GE-ALSTOM TRANSACTION Effective 2nd November 2015, GE acquired Alstom’s energy businesses. The Alstom content available on this site is for information purposes only.
Click here for more information.

Renovation, modernisation and extension

Alstom Grid provides condition assessment of substation including third party Original Equipment Manufacture with support in decision making process and solution for renovation, modernisation or extension for the equipments requiring improved performance or to resolve some obsolescence issues.

High Voltage substations are key contributors of the Grid assets value while they are critical for Grid reliability and availability; after decades of operations, Grid operators may foresee risks of increasing failure rate according to electrical and environmental stress, also they may address the needs for evolving power demand or the needs for standard or technological enhancement.

Alstom Grid service experts support the decision-making process providing the most cost efficient solution for substation and products renovation, modernisation or extension based on condition and life assessment 

Key benefits 

  • Optimisation of reliability and performance of equipments and substation
  • Adaptation of equipment to current needs and technologies
  • Cost efficiency and short lead time compared to a replacement
  • Higher return on investment
  • Worldwide manufacturing experience


Modernisation of equipments is a way of getting benefits of new design and technology on equipment already in operations as well solution for service obsolescence challenges on old equipments such as:

  • GIS modernisation
  • Add-on Condition monitoring system allowing condition monitoring services and condition base maintenance
    - MS-3000 on transformers
    - CB-Watch on Circuit Breakers
    - B-Watch & PD Watch on Gas Insulated Substation
  • Disconnector motorisation


Alstom Grid offer solutions to expand the life of ageing equipments by replacing worn circuit breakers, switches, control and protection, processing transformer oil… such as:

  • Power Transformers Life extension
  • Circuit Breaker Mid-life Overhauling
  • GCB forklift Upgrade

Extension & Upgrades

Increasing Electrical ratings such as nominal current, short-circuit current, breaker tripping time, protection performances, nominal power, adding bays in existing substation are common demands addressed by Alstom Grid Engineering team, such as:

  • GIS Bay Extension
  • GIS Upgrade
  • Transformer Cooling Upgrade