I believe the boron fusion reactor, if feasible of course, would change society in a lot of ways as yet unpredictable. A few guesses, though.

Electric power interties would become less essential, line losses less of a factor, supply able to meet demand more easily in all conditions, resulting in far less expensive power. That might encourage research into ways to supply power to moving vehicles.

I would expect electricity powered trains, and possibly trucks required to ride trains inter-city. That would relieve congestion on freeways. And cut into the fuel taxes used to maintain freeways, but provide funds for railway roadbed maintenance.

Electric tractors might be used to move trucks around cities once the trains got them there. Fossil fuels might be needed to move them to suburbs and farther. The weight of batteries needed to supply auxillary power for short hauls may not be critical for a truck, and they could be engineered to accept packs which could drive wheels and be removed for charging. A clamp on a drive-line, for instance, after it was disengaged from the transmission.

Electricity would become available to remote areas, poor areas, and certainly improve the chances for economic development. Right now in Africa some folks who are comparatively well-off have car batteries for light, take them to the store for recharging.

As far as getting rid of radioactive by-products from the sources that have them, that's easy once one gets past the irrational fears of some people. I don't have a lot of patience for the folks who say that geologically stable regions aren't stable enough. Cast 'em in glass, bury them in dry rock or salt which ain't going anywhere, and probably dig them up later for isotopes. Seems to me the protestors are using electricity, contributing to the demand, much as many of the irrational tree-huggers live in wooden houses.

Arf