Under the agreement, KLM will become a TCR customer for the maintenance and lease of ground equipment, while KES/TCR will be responsible for investment in equipment. KES, a wholly-owned KLM subsidiary, handles the maintenance, fleet management and refuelling/recharging of vehicles and equipment required for ground handling at Schiphol. KES is also owner of the ground power units (GPUs) used by airlines to supply aircraft with electricity on the ground at Schiphol. KES employs around 100.