The main purpose of the Estlink connection is to secure power supply in both regions to integrate the Baltic and Nordic energy markets.

Negotiations between Eesti Energia, Pohjolan Voima, Helsingin Energia, Graninge (now E.ON Sverige), Latvenergo, Statkraft and TXE Nordic Energy, a subsidiary of TXU (now Energy Future Holdings Corporation) started In 1999, and on 9 October 2001 a contract was signed in Tallinn.

[4] However, only after the harsh winter of 2002–2003 which resulted in an increased demand for power, the project of the submarine cable between Estonia and Finland got a boost.

[6][10] Construction of Harku converter station and land cable installation begins on 5 April 2006.

Concerns about potential sabotage have arisen due to recent outages in the Baltic Sea region, although subsea cables are also prone to technical malfunctions and accidents.

Finnish Prime Minister Petteri Orpo confirmed that authorities were investigating the incident.

[35] At early evening, the Finnish Border Guard escorted the tanker Eagle S, a part of Russia's shadow fleet according to Lloyd's List, to Porkkalanniemi.

[1] The 12-kilometre (7.5 mi) long underground cable starts at the Püssi substation and runs the coast of the Gulf of Finland at Aseri.

[24] Estlink 2 will be a classic bidirectional monopolar high-voltage direct current connection with line-commutated converter thyristors.

[37][38] On June 28, 2022, Elering and Fingrid signed a memorandum of understanding to begin planning for a third submarine cable, EstLink3, with a capacity of up to 1000 MW, expected to be completed by 2035.