I don't know what you mean by 'energy'. Comparing Mars and Venus, Venus has thousands more times energy in its atmos than Mars. Any colony, which would probably have to be subsurface on Venus, would have limitless engergy from the atmos, whereas Mars has got a many times weaker atmosphere than Earth. Mars' 'storms' would be summer zephyrs on Earth. AFAIK Venus doesn't have an active core; it isn't producing convection which would produce vulcanism, so it's either very hot and keeping the surface very hot or it's much cooler than it should be.