Energilager i kyrkan och dess systemnyttor : Batterier i kyrkan och hur de kan bidra till ett stabilare elnät

Sammanfattning: Many of the over 3300 churches in Sweden are only used a couple of times a week and are kept cold in between sessions. The occasional heating results in a power spike which burdens both grid and wallet in form of an increased grid fee. With the help of a battery and peak shaving, the peak can be lessened. While the battery is not used for this purpose it can instead be used to support the grid. The aim of this project was to investigate how this could be achieved. As the energy production strives towards more sustainable methods, new problems in the grid can start to show up. One problem is the lack of rotational inertia in a new wind and solar based energy system. That will lead to new problems keeping the correct frequency of 50 Hz in the grid. To keep the frequency in an acceptable range, the Swedish transmission system operator (TSO), Svenska kraftnät, buys stability services which can come from the batteries in the church. Various stability services are available such as FCR and FFR. In this report calculations were made to research the potential profit if stability services would have been sold during 2022. The result shows that the profit was quite high, the investment cost of the batteries would be paid off in just a couple of years. In addition to this the batteries can also be used to support the local grid, participating in local flexibility markets, or even helping with voltage regulation or power factor compensation if the need should arise. Under the current economic circumstances, batteries would be a beneficial investment for parishes within the Church of Sweden, both from an economical and societal point of view.