Nuclear fusion, perpetually 40-years away from practicality , is being researched at UCSD, Berkeley, and MIT with a $7 million dollar Dept of Energy grant. That seems meager, considering the stakes.
A video tour (8 minutes) inside MIT's nuclear fusion program explains that they can get their state-of-the-art machine to run for 2 seconds. During that time they have to pour into it much more energy than they get out, running a powerful magnet and a similarly powerful radio antenna. In fact, for that two seconds the amount of electricity that is put into the machine equals the electric consumption of the entire city of Boston.