Case Studies:





The Brief

Our client is a major UK based data centre developer and operator, providing third party data centre solutions to private businesses and public-sector offices. At the Cody Park Data Campus in Farnborough ESM Power's client was looking to upgrade and improve resilience to the existing High Voltage network and enable both the short term expansion of this high integrity data campus and also put in place the provision to increase capacity for future expansion in the long term.

The Site

Cody Park Data Campus is located in Farnborough, Hampshire. The site sits within the Scottish & Southern Energy Power Distribution (SSEPD) DNO footprint.

Our Work

Under this scheme ESM Power was appointed as Independent Connection Provider (ICP) and Principal Contractor. Our remit as ICP was to design, procure, and commission the new electrical infrastructure to SSEPD's standards to enable delivery and adoption for the 33kV upgraded connection. Included within our scope was the building and civil works for the new substation.
The project was managed by ESM Power in line with CDM Regulations and subject to on site audits from SSEPD and an independent CDM consultant.

Building and Civil Works

In order to meet the client brief the scheme required a complete new build substation that would combine the infrastructure and assets to provide both a 33kV/11kV capability combined with a 132kV/33kV capability. ESM Power's scope encompassed all associated civil works including excavations, footings, plinths, bund walls, drainage, kerbing and service road construction to an asphalt finish.
ESM Power's work also included the construction of a steel framed and cladded switch room to SSEPD specifications. This would be used to house the client's 11kV switchboard and SSEPD's 33kV switchboard. This construction element involved specialist contractors, crane hire, a crane operative, slinger/signaller, a lift plan, crane inspection conformity report, lifting equipment inspection and conformity test report and working at height - with fall arrest systems in place.

Electrical Works
The HV electrical works included the delivery, installation and commissioning of an 11kV switchboard, a 20/40 MVA 33kV/11kV transformer, protection panels, earth installation (including earth resistivity testing) and all other works associated with a new primary substation.
Part of the network security and reinforcement works also included the installation of 3 No. 11kV interconnector circuits between the new primary substation, under ESM Power construction, and the existing Cody Park primary substation.

Project Completion
Throughout the construction programme all works conformed and adhered to the method statements. Risks were monitored and addressed daily and a strict adherence to the wearing of appropriate PPE for the relevant task and being in possession of up to date competency certificates and authorisations was rigorously enforced.
We are again proud to report no accidents or injuries during the works at Cody Park by ESM Power - something we continually strive to achieve during our day-to-day operations.
This project commenced in April 2016 with works completed, on time and to budget, by March 2017.



ESM CONNECT - Cambridge North

ESM Power Ltd have been appointed by Brookgate Ltd for a major project at CB4 Cambridge North.

Cambridge North is a large mixed development, located adjacent to the new Cambridge North Railway Station. The project includes shops, offices, cafes, restaurants and a 217-bed 4 star Novotel hotel.

The Work

We were previously contracted by the developer, Brookgate Ltd to perform a services survey and proving exercise and divert all services within the Hotel and Office development. We also provided the Temporary Builders supplies for the Hotel and Office development.

We are currently instructed by Brookgate Ltd to provide a full multi-utility solution for Gas, Clean and Waste Water, BT, Private Comms and a 12.4 MVA, 11kV supply for the Main services spine to accommodate all future developments. We are also instructed to install full Multi-Utility to the Hotel and Office developments (including 2 substations) for phases 1a to 2g.

Working with two main contractors ESM Power's work includes:

• The Hotel and Office supplies (2No substations) are fed from a local Point of Connection which also reinforces that part of the UKPN infrastructure.

• On-site civils on a phase by phase basis for McAleer & Rushe's Novotel development and Wates Construction's office development.

