generate questions: Reciprocating piston type steam engines remained the dominant source of power until the early 20th century, when advances in the design of electric motors and internal combustion engines gradually resulted in the replacement of reciprocating (piston) steam engines in commercial usage, and the ascendancy of steam turbines in power generation. Considering that the great majority of worldwide electric generation is produced by turbine type steam engines, the "steam age" is continuing with energy levels far beyond those of the turn of the 19th century.
What type of engines became popular for power generation after piston steam engines? {sep_token} What type of steam engines produced most power up to the early 20th century? {sep_token} What type of steam engine produces most electricity in the world today? {sep_token} Along with electric motors, what type of engines superseded piston steam engines? {sep_token}