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What can I choose in the calculator?

The calculator lets you choose the share of CCGT energy in the total electricity production capacity in Switzerland in the selected year (2035 or 2050).

Combined cycle Gas Turbine (CCGT)

image Hamm-Uentrop power plant, Tim Reckmann, via Wikimedia Commons


  • Impact
  • Definition
  • Constraints
  • Assumptions
  • Value range
  • References

IMPACT – What are the impacts of CCGT plants?

In Switzerland, increasing the share of CCGT energy in the total electricity production capacity will have the following impacts:

Energy system

image Increase primary energy demand as it would replace hydro or nuclear that have lower primary energy inputs.

image Increase total fossil fuel consumption.

image Likely to decrease the share of renewable energy sources in the energy mix.

image Likely to decrease energy independence by increasing fossil imports.

image Likely to improve grid stability and security by providing responsive, dispatchable generating capacity.

Environment & Climate

image Likely to increase global CO2 emissions. (Note that this conclusion is specific to Switzerland; in other countries CCGT plants could reduce CO2 emissions)

Society & Economy

image Likely reduce the cost of the energy transition.

image May reduce total cost of ownership of vehicles.

image May worsen balance of payments by increasing fossil imports.

image May increase Confederation income from the tax on mineral oil under the current taxation system.


DEFINITION - What is a CCGT plant?

A Combined Cycle Gas Turbine (CCGT) plant uses two thermodynamic cycles successively to generate electricity with a high overall efficiency. A gas turbine first burns natural gas or heating oil and drives a generator(gas cycle9. Waste heat from the gas turbine is used to generate steam which drives a steam turbine and generates thus additional electricity (steam cycle).

State of the art CCGT plants can reach an overall electrical efficiency of about 50–60%.

CONSTRAINTS - What are the key barriers facing CCGT plants deployment?

• CCGTs are mature, commercial technology that can be deployed comparatively easily.

• A significant shift towards CCGTs would likely, however, necessitate the development of additional natural gas supply transport capacities with neighbour countries.


In Switzerland there are currently three CCGT power plants: Monthey (55 MWe), Pierre-de-Plan (34 MWe) and Cornaux (43 MWe) [1]. These power plants are actually cogeneration plants (heat&electricity generation) because of the existence of a law that fixes a bottom energy efficiency (58.5% for existing plants and 62% for new plants [1]) which cannot be reached unless cogeneration is done. Thus there is no assumption for 2011 as the exisiting plants are part of the centralized cogeneration technologies.

Next tables contain the assumptions that have been introduced in the CCGT energy model of the calculator.

Capacity factor
2035 2050
Efficiency [%]
2035 2050
Without CCS 63 [2]65 [2]
With CCS 57 [2]61 [2]
2035 2050
Without CCS With CCS Without CCS With CCS
CO2-eq. emissions [kgCO2-eq./kWhe] 0.376 0.111 0.361 0.0934
Deposited waste [UBP/kWhe] 0.684 3.88 0.645 3.33
2035 2050
Without CCS With CCS Without CCS With CCS
Specific investment [CHF2010/kWe] 914 1'537 877 1'392


MIN Value: 0 GW

MAX Value:

2035 10 GW


[1] VSE(2012), Centrales à gaz à cycle combiné (CCC)

[2] NEEDS project(2008), Final report on technical data, costs, and life cycle inventories of advanced fossil power generation systems

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combined_gas_cycle_more.txt · Last modified: 2019/10/22 09:17 (external edit)