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CCUS Parasitic Load on Power Plant

CCUS · Net efficiency penalty · DOE NETL baseline

CCUS Parasitic Load on Power Plant
Net plant efficiency penalty for CO₂ capture: reboiler steam extraction (lost turbine output) + CO₂ compression power + auxiliaries. Per DOE NETL Cost & Performance Baseline; IPCC SR-CCS.

Plant

MW
%

Capture System

%
GJ/tCO₂

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CCUS parasitic load on power plants: steam extraction loss, CO₂ compression power, and net efficiency penalty for NGCC and coal retrofits.

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Engineering Basis

  • Steam extraction: 0.20 MWh_e lost per GJ_thermal (LP steam at 4 bara → turbine bypass).
  • CO₂ compression: 0.110 MWh/tCO₂ for 5-stage to 150 bara (DOE NETL).
  • Aux: 0.040 MWh/tCO₂ (pumps + blower + cooling water).
  • Plant CO₂ factors (kg/MWh_thermal): NGCC 198, coal 340.
  • Typical η drops at 90% capture: NGCC 7-9 pp, USC coal 10-12 pp.
  • Standards: DOE NETL Cost & Performance Baseline (2022), IEAGHG, IPCC SR-CCS.

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