An tSualainn – Electricity supply installations – Stationsprogram O/V77

Prekvalificering – Modernisation of 233 substations in Stockholm A long-term partnership for the future electricity grid

1. Tender – Overview

Procurement Method: Open

Contract Type: ABT 06 (managed contract)

Remuneration: Fixed price with unit prices for variable quantities in civil and building works

Options: Possibility of continuation in future packages with similar scope (total 233 stations planned, 2028-2035)

2. Background

Stockholm's electricity grid is facing extensive modernisation. Ellevio is undertaking a multi-year initiative to improve operational safety, create flexibility in the city's electricity distribution, and ensure capacity for future energy needs. This initiative includes upgrading 233 substations of types O77 and V77 within Ellevio's concession 48. The switchgear in these facilities are approaching the end of their technical and regulatory lifespan, and many stations have components and building parts from the 1980s. This is an opportunity to be a central player in one of Stockholm's most extensive modernisation projects for electrical infrastructure.

3. Project Objectives and Drivers

The project aims to create a robust, future-proof, and easily operable electricity grid in central and outer parts of Stockholm. Through the modernisation of the substations, Ellevio aims to:

- Improve operational safety by replacing LSP and MSP switchgear

- Enable redundancy in cable connections and power supply paths

- Improve fault detection and restoration times through the installation of RTUs

- Improve the working environment through measures in existing buildings

- Prepare for future transformer replacements

- Secure electricity supply in a growing metropolis

This is a strategically important project, both for Ellevio and for the development of Stockholm's electricity grid.

4. Scope – Package 1

The first package includes the modernisation of 23 substations in City, Söderort, and Västerort, to be completed in 2027.

Work Content

- LSP cable laying ca 9,200 m

- MSP cable laying ca 920 m

- Replacement of LSP switchgear in 23 substations

- Replacement of 23 MSP switchgear

- Civil works ca 1,150 m

- Installation of 23 RTUs

- Work with control equipment and AKB

- Tabling and management of temporary substations during outages

- Internal and external building measures in existing substations

The work will be carried out in a dense urban environment, where planning, working environment, and implementation capability are central success factors.

5. Why Participate? – What the Project Offers

This assignment is attractive for contractors who want:

- Long-term and stable volume

Package 1 is the starting point – a total of 233 stations will be upgraded and further packages are planned.

- Complex technical challenges

Ideal for actors who want to work with high-tech solutions, modern switchgear, and advanced operating environments.

- Urban environment in Stockholm

Working in the capital means clear structures, close collaboration, and high technical standards.

- A strategic project in the heart of the energy sector

You will be a key partner as Stockholm builds a more modern and resilient electricity grid.

6. Required Contractor Profile

We are looking for contractors who:

- have clear experience of total contracts according to ABT 06,

- have competence in substations for electricity distribution, LSP/MSP systems, and civil works in existing facilities,

- can drive several parallel projects in an urban environment,

- have a strong safety and working environment culture,

- deliver quality at all levels – from planning to commissioning.