Location: Preston, Lancashire
Capacity: 90MW
Services: ICP, Principal Contractor, EPC, design, civil works, traffic management

Project details

With the cable route from outside the business park to the substation at over 1km long, and being the main feeder to the M6, the local highways team deemed this a highly traffic sensitive network and a critical emergency route in the event of any motorway congestion. Detailed discussions with local highways and businesses were required to ensure that traffic flow was maintained with any potential disruption minimised.

At the same time, and adjacent to the Gas Plant being constructed by Green Frog Connect, a 50MW Battery Energy Storage Plant was in development. In collaboration with this site, Green Frog Connect extended their contract to facilitate the off-site cable route for both developments which subsequently consisted of 4No 33kV circuits and corresponding pilot circuits. Working to extremely challenging timescales, an intricate program and complex traffic management plan was devised and agreed with all stakeholders. By operating continuous shift patterns, a 30% program improvement was achieved, enabling the successful energisation of the BESS site ahead of the Winter Triad trading period and ensuring essential balancing services to the National Grid during high usage periods, mitigating potential power outages.

On site as the Principal Contractor, Green Frog Connect provided full turnkey services for this gas project. Our scope of work included the design and construction of the balance of plant, including switchgear, transformers, power and control cabling for the client’s SCADA
system, security control systems and auxiliary power supplies, along with the design and construction of the civil works including ground works, reinforced concrete structures, fencing and access roads.

Following the successful sign off of the revised G99 commissioning procedure for the site’s 27 GE Jenbacher gas engines, the site was available for the client to trade and meet its Capacity Market obligations.

Our project management resulted in a 30% program improvement for the off-site grid connection cable works ensuring supplies were available ahead of the Winter Triad trading period.

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With over 20,000 hours worked, the project included very high risk work including excavations, major crane lifts, high voltage works and working at height. Early site clearance works were initiated in January, in anticipation of the auction, with full mobilisation immediately following the results. Design and planning works had already been completed well ahead of the auction.

Tom Drake, Director of Green Frog Connect, said, “This project demonstrates the impact of our commitment to the continuous improvement of Health and Safety practices. We’d like to thank all our team, and our sub-contractors, who have worked together to maintain high safety standards whilst delivering the project ahead of schedule.“

The construction of this small-scale gas fuelled capacity mechanism embedded power plant, within a 2,400m2 compound, included the construction of foundations to accommodate electrical equipment including generators, transformers, the switchroom and containerised units. High and low voltage cabling has been routed around the site, which is bordered by a sheer cliff on two sides, a site of special scientific interest (SSSI), and a busy industrial estate.

Adrian Sherman, Green Frog Connect’s SHEQ liaison on the project, said, “Considering the number of working hours and all the hazards faced throughout the construction of the site, this is a fantastic achievement which we are rightly very proud of.“

Despite the challenges and tight timescales, the site was generating and available for export from mid-September and is now available to respond to Capacity Market Warnings issued by National Grid. The Capacity Market exists to ensure long-term security of supply by ensuring there is sufficient generating (or demand reduction) capacity at times of system stress, for example when renewable sources are not producing at a time of high demand.

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Location: Gloucestershire
Capacity: 40MW
Project length: Nine months
Client: Viridis 178 Ltd

Key client benefits

• Worked closely with all stakeholders to complete a directional drill under the River Severn and a major oil pipeline crossing on budget and on time.
• Developed an innovative solution to deal with asbestos when it was unexpectedly found on site, resulting in no cost impact for the client.

Project details

Over nine months, Green Frog Connect acted as the principal contractor as well as the Independent Connections Provider. Our services comprised:

• The design and construction of the electricity grid connection contestable works, including a single 40MW tee-off connection to the Western Power Distribution 33kV network.
• The design and construction of the balance of plant, including switchgear, transformers, power cabling systems, SCADA/control system, the auxiliary power system and a security system.
• The design and construction of the civil works including ground works, reinforced concrete structures, fencing and access roads.

The installation and commissioning of the 27 GE Jenbacher Generator Sets, and the gas connections, were undertaken by Green Frog Genovate and Green Frog Gas Utilities respectively. The site is now dispatched by Green Frog Trading to ensure Capacity Market events are met, and also operates on the open market providing power at times when renewable generation is low, and/or when demand is high.

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Green Frog Connect are looking forward to supporting Virids 178 with their plans to develop a number of back up gas power plants across the UK.

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