I am looking for solar irradiation data for India in a gis format. Like the ones on the link below: http://www.arcgis.com/apps/OnePane/basicviewer/index.html?appid=bf886ca471a54e2c9127a54f60d4ca27
Second top hit for "solar irradiation data in India" gives this: http://mnre.gov.in/sec/solar-assmnt.htm
There's an online map, data files and also contacts you could talk to. They appear to have been part funded by the U.S. National Renewable Energy Laboratory - who I think are the originators of the ArcGIS link you posted.
Solar irradiation data can be found and downloaded here: http://www.nrel.gov/international/ra_india.html
Global Solar Atlas offers raster data as long-term yearly averages (for India calculated for a period 1999-2015) for six parameters (including global horizontal irradiation - GHI, photovoltaic power potential PVOUT, etc.). Data is available as GeoTIFF or ESRI ASCII Grid, 30 arcsec (~1 km) resolution, LatLon WGS84 coordinate system.
Terms is CC BY 3.0 IGO (so kind of free data), copyrighted by The World Bank and provided by Solargis.
Data for other countries or global data layers are available to download, too.