Transmission tower surrounded by pine trees, under clear blue sky

150 kV Brattmyrliden - Moliden

SwedenTransmission and distribution

Vattenfall Eldistribution AB, is building a 43 km 150 kV OHTL from Brattmyrliden to Moliden. The line consist mainly of wood poles with composite poles, located in farmland.

  • Vattenfall Eldistribution AB
Time span
  • 2016 - 2017
Service components
  • Structural engineering, analysis and design
  • Transmission lines

The project's objective

EOn Vind is planning a 70MW wind farm in Brattmyrliden. The line will go from UT171 Moliden to EOn wind station in Brattmyrliden. In the 43 km 150 kV OHTL from Brattmyrliden to Moliden, Vattenfall decided to use wood poles with few composite poles where poles are located in swamp/farmland.

EFLA made finalization of the exact line route and tower spotting. EFLA made also geotechnical estimates for foundation design. EFLA designed all the wood poles. For the design of the towers and the foundations, EFLA used specialized Excel Macros along with ICEtow.

One of the challenges in the project was height restriction of wood poles during tower spotting. Tower spotting was also preferred as close as possible to the existing parallel 400 kV line. Tower spotting also includes other restrictions such as nature conservation areas.

Environmental issues

Vattenfall was responsible for the choice of the line route, environmental studies, building permits.

EFLA's role

  • Environmental and risk list (BAS-P)
  • Time schedule
  • Tower spotting
  • Preparation of load tree
  • Structural design of wood poles (approx. 90% of all towers)
  • Preparation of assembly drawing for each tower type
  • Preparation of Sope of Work and Bill of quantities of towers and all other line equipment

Contact our experts

Portrait of a man, green plants and wooden panel in background
Steinþór Gíslason
  • CEO
  • EFLA Group - Energy Solutions
  • Sweden