Augstsprieguma Tīkls AS (AST) is an independent electricity transmission state system operator in Latvia.

It is also the main shareholder of Conexus Baltic Grid, a unified natural gas transmission and storage operator in Latvia.

[1] In December 2017, AST bought from Uniper Ruhrgas International and Itera Latvija 18.31% and 16.05% stakes in Conexus Baltic Grid, a natural gas transmission system operator in Latvia, for €57.394 million.

[2][3] AST operates Latvian power systems with voltages of 110 kV and above, which is leased from Latvenergo.

Income from electric power transmission network services amounted to 72.6 million euros, or 37% of turnover.