29/06/2021 – Energy / Renewables / Coal / Wärtsilä / Wartsila / Germany / Ukraine / Europe

Replacing coal with renewable generation and flexibility promises European energy independence, Wärtsilä finds
Replacing coal with renewable generation and flexibility promises European energy independence, Wärtsilä finds

Modelling by technology group Wärtsilä has revealed that major system-wide benefits are in reach for European power producers that rapidly replace coal with renewable generation and flexibility – from avoiding fuel and carbon costs, to new clean power export opportunities.

Energy system modelling of Germany and Ukraine – two key European countries with vastly different power systems and policies to phase-out coal – shows that the coal capacity gap can be met cost-optimally with renewable electricity, coupled with flexible resources – i.e., flexible thermal power plants and energy storage.

“Our analysis from both sides of the coal exit spectrum is clear: value has been eroded from coal by low-cost renewable baseload,” said Jan Andersson, Market Development Manager for Europe, Wärtsilä Energy. “The coal phase-out presents myriad opportunities for European countries to cut production costs, achieve energy independence and create revenue through society-wide sector coupling. Flexibility is key to ‘levelling up’ variable renewables to fulfil a baseload role to realise these benefits.”

Germany: ‘Fast Phase-out 2030’ scenario

Wärtsilä modelled a ‘Fast Phase-out 2030’ scenario in which Germany eliminates coal-fired power by 2030 (eight years ahead of target), highlighting that the value of coal-fired power would be eroded by building 13GW of new renewable capacity annually. 

Key insights for Germany include:

• Additional renewable baseload makes Germany less dependent on imports from neighbouring countries during the coal-phase out years, shifting from a net importer to net exporter in the 2030s.


• Germany could save up to 600m tonnes of CO2 by 2045, equivalent to 81 per cent of its national carbon footprint today (compared to phasing out coal by 2038).


• To meet heating demand as coal is phased-out, plus to balance the influx of new renewables, up to 12GW of flexible gas-powered Combined Heat & Power (CHP) is required. 

“In Germany, decisions taken in the next few months will determine whether they ramp up power imports (racking up cost and carbon) from neighbouring countries to fill the capacity gap, or pave the way to becoming a net exporter of clean power to the rest of Europe,” Jan Andersson added.

Ukraine emissions reduction hinges on key upcoming decision

Wärtsilä modelled the outcome of a key decision Ukraine must make in coming months: whether to modernise or retire its coal – to meet its national emission reduction targets. 

Key insights for Ukraine include:

• The power system relying on modernised coal is €5.2 billion (10 per cent) more expensive for consumers over 10 years, mainly due to the cost of domestically produced and imported coal to run its fleet of power stations.

• Modernising Ukraine’s coal power stations will emit 53 million tonnes (32 per cent) more CO2 than retiring and replacing coal with a mix of low carbon technologies between 2022 and 2031.

• A new cost optimal system, based on 32GW of new renewables and flexibility, would save €500 million annually on the cost of generated electricity by 2031.

 “Unlike Germany, Ukraine is not currently able to incentivise its coal exit, so it is vital that they find the lowest cost path to cleanly meeting power demand,” advised Igor Petryk, Market Development Director, Wärtsilä Energy. “Our modelling gives a clear outcome: modernisation of coal is far more costly than retirement and leaves the system more exposed to climate risk, whereas investments into renewables, plus battery energy storage and gas balancing, lead to system-level cost savings,” he added.

About Wärtsilä Energy’s modelling

The Germany and Ukraine models were completed by inputting power system data and scenario definitions into the PLEXOS System Optimiser platform. The platform is focused on finding the cost optimal energy mix by finding the lowest cost solutions for defined scenarios. In the optimisation process, all defined real-life constraints are considered, as well as hourly dispatch and capacity additions.

Learn more here: 

Webinar recording: ‘Value of flexibility is recognised in Germany’

White paper: ‘Flexibility to future-proof the Ukrainian power system’ 

Article: ‘How advanced modelling is helping Ukraine go green’

Article: ‘Sector coupling key to the future of Germany’s clean energy transformation’

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