This paper aims to meet the challenges of large-scale access to renewable energy and increasingly complex power grid structure, and deeply discusses the application value of energy storage configuration optimization scheme in power grid frequency modulation. . As the Swedish power system has increased its shares of production coming from intermittent renewables, the production coming from large rotational units as nuclear, and hydropower, has decreased. FCR is a fast power activation that activates automatically and proportionally in response to a deviation in frequency within certain intervals. Based on the equivalent full cycle model. . When citing this work, cite the original published paper. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, or. . These stations can function as energy storage facilities to help balance peak-hour electricity demand. Nio currently operates 60 battery swap stations across Europe, including 8 in Sweden. Image. . The Nordic region benefits from large hydro reservoirs that provide excellent and cost-effective energy storage options, which are already being efficiently utilised.