGenerator windingConverter IGBTYaw driveBlade leading-edge damageMain bearingTransformer tripOther4 of 12 categories (33%) account for 80.7% of 8,310 downtime hours.Vital few at 80%: Gearbox bearing, Pitch system fault, Generator winding, Converter IGBT — 6,707 of 8,310downtime hours.Other folds 4 categories under 1.5% of total (324 downtime hours, 3.9%).42 × 3.6 MW turbines; lost generation valued at about £1.9 M

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title "Wind farm unplanned downtime by failure mode — 2027 YTD"
unit downtime hours
period "2027 YTD"
threshold 80%
other-below 1.5%
note "42 × 3.6 MW turbines; lost generation valued at about £1.9 M"

"Gearbox bearing"              3180
"Pitch system fault"           1820
"Generator winding"             965
"Converter IGBT"                742
"Yaw drive"                     486
"Blade leading-edge damage"     371
"Main bearing"                  244
"Transformer trip"              178
"Anemometer / sensor"           121
"Hydraulic leak"                 94
"Grid protection trip"           67
"Lightning strike"               42