My research problem is that there are different ways to organize a chief guardians office at the same time as the Deputy Inquiry (2021:36) gives suggestions on making one type of organization form mandatory. The chief guardians are not uniform and the muncipalities can organize their chief guardians office in different ways. At the same time, the Deputy Inquiry (2021:36) have given a proposals to restrict municipal self government in order to ensure increased quality and legal certainty in the exercise of authority through a certain type of organization.The purpose of my thesis is to shed light on muncicipalities choice of organizational form for their chief guardians office and officials perceptions of its advantages and disadvantages of the same. The thesis theoretical framework is partly organizations as instruments, partly the values of democray, rule of law and efficiency. I use a qualitative reserach design where my material consists of interviews and public documents. My conclusion is that there are different reasons/purposes for the chosen forms of organization. The purposes are not identical with each other. The purposes also differs between whether the chief guardians office is conducted in-house or through collaboration.My thesis shows that the pros and cons of the different types of form of organization differs.Regardless of whether the organization is in collaboration or under its own auspeices, the bord of chief guardian or chief guardian can contribute to organizational structures that can have different advantages and disadvantages. Chief guardians that are organized via intermunicipal collboration can easily recruit personel, has judicial competence and has more personel. They also contribute to increased uniformity over a larger geographic area. But they can also have negative effects such as can be derived from structure. An unexpected but interesting finding that emerged during my work is to be ”made visible”. In my analysis Iargue that democracy maybe is the value that underlies efficieny and rule of law.There are perceptions about a most appropriate way to organize the chief guardians office of. My conclusion is that the joint committe is perceived to be the most appropriate form of organization.

The main purpose of this thesis was to develop and evaluate Key Performance Indicators (KPIs) and battery usage associated with Lithium-ion Battery Energy Storage Systems (LiBESS) used as Frequency Containment Reserve (FCR). The investigation was based on three of Vattenfall´s LiBESS projects that use the same lithium-ion battery technology but vary in system rating and configuration. It was found that two of the most important KPIs are response time and energy efficiency. The response time describes how fast the system can respond to changes in grid frequency. Additionally, the energy efficiency describes how effectively the system can provide energy storage during service and it can be parametrized into the efficiency of the battery, converter and transformer. The results show that all the considered LiBESS can fulfill the response time requirements of 30 seconds for FCR provision. In the future stricter requirements for the response time in grid stabilization services will most likely be required. Nevertheless, the results showed that a well configured LiBESS can provide response times on the millisecond scale. The energy efficiency evaluation showed that the system energy efficiency decreased from 89% to 85% when the power increased from 50% to 100% of rated power. At 75% of rated power it was found that the converter had the lowest efficiency (92%) based on the analysis of the efficiency of all the system components. It was also found that the power consumed by auxiliary loads was nearly constant for the examined power rates and that it significantly reduced the energy efficiency. Lastly, the battery usage analysis showed that the battery often idles or operates at low power rates if the frequency dead-band of ±10 mHz is applied around the nominal value of 50 Hz. Moreover, the battery usage can be characterized by an average State of Charge of 50% and a maximum Depth of Discharge of 30% during both charge and discharge of the batteries.