# Rated Power > Rated Power means the maximum constant power output of an engine or system, as specified in its technical documentation **Term:** Rated Power **Last updated:** 2026-07-29 ## Definition ## What Rated Power Means in a Contract Rated Power refers to the maximum constant power output that an engine, generator, turbine, or other mechanical or electrical system is designed to deliver under specified operating conditions, as documented in its technical specifications or manufacturer's data sheet. Within a contract, this term is not a vague technical descriptor but a defined performance standard against which delivery, acceptance, and ongoing operation can be measured. Parties rely on Rated Power to establish objective benchmarks. Whether the agreement concerns the supply of industrial machinery, the installation of a power generation asset, or a service contract tied to equipment throughput, Rated Power creates a fixed reference point that both sides can verify. This reduces ambiguity about what has actually been promised and what will be tested or inspected. ## How Rated Power Is Defined or Measured Rated Power is typically expressed in units such as kilowatts (kW), megawatts (MW), or horsepower (HP), and is derived from standardized testing performed by the manufacturer or an accredited testing body. The figure usually reflects performance under specific reference conditions, including ambient temperature, altitude, humidity, and fuel or energy input quality, all of which can affect actual output in the field. Contracts that reference Rated Power should ideally specify the testing standard or methodology used to establish the figure, since different standards can produce different results for the same physical unit. Common approaches include continuous rating, prime rating, and standby rating, each reflecting a different duty cycle or expected usage pattern. - Continuous rating: power output sustainable indefinitely without damage - Prime rating: power output sustainable for variable loads over extended periods - Standby rating: maximum power available for short-duration backup use ## Where Rated Power Appears in Agreements Rated Power commonly appears in equipment supply agreements, energy sector contracts, manufacturing specifications, and lease or hire agreements for generators, engines, or industrial plant. It is frequently a core term in a