Uppsala municipality, located in the north of the capital Stockholm, is growing rapidly, which means an increased need for electricity. In order to meet the increased need and enable Uppsala’s continued expansion, Vattenfall Network Solutions, in collaboration with Vattenfall Eldistribution AB, is piloting one of the largest battery storage in Sweden as one possible solution to mitigate increased capacity needs.
The area of the battery storage in size is about half a football field and provides a capacity corresponding to what it takes to power the entire Uppsala municipality’s street lighting. Uppsala, like many other municipalities, sometimes has a high load on the electricity grid, especially on cold winter days when industries go on full speed and the households heating needs are great. On those days there may be a transmission capacity shortage, in other words it will be crowded in the power lines.
Building electricity grids takes time, it is a long-term work with long permitting processes before work can begin. Battery storage is faster to build and is one of several solutions to be used until the electricity grid is supplemented.
Battery Storage is part of an innovation project where Vattenfall wants to study how to combine different kind of services as well as study how to control and operate the services. The project will test and evaluate different business models and what it takes to act in different markets, such as the CoordiNet flexibility market, with the battery storage. Other challenges are to identify obstacles and opportunities within the framework of the regulation. The general objective is to identify the services that best fit a battery in order to obtain the best economy in a battery storage.
The new battery and technology are at the forefront. What’s unique about this project is that it can support both Uppsala’s electricity grid capacity as a service for Vattenfall Eldistribution and help Svenska Kraftnät in its role of balancing the frequency in Sweden as a market service from Vattenfall Network Solutions. The battery storage will have a delivery capacity of 5 MW and about 20 MWh – e.g. 4 MW in 5 hours. It consists of four modules and a 10 kV switchgear and will be connected to the 10 kV distribution system.