Delivering dual 132 kV substations, 72 km of 33 kV cabling, and full HV integration for one of Scotland’s largest onshore wind farms
Project Snapshot
| Client | Vattenfall Wind Power Ltd |
| Location | South Kyle Wind Farm, Near Dalmellington, Ayrshire, KA18 4QP |
| Principal Contractor | R.J. McLeod |
| Project Value | £14.5 million |
| Duration | May 2021 – April 2023 |
| Market Sector | Onshore Wind – Renewables |
| Services Delivered | Full Electrical Balance of Plant (EBoP) |
| Powersystems Fact | Powersystems has connected over 24% of all UK wind generation sites; South Kyle is one of several major collaborative projects with Vattenfall and R.J. McLeod. |
South Kyle Wind Farm Case Study
Download the full South Kyle Wind Farm Case Study to explore how Powersystems delivered the complete 132/33 kV Electrical Balance of Plant for Vattenfall’s 240 MW flagship onshore project. The PDF provides a detailed overview of our dual‑substation delivery, 4.2 km 132 kV cable route, 72 km of 33 kV array cabling, protection schemes and IEC 61850 SCADA integration. Ideal for engineers, developers and stakeholders looking for deeper technical insight into one of Scotland’s largest renewable energy projects, now powering around 190,000 homes and offsetting 300,000 tonnes of CO₂ each year.
Client & Site Background
South Kyle Wind Farm is one of the largest new onshore renewable developments delivered in Scotland. Featuring 50 Nordex N133/4.8 MW turbines, it provides 240 MW of clean electricity — enough to power approximately 190,000 homes annually and offset around 300,000 tonnes of CO₂ every year.
The project spans East Ayrshire and Dumfries & Galloway and forms Vattenfall’s largest UK onshore wind investment to date. Powersystems was appointed as the Electrical Balance of Plant contractor, responsible for all HV, MV and LV electrical infrastructure, including substations, grid connection, cabling, protection, SCADA and commissioning.
The Challenge
The South Kyle development required Powersystems to deliver one of its most comprehensive HV packages to date:
- Two complete 132 kV substations
- Two 120 MVA grid transformers
- A 4.2 km ducted 132 kV grid connection route
- 72 km of 33 kV array cabling across eight turbine arrays
- High‑voltage protection and SCADA integration
- Interface management with SP Transmission (SPT)
- Large‑scale environmental, logistical and safety considerations
- Maintaining delivery across a multi‑site landscape under varying weather conditions
The project demanded precise engineering coordination and robust construction sequencing to meet all energisation deadlines.
Our Engineering Solution
Powersystems delivered a complete turnkey EBoP solution, including design, supply, installation, testing, commissioning and energisation.
132 kV Connection Substation
- 132 kV outdoor sealing ends
- 145 kV GE Hypact hybrid circuit breaker
- 132 kV earthing, disconnectors and earth switches
- Protection and control panels
- Auxiliary power and metering systems
- 11 kV DNO/internal interface
Main 132 kV Wind Farm Substation
- Two × 120 MVA, 33/132 kV grid transformers
- 132 kV structures and twin‑bay busbars
- 132 kV dead‑tank circuit breakers
- Voltage transformers, disconnectors and earth switches
- Two × 33/0.415 kV auxiliary earthing transformers
33 kV and EBoP Systems
- Sixteen‑panel Schneider WS 33 kV switchboard
- 72 km of 33 kV array cabling, including joints and terminations
- Fully ducted 4.2 km 132 kV cable route
- Turbine and substation earthing systems
- LV, communications, control and signal cabling
- Compound lighting and custom control panels
- IEC 61850 SCADA system
- Full 132/33 kV protection scheme
Project Process
- May 2020 — Civil works commence (R.J. McLeod)
- Late 2021 — Powersystems mobilisation
- 12 May 2022 — Connection substation energised
- 22 Aug 2022 — Main substation + first WTG array energised
- 2022–2023 — Progressive array commissioning, SCADA integration, protection validation
- April 2023 — Full wind farm operational and exporting
Project Facts & Figures
- 50 Nordex N133/4.8 MW turbines
- 240 MW total installed capacity
- Two × 120 MVA grid transformers
- 72 km of 33 kV cabling
- 4.2 km of 132 kV ducted cable
- Eight turbine arrays
- Altitude: approx. 600 ft
- Power for 190,000 homes
- Offsets ≈ 300,000 t CO₂ annually
- Full NERS‑accredited ICP involvement
Technical Specifications
HV Systems – 132 kV
- 132 kV Hypact hybrid CB
- 132 kV dead‑tank CBs
- Disconnectors, surge arrestors, earth switches
- Earthing grid & hot‑zone assessment
- 132/33 kV protection coordination
33 kV Systems
- 16‑panel Schneider WS switchboard
- 33 kV array circuits over 72 km
- Fibre‑optic communication and control cables
Protection, SCADA & Communications
- IEC 61850 architecture
- Full grid‑code protection testing
- Load flow, fault level, harmonic and flicker studies
- National Grid/ SP Transmission interface
LV Systems
- LVAC distribution
- 110 V DC chargers
- Control rooms, HVAC, fire and intruder alarms
Partnerships
- Vattenfall Wind Power Ltd — Project owner
- R.J. McLeod — Principal Balance of Plant Contractor
- SP Transmission (SPT) — 132 kV network operator
- Powersystems — Electrical Balance of Plant Contractor
Key Risks & Mitigations
- Challenging multi‑site environment – Mitigation: Segmented work zones, rigorous sequencing and coordination.
- 132 kV energisation requirements -Mitigation: Detailed TNO interface planning, staged protection testing.
- Large‑scale cable logistics (72 km) -Mitigation: Planned phased deliveries, optimised pull lengths, quality assurance.
- Wide geographic footprint – Mitigation: Multiple daily coordination briefings, comprehensive SHEQ oversight.
Environmental Considerations
- Approx. 300,000 t CO₂ avoided annually
- Major peatland restoration across the site
- Native woodland planting
- On‑site material sourcing reduces transport emissions
- Long‑term environmental stewardship built into operations
Economic & Social Value
- £38 million Community Benefit Fund
- £2.4 million initial investment via Foundation Scotland
- 720 Scottish jobs supported, including 270 in Southwest Scotland
- £93.4 million contribution to the Scottish economy
- £44 million retained in the Southwest region
Future Prospects
South Kyle solidifies Vattenfall’s commitment to Scotland’s renewable infrastructure and strengthens Powersystems’ position as a leading partner for 132 kV onshore wind developments.
The success of this project further consolidates long‑term collaboration between Powersystems, Vattenfall and R.J. McLeod.
Related Projects
- North Kyle 212 MW
- Limekiln 108 MW
- Dorenell 177 MW
- Sandy Knowe 86.4 MW
- Pen Y Cymoedd 228 MW
Delivering a 132 kV grid connected wind farm or major EBoP project?
Powersystems provides complete high‑voltage design, installation, protection, SCADA and commissioning for large‑scale renewable developments.