Every power plant sits in its own climate — and that climate sets how fast outdoor hardware (HRSG, expansion joints, valves, insulation) corrodes, weathers and thermally cycles. We estimate each plant's ISO 9223 atmospheric-corrosivity class and an environmental-severity index from its own coordinates. Indicative, positive context — where protective insulation extends service life most.
Estimated ISO 9223 class per plant (C1 very low → CX extreme). Most of the world's fleet sits C2–C4; a coastal/humid-tropical tail is C5/CX where unprotected outdoor steel degrades fastest.
Installed capacity in high-corrosivity (C5/CX) sites by country. Positive read: these fleets gain the most service-life from protective removable insulation on outdoor hardware. Not a judgement of any operator.
The dominant climate stress per plant, across the fleet — marine salt corrosion, thermal cycling, heat/UV, dust abrasion or humidity.