An ongoing cost for running a product, business, or system

The range of temperature from minimum operating temperature to maximum operating temeperature that a device will operate as designed.

The temperature at which an electrical or mechanical device normally operates

The operating reserve is the generating capacity available to the system operator within a short interval of time to meet demand in case a generator goes down or there is another disruption to the supply.

In an open-loop control system, the control action from the controller is independent of the process variable.

A simple configuration of gas turbine including a compressor, combustion chambers and turbine.

Open-circuit voltage is the difference of electrical potential between two terminals of a device when disconnected from any circuit. There is no external load connected.

The open-circuit test, or no-load test, is one of the methods used in electrical engineering to determine the no-load impedance in the excitation branch of a transformer.

An open system, which both matter and energy can enter or exit, though it may have variously impermeable walls in parts of its boundaries.

The nuclear fuel cycle is referred to as an open fuel cycle if spent fuel is not reprocessed.

Open energy system database projects employ open data methods to collect, clean, and republish energy-related datasets for open use.

The Open Access Same-Time Information System (OASIS), is an Internet-based system for obtaining services related to electric power transmission in North America.

The Organization of the Petroleum Exporting Countries.

Wind Farms that are contructed on land. Onshore wind farms are less expensive to construct than offshore wind farms, they have a bigger visual impact and less wind speed and consistency.

One part per million (ppm) denotes one part per 1,000,000

One part per hundred is generally represented by the percent sign (%) and denotes one part per 100 (102) parts, and a value of 10−2.

A specialized type of HRSG without boiler drums where the inlet feedwater follows a continuous path without segmented sections for economizers, evaporators, and superheaters.

The nuclear fuel cycle is referred to as a once-through fuel cycle if spent fuel is not reprocessed.

The fourth largest copper deposit and the largest known single deposit of uranium in the world.

An oil well is a boring in the Earth that is designed to bring petroleum oil hydrocarbons to the surface.