• Provide, install and commission 2No package substations complete with high voltage ring main unit and low voltage fuse pillar


• Excavation off-site to existing MP PE gas main. installation of 662m x 125mm gas main in new footpath/cycleway

• Supply and installation of PRS (including concrete bases) and commissioning

• Installation of 600m onsite gas mains and installation of 2 no. 63mm gas services, steel pipework and manifolds

Clean Water

• Excavation off-site, 100m in soft ground and 662m through existing footpath from the connection point on Cowley Road to site

• Arrangement of Highway Opening Notice and Traffic Management

• Installation of 1,580m of on-site water mains

• Testing and chlorination of mains pipe

• Installation of 4 no. water services

• Arrangement of water meters installation with Cambridge Water

Waste Water

• Installation of Foul Water rising main as per Mott McDonald design

• Installation of Air Valve Chamber, Wash-out Chamber and Break Chamber with gravity fed VC pipe to Anglian Water Point of Connection


• Installation of 2 way BT ducts to BT Open Reach design

Private Comms

• Installation of 8 way duct system



ESM CONNECT - Spring Park

The Brief

ESM Power Ltd were contracted by the client to design, engineer, procure and construct a new 33kV/11kV primary substation to provide a firm 48MW power supply for the extension of this existing data centre development. ESM Power would also be required to provide project management and safety management for the contestable works and CDM roles of Principal Designer, Designer and Principal Contractor for the works.

Under this contract ESM Power would also represent the client and manage the point of connection (POC) interface with the local Distribution Network Operator (DNO).

The site

The site at Corsham, Wiltshire sits within the SSE Power Distribution (SSEPD) footprint.

Our work

The main substation compound consists of three 33kV/11kV transformers, a steel cladded building housing a three section, twenty-two panel 11kV switchboard, associated protection panels and Scada equipment - all to be adopted by the client and an IDNO. This project also consists of a 33kV, 3-phase, 8-kilometre cable route from the new substation to the POC onto SSEPD's distribution network which was also adopted by the IDNO.

The new primary substation would have shared building facilities and contain equipment owned and operated by both the IDNO and the client.

ESM Power's responsibility for the project in line with CDM regulations included planning, managing and monitoring all risks on site, ensuring all contractors followed ESM Power's site safety rules and were aware of all risks with the potential to cause harm.

The project brought its own very specific and interesting challenges. Owing to the location of the 8km cable route within this part of Wiltshire archaeologists were involved for the entire excavation phase. During the works a Roman road was uncovered and ESM Power worked closely with the county archaeology team to ensure our responsibilities were carried out to the highest level. The route also traversed through farmland and MOD grounds.

Commissioning and Completion

Following completion of the installation phase, ESM Power was responsible for the commissioning of all equipment including liaison with SSEPD to ensure energisation was achieved as per the commissioning and testing programme and SSEPD's requirements.

The project began in March 2016 and was completed within the programme schedule, ready to be energised in early 2017.

The cabling to the customer's site and the two metered substations was adopted by SSEPD on completion. All aspects of this including design, materials, plant, installation and testing was in accordance with all codes, practices, procedures and specifications defined by SSEPD.

Crucially ESM Power completed this project with zero injuries or accidents to any personnel involved with the work. A great achievement and testament to our ongoing high standards in safety management.



ESM CONNECT - Television Centre

ESM Power were chosen as principal contractor to design, project manage and deliver the 11kV Infrastructure and LV metered connections to the Television Centre, Wood Lane, West London.

The site

The development of the former BBC TV studio at White City, once the building where Morecombe and Wise put the National Grid under pressure due to the sheer number of people tuning in, has been transformed into 14 acres of village including gardens, cinema, café's and luxury apartments and penthouses with prices starting at £900,000 rising to £7m.

Our work
Four 11kV Points of connection were provided by UKPN from their HV switchgear room onsite to cater for the 10,598kVA load required.

ESM Power designed, procured, installed and commissioned:

Plot A—1 No. 1000kVA package substation, LV service cables to 6 commercial units and 2 No. 3200kVA HV metered substation RMU's for commercial units.

Plot B&C substations 1 & 2 - 2 No. 1000kVA package substations. Plot B&C substations 3 & 4 - 2 No. 1000kVA package substations. LV distribution equipment, service cables to 4 Landlord supplies, 6 commercial units and 432 apartments.

