Construction of the substation and underground cable will begin in April 2021 and be completed at the end of 2022. The substation construction site is located in the Lillklobb area, between Turunväylä and Nuijalantie. The cable route is located between the new Sinimäki substation and the Leppävaara substation on Äijäntie.
Cabling work will begin at the Leppävaara end and progress towards the new substation. Excavation and earthmoving work will be carried out on the cable route, as well as blasting in places. The construction will also have short-term effects on the traffic arrangements of the work area.
The Sinimäki substation will replace the ageing Nuijala substation and will distribute electricity directly to about 15,000 and indirectly to some 140,000 customers, including many enterprises in the area. The cable connection will ensure uninterrupted electricity distribution and transmission capacity in Espoo's high-voltage distribution network.
The project's main contractor is Destia Oy.
Caruna has a total of 16 primary substations in Espoo. The previous primary substation was completed in Suurpelto in the summer of 2019.