Fuel cells have a very high buzz factor these days.
I’m not sure of this since I don’t have the context, but ‘buzz factor’ usually means how much people are talking about something. Lots of people talking creates a buzz and this is considered a big positive for product sales. A high buzz factor could mean that people are likely to spread the word about any new fuel cells that hit the market.
Thanks! The meaning you explained could fit in this context.