BBC Studios 1-3 - 2 No. HV metered substations

Plot G2 packaged substation - 1 No. 315kVA integral package substation

ESM worked with multiple clients and contractors to deliver this project on time and on budget



ESM CONNECT - Coltishall

ESM Power were chosen as the main contractor to connect a 27MW solar farm to the grid.

Scottow Moor Solar Ltd is a company that was specifically created to develop the solar farms including this one near Norwich. They have extensive experience in renewable energy projects in the UK and overseas.

The site

Using the former RAF base of Coltishall, Norfolk County Council's vision was to use the land to its full potential, generating income, creating jobs and protecting the site's heritage assets. After deciding that a solar farm was the best use of the land, applications were approved and the first phase started in February 2015.

Our work

ESM Power Ltd were chosen as one of the main contractors to help realise the potential of generating enough clean energy to power around 12,000 homes and saving 20,000 tonnes of CO2 each year. Our first phase was completed within a very tight deadline and included:

• Designing and installing both the DNO and customer 33kV substations and switchboards

• Civil and electrical designs

• Procurement, installation and commissioning of all equipment

• Connecting 27MW of solar generation to the grid network

Phase two

After the successful first phase, we began phase two which included all of the ICP work and a 33kV DNO connection. We also added a further 20MW to the grid connection as well as four new circuit breakers and two switches. The four customer substations had three 500kVA transformers and another 200kVA transformer added.

ESM Power worked with several contractors as well as using our own resources to complete the work and saw us responsible for the LV changeover as well as all commissioning, cable installations, terminations, and excavations.

The site also presented challenges we had to overcome, including contamination from asbestos and obstructions underground from existing services.

We were delighted to work on this major clean energy project. The scheme involved an imaginative design solution to enable the connection of five separate 5MVA solar parks to the same point.



ESM CONNECT - Troughton Solar Farm

The site

Covering around 100 acres, this flat site powers over 7,500 homes and saves 10,750 tonnes of CO2 emissions every year.

Our work

ESM Power Ltd was chosen for the design, procurement and construction of a new 132kV sub-station to accommodate the 25MW export to the point of connection on Western Power Distribution (WPD) network. Design commenced in February 2015 with construction starting in August 2015 and completed in March 2016. The wet weather in late winter was a particular challenge but we overcame all obstacles to get the project completed on time. Among a range of works, we carried out the following design, build, commission and handover to the DNO:

•   A detailed civil and electrical design to WPD's specifications for the 132kV metered substation and private substation

•   Earth resistivity testing and earthing design

•   Supply and construction of the support structure for the surge arresters and three disconnectors 

•   Supply and installation of a 132kV metered circuit breaker, a 132kV to 33kV 25/30 MVA distribution transformer complete with a 33kV three-panel switchboard 

•   Supply and installation of a 50/100kVA auxiliary transformer 

•   Directional drill under the M5 motorway as part of the cable route 

•   Full commissioning including G59

This connection is ESM Power's second 132kV site and has added 25MW of solar connection to our portfolio.




Ruskin Square is a large mixed development, located in the heart of Croydon's central business district. The project includes residential units, shops, cafes, restaurants and appealing public spaces. There will also be fast and easy access to central London as well as excellent public transport connections.

Our work

We are contracted with the developer, Stanhope Plc who have over 30 years of experience and an impressive track record. Stanhope Plc chose ESM Power Ltd to provide a connection of 16.4 MVA, 11kV supply to Ruskin Square.

Work began in 2013 and will continue over the next 10 years as the site is developed in stages to include four residential buildings which are all low voltage (LV) metered and five commercial buildings which are all high voltage (HV) metered.

To date, ESM Power has provided the following:

• A temporary building supply connection for residential number 1 development

• Three 11kV circuits to the main site from UKPN Croydon Central Substation

• 11kV supply to the first residential development

• A temporary building supply to building number 3

• 11kV supply to the second residential development and box park

For the initial phase of the development, we provided a temporary building supply by installing a UKPN approved ring main unit and a private customer transformer which was energised in March 2014.

The permanent supply to residential number 1 involved the connection of three 11kV feeders to the site into a UKPN approved trunk feeder unit.

