Reconstructions

Kurzeme

• As part of maintenance activities, reconstruction of the 110 kV switchyard at the Zaļā Birze substation in Liepāja was carried out, while the upgrading of relay protection, automation and data management systems at the Venta substation in Ventspils was completed.
• Replacement of supports continued on the 330 kV Viskaļi–Brocēni transmission line and the 110 kV Tume–Skrunda transmission line, continuing works commenced in previous years.
• Among the projects co-financed by the European Union, construction of the synchronous condenser stations in Grobiņa and Ventspils, as well as the Battery Energy Storage System (BESS) in Tume, was completed in 2025.
• With EU co-financing, the environmental impact assessment procedure for the construction of the new 330 kV Ventspils–Brocēni–Varduva (Lithuania) transmission line was launched, while construction of the digital Kuldīga substation is approaching completion.
• To facilitate the connection of renewable energy generation facilities and BESS to the transmission system, construction of the new 110 kV Vārme substation was completed. Construction continued on the new 110 kV substations Ziemeļu forti (Liepāja), Cīrava, Platene, Audari and Vāne, as well as the 330 kV substations Tume-2, Zirņi and Padure. Construction of the 330 kV Ēdole substation was commenced, together with the development of new connections at the Brocēni and Ventspils substations for connecting renewable generation facilities. Part of these new energy sources will be complemented by BESS.

Vidzeme

Latgale

Riga 

Zemgale

• Reconstruction of the 330 kV Valmiera (LV) – Tartu (EE) interconnection was completed, while reconstruction of the 330 kV Valmiera (LV) – Tsirguliina (EE) interconnection was commenced.
• Construction of the Grobiņa synchronous condenser station was commenced, while design works for the Ventspils and Līksna synchronous condenser stations continued.
• Reconstruction of the 110 kV switchyard at the Vangaži and Ugāle substations was completed.
• Reconstruction of the 110 kV switchyard at the Lode, Džūkste, Kuldīga, Carnikava, Vairogs, Krustpils and Ogre substations continued.
• Construction of the new Gaujas koks 110 kV substation was completed in order to connect a new transmission system user – SIA Gaujas koks.
• Design works were commenced for the reconstruction of the 110 kV switchyard at the Tēraudlietuve substation.
• A total of 156 supports in poor technical condition were replaced on 110 kV overhead lines, as well as 38 supports on 330 kV overhead lines.
• To meet AS Sadales tīkls’ request for an increase in the permitted connection load at the Valdemārpils substation, a second 110 kV transformer and associated connection equipment were installed. In addition, optimisation of installed capacity was initiated through transformer replacement works at the Ieriķi and Krāslava substations.

• Reconstruction of the 330 kV Valmiera (LV) – Tartu (EE) interconnection and the 330 kV Valmiera (LV) – Tsirguliina (EE) interconnection commenced.
• A contract was signed for the supply and installation of three synchronous condensers (construction of synchronous condenser stations), and design works were commenced.
• Reconstruction of the 110 kV switchyard at the Mīlgrāvis, Šķirotava and Daugavpils substations was completed.
• Reconstruction of the 110 kV switchyard at the Vangaži, Vairogs, Krustpils, Ugāle and Ogre substations continued.
• Design works were commenced for the reconstruction of the 110 kV switchyard at the Lode, Džūkste, Kuldīga and Carnikava substations.
• Reconstruction of the 3.2 km-long 110 kV Torņakalns–Centrālā cable line in Riga, including the section crossing the Daugava River, was completed.
• Construction of the new 110 kV Tārgale substation for the connection of a wind power plant was completed.
• A total of 317 supports in poor technical condition were replaced on 110 kV overhead lines, as well as 87 supports on 330 kV overhead lines.
• To prevent future technological disturbances, 110 kV transformers were replaced at the Salaspils, Suntaži, Grīva, Talsi and Lauma substations.

