ELFIN’s power system is a network of electrical components used to supply, transmit, and consume electric power. The scientific payload, ADCS, command and data handling boards, actuators and radios all have specific voltage and current requirements that must be serviced at different times, dependent on the orbit and mission requirements. Per the design, ELFIN has a 60% power margin against the battery specifications, after itemized contingencies. Careful analysis is also given toward the Energy consumption during orbits in eclipse, with specific requirements. For the longevity of the batteries, discharge and charge cycles must be kept at a minimum. Care must also be taken in predicting the power consumed by the torquer coils for repositioning.

The ELFIN Power system has been designed to provide sufficient power to the systems throughout the entire life of the spacecraft. The system includes Spectrolab UTJ cells and rechargeable Lithium-Ion batteries. These components are controlled by PIC microcontrollers to provide proper power to each of the other systems during the ELFIN mission.