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global horizontal irradiance

Map from Solargis showing irradiance data.

Chinese solar irradiance up to 20% higher in 2025 than historical averages

January 12, 2026
Parts of China saw Global Horizontal Irradiation (GHI) reach 20% more than the long-term average (LTA) figures in 2025.
A Tata Power project in India.

Solargis: poorest air quality “in decades” undermines India’s solar power generation

April 22, 2024
Solargis' latest figures for solar irradiance in India show that increased pollution has contributed to falling solar power output.
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