• Reconstruction of 330 kV switchyards of substation "Krustpils" and reconstruction of 110 kV switchyards of substations "Jāņciems" and "Vilaka" has been completed.
• Reconstruction of "Šķirotava" and "Daugavpils" 110 kV switchyards continued.
• Reconstruction of 110 kV switchyards of substations "Mīlgrāvis", "Vangaži" and "Ogre" has started.
• Design works for the reconstruction of 110 kV sections of substations "Vairogs", "Krustpils", "Ugāle" and "Lode" have been started.
• The replacement of a 3.2 km long cable line in Riga, which crosses the Daugava, has continued.
• A total of 114 supports in 110 kV overhead lines were replaced, as well as 56 supports in 330 kV overhead lines.
• In order to prevent the spread of increased noise in the environment, both autotransformers were replaced in the substation "Bišuciems" by installing one new autotransformer, while the other old autotransformer was replaced by the autotransformer ATNr.3 dismantled in the substation "Grobiņa".
• In order to prevent technological disturbances in the future, 110 kV transformers in substations "TEC-2" (TNr.2), "Gajoks" (TNr.1), "Grīva" (TNr.2), "Iļģuciems" (TNr.2), "Dagda" (TNr.2) and " Olaine "(TNr.1 and TNr.2) have been replaced.
• In order to fulfill the application of JSC "Sadales tīkls" for the reduction of the permissible connection load in the substation "TEC-1", 110 kV transformers TNr.1 and TNr.2 were replaced with lower power transformers.

• The construction of the project "Estonia-Latvia 3rd interconnection" has been completed and the 330 kV high-voltage line from Riga TEC-2 to Kilingi Nomme in Estonia has been put into operation.
• The power transmission line Riga TEC-2 - Riga HPP has been put into operation.
• Reconstruction of 110 kV substation of substations "Jāņciems" and "Ķegums HPP - 2" has been completed.
• Reconstruction of substations "Mīlgrāvis" and "Šķirotava" has started.
• Reconstruction of sections in substations "Daugavpils", "Krustpils" and "Viļaka" was continued, preparations were made for replacement of transformers in substations "Dagda", "Gajoks" and "Grīva".
• For the 110 kV line Madona - Cesvaine - Gulbene, 101 supports were replaced, the replacement of the 62 supports of the 330 kV line Aizkraukle - Salaspils and the replacement of the lightning protection cable for the line from Grobiņa to Klaipėda were started.
• The replacement of a 3.2 km long cable line in Riga, which crosses the Daugava, has started.
• Extended connection options in the substation "Tume" for connecting another wind farm.
• Transformer in substation "Grobiņa" replaced.

• The third, final stage of the project "Kurzeme Ring" has been put into operation.
• Construction works on the project "Estonia-Latvia 3rd interconnection" have started.
• Two new substations "Skrunda" and "Ķemeru parkd" have been built.
• Reconstruction of the substation "Viskaļi" has been completed.
• Transformers were replaced in substations "Dobele", "Tukums", "Priekule", "Kārsava", "Preili", "Balvi", "Latgale", "Mārupe", as well as one 330 kV autotransformer in substation "TEC-1" was replaced.
• Reconstruction of substations "Ķegums HES-2" 110kV, "Daugavpils" 110kV, "Jāņciems" 110kV and "Krustpils" 330kV sections has been started.

• The "Kurzeme Ring" electric line is under construction, and new 330 kV electric lines, "Third Estonia - Latvia interconnection" and "Riga CHP-2 - Riga HPP", are in development.
• As part of the "Kurzeme ring" project, 330 kV switchgear is built at the Tume substation, and 110 kV switchgear is rebuilt at the Tume, Kandava and Dundaga substations.
• At the Aizkraukle substation, the 330 kV switchgear undergoes expansion, and the 110 kV switchgear is rebuilt, with the goal of installing a 330 kV shunting reactor and autotransformer.
• A new 110 kV Skrunda substation ordered by JSC "Sadales tīkls" is built.
• The reconstruction of 110 kV switchgear is carried out at the Bolderāja II substation (including the installation of the new transformer No. 3) and the Viskaļi substation.
• The reconstruction of 330 kV switchgear is carried out at the Daugavpils substation.
• Supports are replaced on 330/110 kV lines, with other investments in electric power transmission systems, to improve their capacity and increase the reliability of the power supply for the clients.

