Certainly I don't expect there to be one source that covers everything, but I've had a hard time finding any sources which felt like they covered things in sufficient depth/detail
Greentech Media used to be really good but they got bought out by some market intel firm and now everything is hidden behind a consultancy. Sad.
I mostly just have a bunch of a keywords on Google News, and look up papers on Scholar if they're mentioned.
Would also be interested in more "push" based sources like newsletters if there are any out there.
(Worked in solar on and off for a decade+, but mostly doing web dev. Don't keep up with the research much.)