A list of Indian states ranked from highest to lowest average solar irradiance is difficult to pinpoint exactly due to variations within states and reliance on varying data sources

 A list of Indian states ranked from highest to lowest average solar irradiance is difficult to pinpoint exactly due to variations within states and reliance on varying data sources. However, states like Rajasthan, Gujarat, Madhya Pradesh, Karnataka, and Punjab are generally known to have higher solar irradiance. States like those in the Himalayan region (Himachal Pradesh, Uttarakhand, Jammu and Kashmir) and Northeast India (Assam, Arunachal Pradesh) tend to have lower irradiance. Other states like Andhra Pradesh, Tamil Nadu, Maharashtra, and Uttar Pradesh fall into the moderate range. 

Here's a general ranking from high to low, based on available information:

States with High Solar Irradiance:

Rajasthan, Gujarat, Madhya Pradesh, Karnataka, and Punjab. 

States with Moderate Solar Irradiance:

Andhra Pradesh, Tamil Nadu, Maharashtra, Uttar Pradesh, Bihar, Haryana, Odisha, Telangana, Kerala, Chhattisgarh, Jharkhand, and Delhi. 

States with Lower Solar Irradiance:

Himachal Pradesh, Uttarakhand, Jammu and Kashmir, Assam, Meghalaya, Arunachal Pradesh, West Bengal, Goa, and Manipur. 

Factors Affecting Irradiance:

Latitude: Lower latitudes generally receive more direct sunlight.

Cloud Cover: More cloud cover reduces irradiance.

Altitude: Higher altitudes can experience more irradiance due to thinner atmosphere.

Season: Irradiance varies throughout the year, with higher values during summer months.

Topography: Land features like mountains can affect sunlight. 

Note: This is a general ranking, and specific locations within each state can have significant variations in solar irradiance. For example, coastal areas might have higher irradiance than inland areas during certain times of the year due to temperature and cloud patterns.