To address the challenges of the global environment, it is crucial to comprehend the factors that influence the material and energy flows of cities. Megacities, which experience extreme social strains due to their sheer size and complexity, face enormous social stresses, making accessing, sharing, and managing energy and material resources particularly important. Here, we measure the material and energy flows through the top five megacities in the world with populations more than 10 million as of 2010. In general, the resource flows across megacities follow the scaling rules developed in the newly emerging field of cities. Adelaide, Australia Since July 2020, all of Adelaide’s municipal activities have been run entirely on renewable energy. As part of a long-term effort to become carbon neutral by 2025, the city obtains its electricity from wind and solar farms. Energy-efficient structures, campaigns to encourage walking and cycling, and programmes to boost the use of hybrid and electric vehicles are just a few of the measures being taken to achieve this. The Hornsdale Power Reserve is one of the energy storage innovations in which the city has invested. It enables for wider utilization of a range of renewable energy sources and is one of the biggest lithium-ion batteries in the world.
Credit solar energy revolution