a) training is where the bulk of an AI system's energy usage goes (based on a report released by Mistral)
b) video generation is very likely a few orders of magnitude more expensive than text generation.
That said, I still believe that data centres in general - including AI ones - don't consume a significant amount of energy compared with everything else we do, especially heating and cooling and transport.
Pre-LLM data centres consume about 1% of the world's electricity. AI data centres may bump that up to 2%