2021 Atlantic Tropical Storm/Hurricane season
While it's true that there has only been 1 major hurricane (Cat 3 or above) this year it has been an active season with 19 named storms and 10 hurricanes. As far as energy transfer I think several smaller storms can make up for one larger one.
ACE is an interesting number but I'd be careful about saying how meaningful it is. It is measured by taking the sum of the squares of maximum sustained wind velocity at 6 hour intervals. Where it falls short is it fails to take into account the size of the cyclone and thus ignores the total mass of air being moved by the storm. So it doesn't really measure the total energy in the whole cyclone, just the energy where it's winds are the highest.
