[philipkglass]

On further reflection, whatever issues cause dreadful under-performance of Indian nuclear reactors might also affect solar plants. Solar needs significantly less maintenance than other kinds of generating capacity but if it gets no maintenance then the output will fall even in areas with excellent solar resources. For the US the Energy Information Administration publishes detailed information about all utility-scale generators so it's easy to track performance over time but I don't know where or if equivalent data is available for India.

[option_greek]

The reason for under performance of nuclear is lack of fuel (due to sanctions imposed long back). Its only recently that India is signing up with many nuclear producers so this should improve drastically.