TenneT, the Dutch national grid operator, certified the Greener battery systems for grid balancing solutions. Besides FCR (R1), the mobile Greener batteries are also able to participate in the aFRR (R2) bidding. Thus, the Greener batteries can act as a Frequency Containment Reserve (FCR) to restore the power balance of the grid if necessary within a maximum of 30 seconds. Additionally, they can act as an automatic Frequency Restoration Reserve (aFRR) within a maximum of five minutes. This is the secondary reserve and therefore takes over after the FCR. Therefore, our batteries can be used to eliminate grid imbalances.