ESO is a Lithuanian electricity and gas grid operator. It was established in 2016 by merging electricity distribution network operator LESTO AB and joint-stock company Lietuvos dujos and it is controlled by the state-owned Ignitis Group of energy companies. Main activities are electricity and natural gas distribution, guaranteed supply of electricity and natural gas, property connecting to electricity and gas networks, maintenance and development of electricity and gas distribution networks, security and reliability of energy distribution assurance. Under a reform started in 2020, households will be able to choose a supplier out of six, but as of June 2020, the ESO still held 99.85 percent of the market. Commercial consumers are served by 20 suppliers.