• The completion of the "Kurzeme Ring" project continues: the construction of the Dundaga—Valdemārpils, Valdemārpils—Talsi and Kandava—Tume sections is finished, and they are put into operation. The reconstruction of 110 kV switchgear in the Priedaine and Valdemārpils substations is completed, and the reconstruction of 110 kV switchgear at the Dundaga, Kandava and Tume substations begins.
• According to the applications of JSC "Sadales tīkls", the construction of the new Skanste and Koknese 110 kV substations is completed, and the construction of the new Stīpnieki 110 kV substation continues in Mārupe Municipality; the reconstruction of 110 kV switchgear and the installation of the 110 kV transformer No. 3 at the Bolderāja II substation continues, while the replacement of 110 kV transformers and increase in the permissible load of the Lizums substation are completed.
• The reconstruction of 330 kV switchgear at the Daugavpils substation and the reconstruction of 110 kV switchgear at the Ventspils, Viskaļi and Aloja substations continues; the expansion of 330 kV switchgear (shunting reactor and autotransformer connections) at the Aizkraukle substation and the development of the construction design for the reconstruction of 110 kV switchgear at the Jāņciems, Daugavpils and Ķegums 2A substations begins.
• Taking into account the medium voltage switchgear reconstruction completed by JSC "Sadales tīkls", related work is carried out on the equipment of JSC "Augstsprieguma tīkls" at a number of substations.

• Implementation of the "Kurzeme Ring" project is continued: construction works completed to increase transfer capacity in the substations Tukums, Dzintari, Sloka and Ķemeri; development of the construction project for reconstruction of 110 kV switchboards in the substations Priedaine and Valdemārpils has been started.
• According to the applications of JSC "Sadales tīkls", construction works for installation of a new 110 kV substation Skanste have been started; development of construction projects for the construction of new 110 kV substations Koknese and Stīpnieki and for reconstruction of a 110 kV switchboard and installation of a 110 kV transformer TNo. 3 in substation Bolderāja II has been started as well as 110 kV transformers have been changed and the permitted connection load has been increased in the substations Ezerkrasts, Sigulda and Inčukalns.
• Transformers have been changed in substations Iecava (TNo. 2), Priekule (TNo. 1), Valka (TNo. 2), Lauma (TNo. 2) and Jēkabpils (TNo. 1).
• Works for replacing the 110 kV cable line LNo. 203 Andrejsala-Hanza with plastic insulation cables have been completed.
• Reconstruction of the 110 kV switchboard in the substation Salamandra has been continued.
• Reconstruction of the 110 kV switchboard in the substation Imanta, development of the construction project for reconstruction of the 330 kV switchboard in the substation Daugavpils, reconstruction of relay protection and automatics in the substations Sigulda and Grīva have been completed.
• Reconstruction of the 110 kV switchboard in the substations Ventspils, Viskaļi and Aloja as well as development of the construction project for the reconstruction of the 110 kV switchboard and expanding the 330 kV switchboard in the substation Aizkraukle have been started.
• In light of the reconstruction works, on the side of JSC Sadales tīkls, the reconstruction of the 110 kV transformer medium voltage bus bridges in the substations Kārsava, Krāslava, Grīziņkalns, Zaļā Birzs, Priekule has been completed and reconstruction in the substation Centrālā has been started.
• A 110 kV transformer and auto-transformer reserve area in the substation Valmiera has been constructed.

