Just as in a coal-fired power plant, the steam then drives turbines. Rapid jets of steam pass through the turbine's fans and spin them around. The spinning of the turbines, in turn, drives magnets around and around. This generates electricity. There are many other ways to generate electricity.
Water falling over dams can drive turbines, a process known as hydro-power.
Or sunshine can generate electricity through photovoltaic solar panels. Or windmills can do the job. So can fuel cells, which use chemical reactions. Each method has different costs, and each method has different environmental consequences. I read that the ozone layer can rebuild itself.