hat’s the objective, but is this feasible? How could it happen? These are big questions, but vitally important ones. Two reports have been released which provide insight to this (1) provides a detailed discussion of the potential of different technologies to contribute to an energy independent exeter. Whilst also considering the issues and barriers to its realisation. (2) outlines the energy strategy of Exeter city council who aspire to become 100% renewable energy, and energy neutral by 2022. There is a key difference between these two terms; energy independence and energy neutrality. Energy independence describes a system which is totally independent of any other supply, generating all the energy it needs when it needs. Energy neutrality simple requires a system to generate the same amount of energy as it uses over a period of time. The intermittency of renewable energy means energy neutrality would put a large strain on the grid, exporting a lot of energy to the grid at times of excess generation and having a large energy deficit at time of high demand.
To make the transition from energy neutrality to energy independence, storage is required. Acting like a big sponge, it’s able to store and provide energy on demand. But how much storage would be required to make Exeter energy independent? We built an energy model of Exeter on matlab to investigate this.