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Solar Irradiance in India
India is endowed with rich solar energy resource since it is located in the equatorial sun belt of the earth. Theoretically India’s solar power reception is about 5000 trillion kWh/year with about 300 clear sunny days in a year. The daily average solar energy incident over India varies from 4 to 7 kWh/m2 with about 2,300–3,200 sunshine hours per year, depending upon location. This is far more than current total energy consumption.

The daily average global radiation is around 5 Kwh/m2 in north - eastern and hilly areas to about 7 Kwh/m2 in Western regions and cold desert areas.

sThe annual global radiation varies from 1600 to 2200 kWh/m2, which is comparable with radiation received in the tropical and sub-tropical regions. Although the highest annual global radiation is received in Rajasthan, northern Gujarat, Tamilnadu and parts of Ladakh region, the parts of Andhra Pradesh, Maharashtra, Madhya Pradesh, Karnataka also receive fairly large amount of radiation as compared to many parts of the world especially Japan, Europe and the US where development and deployment of solar technologies is maximum. Thus it is clear that solar power projects are commercially viable in most parts of India.