Integration of geological compressed air energy storage into future energy supply systems dominated by renewable power sources

•Framework development for geological energy storage evaluation in renewable energy systems.•Integrated assessment of compressed air energy storage in porous formations (PM-CAES) for future energy systems.•PM-CAES may provide up to 50 GWh electrical energy for periods of up to 18 d.•Geotechnical optimisation of achievable power may be achieved through innovative well design.