Validated Last updated: October 20, 2025

ISS solar arrays degrade at approximately 2-3% per year in the LEO environment

solar-arraysdegradationissspace-environment
Original Source

Phase 0 Solar Power Arrays Consensus Document

Validation History

Mission Data
98% confidence Oct 20, 2025

NASA ISS Power Systems telemetry data 2000-2025

ISS solar array power output has declined 2.5% annually on average over 25 years of operation, consistent with predictions

By: NASA Liaison Team Source Actual flight data provides highest confidence validation

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