A UKPN approved unit substation was also installed, consisting of a Schneider 1000kVA unit transformer utilised to provide the LV cut outs to the residential building.

Main supply and tram crossings

The point of connection for the main supply was an existing UKPN substation at Croydon Central. To provide the 16.4MVA capacity, three underground 11kV circuits were required. This involved trenching through highway, footpaths, and three tram crossings through central Croydon, using a technique called 'pipe jacking'.

For one tram crossing, we had to close an existing subway station and construct a steel piped box section through the subway.

The project has involved us working with main contractors and a wide range of professional teams including MEP consultants, architects and cost consultants. We are excited to continue with this major development and look forward to seeing Ruskin Square's vibrant new image.



ESM CONNECT - Sherford

The site

Sherford Primary

The project

To carry out the electrical design, installation and project management of the 33/11kV substation build at Sherford Primary. The project is to support the load for a new development here which will include:

• 5,550 high-quality new homes

• 84,000 square metres of commercial and retail area

• A wide range of community facilities

Our work

Work on this project consisted of many different elements including two new 33/11kV (12/18 MVA) transformers, 33kV switchgear, 11kV switchgear, protection panels, substation earthing and all other works associated with a new primary substation. We also acted as the main principal contractor with responsibility of managing the project in line with CDM regulations including planning, managing, and monitoring all risks on site. We worked with several contractors as well as our own and we ensured that all contractors followed our rigorous safety rules and were aware of all risks. This stringent approach contributed to the success of the project without any reported injuries or accidents.

This site itself was a particular challenge because of the access down a narrow lane. This proved difficult when delivering the transformers and switchgear but ESM Power overcame these obstacles to complete the project in time.

The new primary substation has a shared building with dedicated rooms and contains equipment owned and operated by Western Power Distribution (WPD) and GTC as the IDNO.



ESM CONNECT - Thirty Acres

Enerparc is a global expert in large-scale photovoltaic (PV) systems. They deliver reliable and economical solar power to a variety of customers.

The site

The Thirty Acres Solar Farm site delivers 3MW of power.

Our work

ESM Power Ltd commenced design work in November 2015 with construction on site beginning in February 2016.

Construction was completed a month later in time for the March solar tariff deadlines. This was within an extremely tight deadline, our work included the design, procurement and construction of a 3MW supply to the new solar farm from an 11kV point of connection on Western Power Distribution (WPD) network.

The site required an innovative approach, crossing an old bridge structure in order to utilise steel ducts to protect the cables due to shallow depth.
Our main work included:

• A detailed civil design to WPD specifications for the 11kV metered substation

• Supply and installation of the dual customer/DNO substation GRP building and associated earthing

• Supply and installation of 11kV metered RMU for the substation and metering equipment

• Manage the adoption agreement

• Full commissioning including G59



ESM CONNECT - West Raynham

The site

The 225-acre site at West Raynham is a former RAF station and was chosen due to its reputation as being one of the sunniest places in the UK. The farm aims to power more than 14,000 homes for the next 25 years and ESM Power was chosen as the principal contractor, beginning the first phase of connection in September 2014.

Our work

In a six-month period from September 2014 to March 2015 we completed both the physical build of the 132kV/33kV substation and the 9km 33kV cable route to the solar farm.

ESM Power designed, procured, installed and commissioned the high voltage infrastructure to the solar farm. We managed the 132kV point of connection (POC) interface on behalf of the client with UK Power Networks. As the ICP, we also undertook the contestable element of the 132kV works to UKPN standards.

The site features around 200,000 solar panels producing 49.9MW.



ESM DESIGN - Follingsby

The Client

Legal & General UK Property Fund are a multinational financial services group. Their services include investment management, general insurance, life insurance, pensions and building services.

Our Work

The client requested ESM Power's services to assist with an upgrade of 7MVA to feed into new developments in Follingsby Business Park.

ESM Power are acting as principal designer and principal contractor for this project. The first stage was completed off site and included approximately 3km of cable route, the majority of which was alongside the A194 road.

