Can You Run A Grid Without Fossil Fuels? 

"Yes," says Anders Lindberg, President of Energy and Executive VP at Wärtsilä, on this week's episode of Cleaning Up. It'll just cost €65 trillion extra by 2050. 

Anders' team at Wärtsilä has recently published its Crossroads to Net Zero report, which argues that keeping a little bit of flexible generation on the grid will save huge amounts of money as the globe strives for net zero, while also speeding up the transition to renewables. The argument centres on what to do with the last few percent of power supply, and what forms of generation need to be built to ensure consistent electricity supply and prevent black or brown outs.

Perhaps unsurprisingly for a gas engine manufacturer, Wärtsilä's report makes the case that gas should provide the last few percentage points of electricity generation. Michael Liebreich puts that claim to the test. 

Discover more:

• Wärtsilä's Crossroads to Net Zero report: https://www.wartsila.com/energy/towards-100-renewable-energy/choosing-the-optimal-pathway-for-energy-transition
• Can Germany’s Gas Giant Go Green? Ep206: Michael Lewis - https://www.youtube.com/watch?v=DOD-f6uSPgc
• Q&A: What we do – and do not – know about the blackout in Spain and Portugal — https://www.carbonbrief.org/qa-what-we-do-and-do-not-know-about-the-blackout-in-spain-and-portugal/
• ENTSO-E expert panel initiates the investigation into the causes of Iberian blackout: https://www.entsoe.eu/news/2025/05/09/entso-e-expert-panel-initiates-the-investigation-into-the-causes-of-iberian-blackout

Leadership Circle: 

Cleaning Up is supported by the Leadership Circle, and its founding members: Actis, Alcazar Energy, Davidson Kempner, EcoPragma Capital, EDP of Portugal, Eurelectric, the Gilardini Foundation, KKR, National Grid, Octopus Energy, Quadrature Climate Foundation, SDCL and Wärtsilä. For more information on the Leadership Circle, please visit https://www.cleaningup.live.