AS Augstsprieguma tikls (AST) is an independent transmission system operator in the Republic of Latvia, engaged in providing electric power transmission network services and ensuring the balancing and stability within the transmission network.

The electric power transmission network consists of interconnected networks and equipment, including cross-border connections with voltages of and above 110kV, which are used to transmit electric power from the producers of electric power to the relevant distribution network or end-users.

Mission: To ensure continued, reliable and sustainably effective power transmission throughout Latvia.

Vision: To become the leading transmission system operator in the region that has operatively and successfully implemented development-aimed changes.