In Sweden, the frequency market referes to the trading of electricity frequency deviations. The country's power system operates at a frequency of 50 hertz (Hz), and maintaining this frequency is crucial for the stability of the grid. 

Kraftreserv Norden AB invests in BESS infrastructure and facilitate the stability needed to maintain 50Hz. 

First Kraftreserv Norden AB find a location for the BESS, negotiate terms with the land owner and sign a long term agreement for the location.

The next step is developing and financing the site, apply for the necessary permits and install the BESS once all is in order.

The final step is to operate and manage the BESS