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Coal Importers statement

Coal Importers statement

(Posted on 11/11/19)

Germany’s Coal Importers Association has released a statement following a new Deloitte study.

“Hard coal-fired power plants can take over the task of system stabilization. This was shown by the

Deloitte study " Assessing the flexibility of coal-fired power plants for the integration of renewable energy

in Germany " (Deloitte Finance, November 2019), commissioned by VDKi, with a what-if calculation.

From a purely technical point of view, the existing coal-fired power plant park in Germany (2018) could

absorb and integrate growing proportions of variable renewable energies of 50%, 60% or 70% without

endangering the reliability of the electricity supply. However, the average capacity utilisation of the

existing coal-fired power plant park (2018) would fall in the 50% renewable energies scenario to just

over 30% and in the 60% and 70% renewable energies scenarios to around 20% and 15%, respectively.

• In "dark doldrum periods", i.e. periods with limited output from wind and solar power plants, lasting

one to three days, coal-fired power plants generate twice as much electricity as on an average day

if the share of renewable energies is 50%, and three and a half times more electricity if the share

of renewable energies is 70%.

• Germany becomes a net importer during the "dark doldrum periods". The scope for compensation

through higher imports is limited by the availability of available facilities in Germany's neighbouring

countries and the overload of interconnectors.

• Almost three quarters of the installed power plant park generate heat and electricity (CHP) at the

same time. Most CHP plants can switch flexibly between heat and electricity as long as the

electricity generation is not limited by the heat demand in the cold season. Retrofitting heat

storage tanks can improve the operational flexibility of coal-fired power plants.

The study did not rely on very low gas prices for power plants. According to experts, the current price

level will not remain so in the long term. According to the current market assessment of the gas industry,

there are no suitable framework conditions for existing purely electricity-operated gas-fired power plants

to continue operating economically beyond autumn 2020.

The scope of the Deloitte study was limited to a what-if calculation. In addition, it should be noted that

only high-efficiency combined cycle gas turbine power plants should be supported under cogeneration.

Although open gas turbines and gas engines, in addition to coal-fired power plants, would currently be

an option for flanking the further expansion of renewable energy sources in the dark and cold seasons,

modern coal-fired power plants are more favourable in terms of emissions than open gas turbines. If

one considers the emissions over the entire chain of effects from the borehole/mine to the power plant,

hard coal is at least on a par with natural gas, as current studies show.

For this reason, open gas turbines or gas engines should only be built where power plant capacity is

required for grid-related reasons that cannot be provided by existing coal-fired power plants. The

Association of Coal Importers therefore appeals to all political actors to use the capabilities of flexible

coal-fired power plants to stabilise the system and thus integrate renewable energies within the

framework of the energy system transformation and to put an end to coal-fired power generation

accordingly.”

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