1939, December 22. Adoption of the law “On the Establishment of the State Electricity Company Ķegums”. The date marks the starting point in the development of the power system in Latvia. Construction of Ķegums HPP started in 1936, but in 1939, October 16, the first hydroaggregate was put into operation.
1940. In Latvia there were 262 km of 88 kV high voltage lines, about 3700 km of 20 kV lines, 10200 km of 0,4 kV lines, 4 substations; the total capacity of electric power stations reached 121 MW. Generation of electricity - up to 242 million kWh.
1940, summer-autumn. Activities of the Soviet power - expropriation of the power stations, hydropower plants and electric networks owned by private and stock companies. Incorporation of the state electricity company Ķegums into the Energy Entity (Energotrests) of the Local Industry Public Commissariat of the Latvian Soviet Socialist Republic (Latvian SSR). Drafting of the energy sector development plan.
1940, November 1. Putting into operation of the third hydroaggregate of Ķegums HPP.
1941, March. Establishing LATENERGO, a management unit supervised by the Local Industry Public Commissariat of the Latvian SSR.
1941. Establishment of Latvian General Regional Energy supply districts by the authorities of German occupation. During the war period more than 90% of all electrical facilities – power stations, transformer substations, lines and equipment were destroyed.
1944. Restoration and renovation of the devastated energy sector started.
1944, October 14. Putting into operation of a 12,4 kW generator in the cellar of the Riga Central Department Store (Audēju street). Generators found in some factories used for electricity generation as well. Putting into operation of the Sloka Cellulose and Paper-mill and the Jelgava electric power station; both supply Riga with power, too. Two electricity generating trains of 3 and 5 MW sent to Riga to supply the city with electricity.
1944, October 16. Establishing the power industry management unit.
1944, December 7. Establishing the Riga state electricity company LATENERGO with its branch enterprises embracing Jugla, Jelgava, Cēsis, Valmiera, Riga – Jūrmala regions.
1945, November 6. Putting into operation of the first renovated aggregate of Ķegums HPP and restoring two more aggregates by July 1947.
1946, May. Putting into operation of the first restored aggregate in the State Regional Electric Power Station Andrejsala.
1946, June 29. Reorganization of the Riga State Electricity Company LATENERGO, establishing the Latvian Regional Energy Management Authority LATVENERGO.
1946, November. Transferring the management of the urban electrical networks of the Latvian Republic to the municipal services entities supervised by the local Executive Committees.
1950, January 1. Establishing the entity LATVKOMUNENERGO at the Ministry of Municipal Services of the Latvian SSR. SEĻELEKTRO, electricity supply management unit to collective farms and inhabitants in the Latvian country-side functioned up to the year 1954 as by that time Soviet collective farms were denied connection to the integrated network.
1952. Starting the construction of Riga TPP-1. Putting into operation two aggregates in 1955: the first on January 21, the second – at the end of the year, and the third - in 1957.
1953. Putting into operation the fourth aggregate of Ķegums HPP and the station working at its full capacity.
1957. Putting into operation the Brocēni –Ventspils electric transmission line of 110kV.
1957, July 1. Liquidation of the entity LATVKOMUNENERGO. Energy regions transformed into independent cost-accounting units, supervised by the Energy and Fuel Sector Administration.
1958, October. Establishing LATVENERGO as the Energy Sector Management Unit at the National Economy Board of the Latvian SSR. In October- November, due to administrative and territorial reorganizations, transformation of the former energy regions into electric networks - enterprises of LATVENERGO.
1960. Construction of the main electric transmission line of 330kV from the State Electric Power Station Andrejsala to Riga and Šiauliai with a distribution substation at Salaspils. Integration of the Latvian power system into the North-West power system of the USSR. One by one small electric stations closed down as their operation considered to be non-profitable.
1963– 1971. The energy sector of the Latvian SSR controlled and managed by LATVGLAVENERGO.
1965. Putting into operation of the first five hydroaggregates of Pļaviņas HPP. Launching of all ten aggregates on December 21, 1966; the construction of the station started in 1961.
1971-1989. Supervision of the energy sector of the Latvian SSR by the Energy and Electrification Ministry of the USSR.
1974, 5 November. Launching of the first aggregate of Riga HPP. Since 1975 all six aggregates are in operation.
