February 2020: Research paper published by the Journal of Cleaner Production Volume 245, 1 February 2020′ (open access) which – whilst not on London (a case study from Poland) – sets out the route for assessing what the potential maximum contribution of rooftop solar could provide in meeting the energy demands of a city.
The city of Wroclaw has a high level of industrial energy consumption and the study concludes “[a]lthough energy storage, in the form of batteries, slightly improves both the autarky and environmental indices, the relation between potential PV generation and load makes them very infrequently useful (mostly in summer) and not economically justified.”