fwiw, I tried to find a source and couldn't... also, R&D funding gets messy since the definition can be blurred by what's considered R&D, if and how much energy

fwiw, I tried to find a source and couldn't... also, R&D funding gets messy since the definition can be blurred by what's considered R&D, if and how much energy or other R&D goes to coal, etc... finally, it's unclear if $500M is a lot or a little - wind/solar get billions in many forms of support...