With Help From Supercapacitors, Trains Are Providing New Services to the Grid

For the past two years, the Southeastern Pennsylvania Transit Authority has been capturing its braking energy and then selling it back into the power grid. SEPTA’s initial project has been successful enough that it is launching into a second phase, with future expansions already being planned. Other electric modes of transportation, such as electric cars and trucks, are also participating in frequency regulation markets in PJM and ERCOT.