Battery Energy Storage System(s) (BESS) is an emerging area of technology being increasingly deployed to support stability and flexibility of modern electrical grids. With much of BESS deployments being privately financed, profitable operation is paramount to the success of the technology. This thesis studies the near-term economic and operation roles of BESS in Sweden, through a case-study of Stockholm Exergi’s operational BESS in Brista. The work surveys existing revenue streams and their trends, as well as potential future services, using examples from other nations to present a hypothetical implementation model in the Swedish system. A model was constructed using GAMS in combination with MATLAB to analyse the spread of services in order to maximise profits from 2022 to 2025. The model was used to analyse how profits and service allocation has been changing over the years. The simulations showed a steady decline in profitability of BESS service participation over the years, mostly de to rapidly falling prices of many frequency-related ancillary services. To mitigate this revenue erosion, the thesis explored several new services where BESS is well sited to participate, but where no market for it currently exist. As many of these markets already exist in some form or another abroad, several examples of successful implementations in other nations were used to underline the technical and economic feasibility of these potential services.
Zeke Lundkvist (Wed,) studied this question.