From the page: Think of the LM6000 as a jet engine that's afraid of heights. GE engineers have built upon its aviation roots and modified the technology to function in industrial power generation and marine propulsion.
In simple terms, a gas turbine compresses air, mixes it with fuel, and then burns the mixture to spin a series of massive turbine blades. The spinning turbine then drives a generator to create electricity. In the case of the LM6000 family, the energy generated is capable of achieving over 50 megawatts of output in as little as 10 minutes after startup.
That timing is crucial for utilities that use the LM6000s as a stopgap measure in so-called "peaker plants." During the summer months when pressures on the national grid are high due to cooling needs, peaker plants are placed online for short durations to help baseload power sources (coal, nuclear, geothermal) meet excessive demand quickly.