• Implementation of the "Kurzeme Ring" project has been continued – the reconstruction of the 110 kV substation switchyard “Talsi” has been commenced, as well as construction design for increasing the capacity of substations “Tume”, “Tukums”, “Dzintari”, “Sloka” and “Ķemeri”. Performance of the measures for recording the current condition and monitoring has been started in the territory of the underground water containing sulphides in Ķemeri National Park has been started.
• Reconstruction of the 330 kV substation "Viskaļi” switchyard, as well as reconstruction of the 110 kV switchyard of the 110 kV substation “Dagda” and expansion of the 110 kV switchyard of the substation “Skulte” has been completed.
• According distribution system operator JSC “Sadales tikls” request, the allowed connection load has been increased at the substations „Bolderāja II” and „Salaspils" .
• Transformers have been replaced at the substations “Sloka”, “Ieriķi”, “Aizpute”, “Džūkste” (TNo.1) and “Kūmas” (TNo.2).
• Replacement of the 110 kV cable line LNo.203 “Andrejsala – Hanza” by utilising plastic insulation cables has been started.
• Reconstruction of the 110 kV substations „Salamandra” and „Imanta” switchyards was continued and construction design has been started for constructing the new 110 kV substation “Skanste” and reconstruction of the 110 kV switchyards of the 110 kV substations “Ventspils”, “Viskaļi” and “Aloja”.
• The environmental impact study procedure of construction of the third interconnection Estonia-Latvia has been continued.

• Construction of 2-nd stage of "Kurzeme Ring" project – new 330/110kV transmission line between substations Grobina and Ventspils – has been completed.
• Reconstructions of 110kV substations switchyards „Bolderāja I”, „Olaine” and „Gulbene” have been completed.
• According distribution system operator “Sadales tikls” AS request, the 110 kV transformers in the substations „Cēsis", „Vecmīlgrāvis”, „Priedaine”, „Krasts” and „Bolderāja I” (TNr.2) have been changed, as well as TNr.1 and TNr.2 in substation „Brocēni110" and transformer TNr.1 in the substation „Iecava".
• The technical project development of substation„Skulte” 110kV switchyard expanding has been started, as well as 110kV cable transmission line LNr.203 „Andrejsala – Hanza” changing with plastic insulation cable.
• Reconstruction of Plavinas hydro power plant transmission leading has been completed.
• Reconstruction of substation “Viskali” 330kV switchyard has been started.
• Reconstruction of 110kV substations „Salamandra”, „Imanta” and „Dagda” switchyards has been started.
• Environmental Impact assessment procedure for third Estonian-Latvian 330kV interconnection has been started in Latvia.

• Construction of 1-st stage of "Kurzeme Ring" project – 330kV cable line between substations Riga CHP-1 and Imanta – has been completed. The cable line was connected 330kV electrical ring in Riga town, which will significantly improve security of power supply in Riga city.
• Construction of substation “Ventspils” 330kV switchyard has been completed.
• Substation “Grobina” 330kV switchyard extension has been completed.
• Autotransformer ATNr.1 reconstruction in the substation “Broceni330” has been completed.
• Construction of new 110kV substation “Mežaparks” has been completed.
• According distribution system operator JSC “Sadales tikls” request, the 110 kV transformers in the substations “Madona”, “Tēraudlietuve”, “Aloja” and “Jāņciems” have been replaced by transformers with higher installed capacity.
• The construction of 330/110kV transmission leading to the Riga CHP-2 substation has been completed.
• The technical project development of 110kV substations “Salamandra”, “Dagda” and “Imanta” has been continued.
• Reconstruction of Plavinas hydro power plant transmission leading has been continued.
• Reconstruction of substation “Gulbene” 110kV switchyard and substation “Olaine” 110kV switchyard has been started.

