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The ongoing transition from fossil to renewable energy is said by many within the energy industry to require a more "flexible" electricity system. The suggestion is that the variability of renewable energy resources, alongside the increasing load placed on the electricity grid by decentralized renewable generation and the electrification of heat and transport, requires an enhanced capacity to change the spatial and temporal profiles of electricity supply and demand. Drawing on research within the UK electricity sector, this article contends that electricity flexibility schemes might constitute a socioecological fix for capitalism. I discuss Andreas Malm's claim that the spatiotemporality of renewable energy presents a limit to capital accumulation and suggest that this is a limit that UK flexibility initiatives seek to overcome. The article concludes by suggesting that electricity system flexibility should not be written off as an inherently reactionary sociotechnical project by virtue of its apparent enrollment within the reproduction of exploitative capitalist relations. Rather, I call attention to the political flexibility of electricity system flexibility and, in doing so, further develop ongoing attempts to theorize the socioecological fix in a more politicized manner. [ABSTRACT FROM AUTHOR]

The energy sector provides fuel for much of everyday life, particularly economically and socially. Fighting against the COVID-19 pandemic, a well-functioning and resilient energy sector is vital for maintaining the operation of critical infrastructures, including, most importantly, the health sector, and timely economic recovery. Notwithstanding its importance in everyday life and crises, the energy sector itself is currently in a complex and far-reaching transformation to combat climate change whilst supporting the transition to a low-carbon economy and society, mainly through the development of variable renewable energy sources (RES) such as wind and solar photovoltaics. This paper highlights the need for energy resilience as countries face the triple challenge of the COVID-19 health crisis, the consequent economic crisis, and the climate crisis. Focusing on Europe, it is advanced here that with the ability to balance fluctuating electricity generation and demand, flexibility allows the energy sector to utilise low-carbon RES reliably, ensuring a more resilient and sustainable energy future. This paper derives five urgent policy recommendations for Europe that address possible impacts of COVID-19 on the economic and societal prerequisites for flexibility in energy systems. • Considers the COVID-19 pandemic as an instigator for change. • Highlights the importance of flexibility for resilient energy systems. • Derives five policy recommendations concerning flexibility in energy systems. [ABSTRACT FROM AUTHOR]

• Hydrogen supply curve for decarbonized European energy system 2050. • E-fuels do not restrain benefits of the expansion of the electricity transport grid. • Flexibility and efficiency become the most important properties of electrolyzers. • Marginal hydrogen generation costs of 110 EUR/MWh H2 for 1407 TWh H2 in Europe 2050. • Excess electricity is not sufficient to provide substantial amounts of hydrogen. Alongside substituting fossil fuels with renewable energies and increasing energy efficiency, the utilization of electricity-based hydrogen or its derived synthetic fuels is a potential strategy to meet ambitious European climate protection targets. As synthetic hydrocarbons have the same chemical properties as their fossil substitutes, existing infrastructures and well-established application technologies can be retained while CO 2 emissions in energy conversion, transport, industry, and residential and services can be reduced. However, the conversion processes, especially the generation of hydrogen necessary for all e-fuels, are associated with energy losses and costs. To evaluate the techno-economic hydrogen production potential and the impact of its utilization on the rest of the energy system, a supply curve of electricity-based hydrogen in a greenhouse gas emission-free European energy system in 2050 was developed. It was found that hydrogen quantities of the order of magnitude envisaged in the 1.5 °C scenarios by the European Commission's long-term strategic vision (1536–1953 TWh H2) induce marginal hydrogen production costs of over 110 € 2020 /MWh H2 and electrolyzer capacities of more than 615 GW el. Although the generation of these amounts of hydrogen using electrolysis provides some flexibility to the electricity system and can integrate small amounts of local surplus electricity, an additional 766 GW el of wind power and 865 GW el of solar power must be installed to cover the additional electricity demand for hydrogen production. It was furthermore found that the most important techno-economic properties of electrolyzers used in an energy system dominated by renewable energies are the ability to operate flexibly and the conversion efficiency of electricity into hydrogen. It is anticipated that the shown analysis is valuable for both policy-makers, who need to identify research, subsidy and infrastructure requirements for a future energy system, and corporate decision-makers, whose business models will be significantly affected by the future availability of electricity-based fuels. [ABSTRACT FROM AUTHOR]