ESB Engineering and Major Projects (EMP) are responsible for ensuring the ESB transmission overhead line network at 110 kV to 400 kV is maintained and upgraded to meet the future capacity requirements of a rapidly evolving transmission grid incorporating ever-increasing renewable generation (primarily wind and solar) to meet ESB’s Brighter Future goal.  

The increasing use of new technologies and data, including Unmanned Aerial Vehicle's (UAV’s) and other inspection and data collection and management techniques, facilitates the development of asset health indices vital in planning for reliability-centred maintenance and refurbishment of the overhead line network.

• Over 1,500 kilometres (20%) of transmission network (110 kV and 220 kV) refurbished or upgraded since 2010. 
• Delivery of a similar level of refurbishment and upgrading planned by 2030. 
• Engaged in a major programme to refurbish 500 kilometres of 400 kV lines. 
• Ongoing annual maintenance inspections and condition assessments on up to 7,500 kilometres of transmission lines.