Why Power Plant Capacity Rated in MW not in MVA?

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Why Power Plant Capacity Rated in MW not in MVA?

  • Power sources always rated at MVA or kVA (like generator, or any source of electricity). Transmission and distribution got maximum voltage and current levels to carry (no kW or kVA). Loads always rated at kW and charged by electricity companies in kW.
  • Sometimes, it’s written that this generator can produce kW @ pf=0.81, that’s rediculous no need for that in my opinion. only marketing engineers trying to low level technical language for business intentions.
  • By the way, the saying that ” Reactive power is the share of the apparent power which represents a useless oscillation of energy from the source to the user and back again.” is wrong.
  • It’s stored there inside energy storage elements, inductors and capacitors, otherwise if it was back the electricity company would use it again and never charge you for it.
  • In a Generating station, the prime mover (Turbine) generates only and only Active Power. That’s why we rated a power plant capacity in MW instead of MVA.
  • Its mean no matter how large your generator is, but it depends on the capacity of the  engine (Prime mover/Turbine) I.e. a 50MW turbine connected to a 90MVA alternator in a power plant will generate only 50MW at full load.
  • In short, a power plant rating is specified in terms of prime mover /Turbine (Turbine rating may be seen by nameplate rating which is in MW or Horsepower (HP) not in MVA) and not by the alternator set coupled to it.

Why Power Plant Capacity Rated in MW not in MVA?

  • Another thing is that, electric power company charges their consumer for kVA while they generate kW (or MW) at the power station (Power plant).
  • They penalize their consumer for low Power factor because they are not responsible for low power factor and kVA but you. Moreover, in power plant, power factor is 1 therefore MW is equal to MVA (MW = MVA x P.f).
  • Another interesting & funny answer by one of our Facebook page fan…“Power House means, house of the Power, and we know that the unit or power is Watt.
  • That’s why Power Plant Capacity Rated in MW and not in MVA.

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