The design stage of this project was a particular challenge. We encountered major obstacles such as roundabouts, high areas of congestion and railway bridges as well as restrictions from Highways Agency and Northern Powergrid. To complete the route and overcome these challenges, we used a number of complex directional drills. Several of these were the deepest and longest that Northern Powergrid have ever experienced and so obtaining design approval proved difficult. ESM Power's designs were based on both the IDNO and client requirements and we successfully obtained design approval from UKPD as the adopting asset owner for the network.

The second stage was on-site work. The majority of the route, approximately 2km, was carried out in the adoptable roads and footpaths. ESM Power have supplied and installed a number of ring main units, transformers and low voltage breakers to feed the units.

We have also carried out all of the civil works both on site and off site, including plinths and excavation work.

This project required all areas of our business to work together and communication was a contributing factor to successfully completing the initial stages. We provided all correspondence to the local council and Highways Agency, seeking all the required works notices and permissions. Also we dealt with all construction health and safety, acting as principal contractor and notification to HSE.



ESM DESIGN - Wood Wharf

A new residential led, waterside site is being developed in Wood Wharf. This major estate will have over 3,400 domestic plots, 20 high rise buildings and over 45MVA of commercial load.

Wood Wharf is one of central London's largest privately owned development sites covering 23 acres and is of major importance on a local, national and international level.

Our Work

ESM Power were successfully awarded the project after providing the Canary Wharf Contractor with confidence in our technical understanding as well as offering a competitive commercial contract.

This major project included five High Voltage (HV) supplies from Deptford Primary, Blackwall Way and Simpsons Road. We provided the customer with a diversified capacity of 51MVA.

The 11kV supply had to be cleverly integrated into newly established onsite 11kV switchgear panel boards to allow for a secure supply to the entire development.

Due to the nature of the project, there were many technical hurdles to address and resolve, including:

• Basement substations with long plant and indirect plant replacement routes

• Substation proximities to residential and commercial buildings

• Complex DNO and IDNO HV and LV routes, including bespoke chambers and shared access agreements

• Producing a design to assist with spreading the load across the main HV supplies while maintaining the level of security required

• Internal trades and utilities interface

• High rise LV distribution

• Over 20 HV integral substations 

To overcome some of these challenges, our expert design team delivered a personable design service including turnkey design solutions to suit the client, DNO and IDNO standards.

We also had the responsibility of appointing a suitable IDNO to adopt the LV network and parts of the HV network. ESM Power carried out extensive research and negotiations before appointing LEEP. Our approach to this task further maintained the client's confidence in our abilities to protect their interest whilst ensuring the adoptability of the scheme.

ESM Power managed site M&E contractors delivering the adoptable scheme. What's more, we put in place reasonable processes to ensure the sub-contractors are delivering to a high standard and meeting our high safety and quality standards as well as the client, DNO and IDNO expectations.

Our experience with installing complex HV and LV networks means we have also been appointed to deliver Block E (phase 1) including 2no HV substations and an extensive internal LV network.



ESM NETWORKS - EnviroEnergy

EnviroEnergy are one of the UK's longest established district heating companies. They manage energy production, supply and billing for both domestic and commercial properties across the city of Nottingham.

The site

Owned by Nottingham City Council, EnviroEnergy's London Heat Road Station supplies power to 4,700 homes and 100 businesses across Nottingham. This includes some of the city's biggest attractions such as the Victoria and Broadmarsh shopping centres and the National Ice Centre Arena as well as vital services at Nottingham Trent University and HM Revenue and Customs.

The work

The existing switchgear was approaching the end of it's useful operational life, oil filled and subject to numerous Suspensions of Operational Practices (SOPs). ESM Power replaced it with modern SF6 equivalent units.

This work provides the site and the services powered by this substation with long-term security of supplies. What's more, the site has now regained the flexibility of being able to switch local circuits safely without the inconvenience of switching upstream.

With careful planning ESM Power engineers worked through the night to minimise disruption to the ongoing site operations.



For more information on any of our services, quotations or general enquiries, contact ESM Power.