Stationary High-Pressure Steam Engineer is an operating engineer that is licensed though competency by examinations for grades third through chief.  In the USA alone there are 100s of thousands of high pressure boilers alone in manufacturing or district heating, institutions, medical centers, public sector and with the vast majority in the private sector.

Chief Engineer of a stationary high-pressure steam plant has a leadership position and needs to command the steam plant operation economically and safety.

A 3rd Class Engineer in a stationary high-pressure steam engineer is a watch engineer.  This is also an entry level into Stationary High-Pressure Steam Engineering licensing too.  To be a candidate for a  3rd class is possible by going through an accredited learning program at a School or College or transition from LP Boiler Operator's license.  A more traditional path to 3rd Class stationary high-pressure engineers license is by experience.

Gas Turbine Operating Engineers are in demand for gas fired peaking power plants.  Gas turbines or combustion turbines as they are also called as well as simple cycle.

These gas turbines can be brought on-line producing 100s of MW in minutes when a wind-farm looses its wind or a cloud shades a photovoltic region.  So, this is especially important with more and more usage of photovoltic and wind power generators that cannot power a manufacturing base of a country or a large population since they are dependent on weather and more importantly solar activities.  Therefore, being a gas turbine 3rd Class, 2nd Class or 1st Class Gas Turbine Engineer is important to off-set the loss of base load fossil fuel power stations to meet the demand of the electric power grids.

Gas turbines come is three difference or basic catagories:  Large frame combustion turbines, large aero-derivative gas turbines, and micro-turbines.  Areo-derivative gas turbines are uses as a rule for peaking power stations.