The pointed references in Energy credit Residential Energy ( Q#1 and Q#4) are little confusing to say the least.
I get it, the evolution of this energy credit and the terminologies that are used for 25C and 25D has made it more convoluted.
Any way coming back to my original question , I read the above links as , 2016 solar electric system installation credit and energy improvements credit for 2021 are separate, the way it is treated towards overall life time energy credit limit of $500.