1972. Staring the construction of the second thermal power plant Riga TPP-2. In 1973 the first water heating boilers put into operation. On 22 December 1975 TPP-2 with electric capacity of 63 MW put into operation. Since 1979 the total electric capacity of TPP-2 is 390 MW and heat capacity is 1100 Gkal/h. In 1984 gasification of TPP-2 and since then heavy fuel oil used as reserve fuel.
1979, October. Enlargement of Ķegums HPP completed. Ķegums HPP-2 on the left bank of the river Daugava put into operation.
1987. Starting the construction of the Daugavpils hydropower plant.
1989, January. Reorganisation of LATVENERGO into a production company.
1991. Transforming the production company LATVENERGO into a state enterprise. Demerging of the Power System Facilities Construction Entity and transferring the construction of facilities to private companies.
1991, January. In the barricade days the order of the Central Committee of the Latvian Communist party for Latvenergo to stop the operation of TEC-2 so that to create chaos and the emergency situation. Refusal of the Latvenergo management and the Power Sector Trade Union to execute the order and the Latvian Radio informed to the effect, thus thwarting the plans about a provocation with unpredictable consequences.
1991. Starting the reconstruction of Pļaviņas HPP. Upgrading four hydroaggregates by the spring of 1996.
1992. The Dispatcher Service Centre Baltija transferred into an independent unit. Latvia joining the World Energy Council. Activities of the Latvian National Committee to resume work. Transferring of heat energy production and supply in Daugavpils to the field of municipality competence.
1993. Latvenergo admitted a member of the International Council on Large Electric Systems (CIGRE). Reorganization of the state enterprise Latvenergo into a state joint stock company. Establishment of the joint venture ABB Energoremonts on the basis of the subsidiary company Energoremonts.
1994. Starting the construction of the Latvian National Telecommunication System, using poles of high voltage lines for installing optical fibre cables. Establishing of the joint stock company Liepājas siltums.
1995. Launching of an ERAB financed project, evaluated at 60 million USD, earmarked for renovation and modernisation of Pļaviņas and Ķegums hydropower plants.
1995. Establishing of the subsidiary company Serviss.
1996. Execution of the pilot projects on reconstruction of 110/20 kV substations at Sloka and Ropaži. Transferring of Olaine district heating system and networks to the field of municipality competence.
1997. Contracting a loan with the German company Preusen Electra for the reconstruction of the Riga electric network. Reorganization of the Training and Energy Research Centre. Establishing the Technical Centre. Opening of an exhibition on the company development at the Daugava hydropower plant museum in Ķegums.
1998. Starting the reconstruction of Ķegums HPP-1. Adoption of the Law on Energy in the Parliament (Saeima). Unbundling of the accounting record on production, transmission and distribution. Commercialisation of the Latvenergo subsidiaries by creating profit centres and transition to cost accounting.
1999. Starting the reconstruction of two hydroaggregates of Pļaviņas HPP. Construction of the new indoor substation Venta. Awarding Latvenergo as the leading company in the Baltic states already for the second year.
2000. Vast reconstruction of the substation Andrejsala.
2001. Completing reconstruction of the aggregates in Ķegums HES-1 and Pļaviņas HES-2 . Upgrading and renovation of the TPP substations in Riga, Iecava, Liepāja. Completion of 110 kV loop feeding circuit in Ventspils, connecting distribution switchgear board Ventamonjaks.
2002. Reconstruction of substations in Limbaži, Talsi, Riga HES. Putting into operation of 33 wind generators park near Grobiņa. Registration of the state joint stock company Latvenergo in the Commercial Enterprises Register. Establishing the joint stock company Augstsprieguma tīkls (Highvoltage Network).
2003. Starting the reconstruction of Riga TPP-1. On 20 April 2004 imbedding in its foundation a capsule with the message to next generations. Construction of 110 kV electric transmission line Ķegums-Stelpe. Opening of a new substation Krasts. Reconstruction of the substation Bišuciems.
2004, March 31. Discontinuing the operation of the heating plant Andrejsala.
2005, July. Confirmation of the company’s name to be changed from the state joint stock company Latvenergo to public limited company Latvenergo. The Latvian state is the sole owner of Latvenergo.
