Services
High-Voltage Transmission
& Substation Services
132kV | 275kV | 400kV
Simpson Energy Services Ltd provides specialist overhead line and substation services supporting SPEN, and SSE transmission networks. Our delivery model prioritises safe systems of work, outage efficiency, and right-first-time execution, supporting regulatory commitments under RIIO-T2 and RIIO-T3.
All works are planned and delivered in accordance with client procedures, safety rules, and asset standards, with a strong emphasis on collaboration with Project Managers, Site Engineers, and Control.
Links to Services
SPEN Maintenance and Framework Support
Re-Insulating Tension and Suspension Towers
Emergency Repairs and Line Patrols
Tower Furniture Installation and Asset Modifications
Slack Span Installation and Removal
Substation Works (Down Leads and Gantry Construction)
Major Project Support and Outage Assistance
Authorisations, Competence & Future Capacity
SPEN Maintenance and Framework Support
We deliver maintenance activities in line with SPEN framework specifications, supporting routine, defect-driven, and condition-based interventions. Our experience working within established frameworks allows us to integrate seamlessly with client planning, outage coordination, and reporting processes.
Delivery focus:
Zero harm through strict adherence to SPEN Safety Rules and procedures
Improved asset reliability through timely defect rectification
Consistent delivery against planned outage windows
Accurate reporting to support asset management and regulatory compliance
Re-Insulating Tension and Suspension Towers
We undertake re-insulation works on tension and suspension structures across high-voltage networks, supporting asset life-extension programmes and compliance-driven upgrades. Works are planned to minimise outage durations and maximise productivity during outage windows.
Delivery focus:
Reduced outage durations through efficient work sequencing
Compliance with insulation standards and technical specifications
Safe conductor and insulator handling under approved methods
Quality assurance to reduce repeat interventions
Emergency Repairs and Line Patrols
Simpson Energy Services Ltd provides responsive emergency repair support and line patrols to assist fault location, condition assessment, network restoration and defects. Our teams operate effectively in high-pressure environments where safety, communication, and speed of response are critical.
Delivery focus:
Rapid mobilisation to support fault response
Safe access and inspection in challenging conditions
Early identification of defects to reduce repeat outages
Clear communication with Control and site management teams
Tower Furniture Installation and Asset Modifications
We install and modify tower furniture, including Anti-Climbing Devices (ACDs), step-bolting, in accordance with SPEN, SSE and National Grid asset standards. These works support safety improvements, compliance upgrades, and ongoing asset management strategies.
Delivery focus:
Improved workforce and public safety through compliant installations
Efficient delivery within planned outage or live-line constraints
Accurate installation to specification to avoid rework
Support for long-term asset integrity
Slack Span Installation and Removal
We carry out the installation and removal of slack spans as part of maintenance activities, network modifications, and outage programmes. Our approach ensures controlled conductor handling and safe execution in line with approved lifting and tensioning methodologies.
Delivery focus:
Controlled conductor management to reduce risk
Efficient execution to support outage programme targets
Coordination with adjacent work streams
Compliance with approved methods and safety documentation
Substation Works (Down Leads and Gantry Construction)
We provide specialist support for substation works, installation of down leads, cross leads and gantry construction, working within live and outage-controlled environments. Our teams coordinate closely with site engineers and authorised persons to ensure safe and compliant delivery.
Delivery focus:
Strict adherence to substation safety rules and permits
Accurate installation to reduce commissioning delays
Efficient delivery within planned outage windows
High-quality workmanship to support long-term reliability
Major Project Support and Outage Assistance
Simpson Energy Services Ltd supports major projects and planned outages by supplying experienced, fully authorised personnel. We integrate with principal contractors and client delivery teams to support programme certainty and safe execution.
Delivery focus:
Controlled conductor management to reduce risk
Efficient execution to support outage programme targets
Coordination with adjacent work streams
Compliance with approved methods and safety documentation
Simpson Energy Services Ltd
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