• Reconstruction of the substation “Viskali” 330kV switchyard has been started.
• Reconstruction of 110kV substations switchyards “Olaine”, “Imanta” and “Gulbene” have been started.
• Construction of the new 110 kV substation “Mežaparks” has been started.
• 110 kV transformers in the substations “Dzintari”, “Ķekava”, “Smiltene” (TNr.2) and “Ropaži” (TNr.2) have been replaced by new transformers.
• Construction of the new 110/20 kV substation “Skulte” has been completed.
• Reconstruction of 330kV substations “Imanta” and “Riga CHP-1” switchyards has been completed.
• The 330kV transmission system project “Kurzeme Ring” construction has been continued: 330kV transmission line stage “Grobina-Ventspils”has been started, Daugava river crossing for 110kV cable line Nr.219 and 330kV cable line “Riga CHP-1 - Imanta” has been completed.
• Construction of the new 110/20 kV substation „Pope” has been completed.

• Reconstruction of 110kV substation “Valmiera” switchyard has been completed.
• According distribution system operator JSC “Sadales tikls” request, two 110 kV transformers in the substation “Riga CHP-2” have been replaced by transformers with higher installed capacity. Construction of the new 110/20 kV substation “Skulte” has been started.
• The 330kV transmission line “Kurzeme Ring” 3-rd stage (Venstspils-Tume-Imanta) realisation has been started: the Environmental Impact assesment (EIA) and right of way (RoW) study for transmission line route “Dundaga-Tume” and EIA study for route “Tume-Rīga” has been completed.
• The 330kV transmission line “Kurzeme Ring” 1-st stage (Riga CHP-1 – Imanta) construction has been continued: cable line technical project design has been finished and cable line construction is started.
• Construction works for the new power plant “Riga CHP-2” connection to the transmission network have been started, according to electricity trader JSC “Latvenergo” technical requirements.
• New wind park “Golovigi” connection line to the transmission network and new 110/20 kV substation has been constructed.
• The overhead transmission line LNr.215/216 reconstruction into the cable line has been finished for the stage from substation “Riga CHP-1”until the line pylon Nr.6.

• Reconstruction of substation “Valmiera” 110 kV switchyard has been continued.
• According the JSC “Sadales tikls” request, the 110 kV transformers in the substations “Bišuciems” (1 unit), “Torņakalns” (2 units), “Imanta” (2 units) and “Talsi” (1 unit) have been replaced with transformers with higher installed capacity.
• The 330kV transmission line “Kurzeme Ring” 2-nd stage (Grobina-Venstspils) realisation has been started: the Environmental Impact assesment (EIA) and right of way study (RoW) for transmission line route “Grobina-Dundaga” has been developed.
• The 330kV transmission line “Kurzeme Ring” 1-st stage (Riga CHP-1 – Imanta) realisation has been continued: the technical Project design for route “Imanta – Daugava river” has been developed, and cable line construction under the Daugava river has been started.
• The 110kV line LNr.219 (the sub-project of the “Kurzeme Ring”) reconstruction realisation has been started (the cable line instead of overhead line).
• The 110kV double circuit overhead line LNr.215/216 reconstruction has been started (from substation “Riga CHP-1” until pylon Nr.6 cable line will be installed instead of overhead line).

• Existing substations “Liepaja” and “Grobina” enlargement has been completed, new substation “Liepajas metalurgs” has been constructed, new 110kV cable line “Liepaja – Liepajas metalurgs” has been constructed.
• Construction of the new 110/10 kV substation “Matiss” has been completed, according “Sadales tīkls” AS Riga load increasing request.
• Substation “Valmiera” 330 kV and 110 kV switchyards reconstruction has been continued.
• According the JSC “Sadales tikls” request, the 110 kV transformers in the substations “Liepaja” (3 units), “Carnikava” (2 units), “Purvciems” (2 units), “Bisuciems” (1 unit), “Bastejkalns” (2 units) and “Marupe” (1 unit) have been replaced by transformers with higher installed capacity.
• The 330kV transmission line “Kurzeme Ring” 1-st stage (“Riga CHP-1 – Imanta”) realisation has been started: the technical Project design for route „Imanta – Daugava river” has been completed.