Notes on completion
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First Tier Pro-forma
Project title
Participant DNOs
Project summary
Please provide a narrative which explains the Problem(s) which being addressed by the Project.
Registration Date
SSET1008 - LV Network Connected Energy Storage
Scottish and Southern Energy Power Distribution
SEPD seek to understand the potential benefits, practicalities and costs of installing electrical energy storage
(ESS) connected via 4 quadrant power conversion systems (PCS) on the LV network. The main objective is to
inform and de-risk the larger scale deployment of street batteries as detailed in the NTVV Tier 2 project.
The ESS units with associated PCS have the potential to aid power quality, to manage reactive power flows and
to reduce the peak demand / peak generation real power flows, through peak lopping. This has the potential to
delay or reduce the need for traditional network reinforcement, thereby preventing the local DNO network from
becoming a barrier to the deployment of low carbon technologies. In order to understand the operation of an
ESS with relevant low carbon technologies such as solar PV and EVs, SEPD has identified a site with
established solar generation and electric vehicle charging points. SEPD is proposing to install 3 single phase 25
kW / 25 kWh lithium-ion batteries at this strategic location on the LV network.
SEPD will monitor, model and analyse the operation of the ESS to understand the technical solutions that this
technology can provide to the low voltage network. We will apply shadow cable limits and will not pose any risk
to the security of supply. The data and learning obtained will feed directly into the Tier 2 project to support the
large rollout of this technology.
As the uptake of the low carbon technologies identified in the Low Carbon Transition Plan increases (solar PV
and electric vehicles, etc) the likelihood is that this will cause power quality issues, and problems with voltage
and thermal constraints on LV feeder circuits. The present capital intensive solution causes significant disruption
to customers, requires full excavation and has long lead times.
There are currently a small number of sites in the distribution area owned by SEPD that are beginning to exhibit
the problems discussed. In the SEPD area to date, there are over 12,000 solar PV installations registered under
the Feed In Tariff - as the number increases the likelihood is that LV network issues will become more
widespread and require network upgrades. This project is the first of two stages exploring the use of batteries
and 4 quadrant PCS units to address these problems.
Scope and Objectives
Please describe the scope and objectives of the Project should be clearly defined including the benefits which should directly
accrue to the Distribution System.
Success Criteria
Please give details of how the DNO will evaluate whether the Project has been successful.
This section should set out the Method or Methods that will be trialled in order to solve the Problem. The type of Method
should be identified where possible e.g. technical or commercial.
Problem(s) continued
ESS units with PCS on the LV network could manage power quality and reduce the peak demand / generation
to keep the cable within thermal limits. The units can also aid voltage regulation to remain within supply
guidelines. SEPD wishes to:
Understand and verify the technical benefits of ESS with reactive power capabilities on the LV network.
Generate knowledge of the practicalities of locating and operating ESS at street level, to inform NTVV delivery.
Inform future procurement exercises which will be part of NTVV
Demonstrate and learn from the control and operation of batteries on an LV system only.
De-risk future Street level ESS installations.
SITE IDENTIFICATION - the devices will be installed in conjunction with the SSE corporate project 'Zero
Carbon Homes'. The homes provide an excellent foundation to trial the batteries as there is a multitude of low
carbon technologies including 65kW solar array, heat pumps and electric vehicles. A suitable location close to
the homes has been agreed with SSE property dept.
OPERATION SPECIFICATION STAGE - Collaborative learning with emergency services, HSE etc. with regard
to the safe operation of these units
SITE PREPERATION WORKS - associated civil works for the battery installation and communications
infrastructure at the local substation.
COMMISSIONING PHASE - The units will begin with a basic charge / discharge profile to prove the units
operate as expected and is in line with G59 regulations and communications are functioning. This will then
advance to a thermal setpoint profile e.g. as the cable becomes 80% loaded the battery will charge and
discharge below this value. The final implementation will include autonomous voltage support using re-active
OUTPUT VALIDATION - SEPD will put the units through a rigorous test programme, the data from this will be
analysed to validate the trial. This will help to inform the larger rollout of the technology proposed under the New
Thames Valley Vision project.
Prove the batteries and power conversion units can operate as intended on an LV network in the UK and have a
tangible benefit electrically. Inform the establishment of the economic threshold for this technology.
Validate the technical specification to inform and de-risk the tendering exercise for the Tier 2 project
Define, test and prove the communications and the associated data transfer requirements for this small trial and
inform that required for a larger array.
Inform the safety case and the operational procedures including installation, maintenance and operational work
on a network with storage connected (faults, protection. live working, safety procedures etc.)
Inform decisions regarding the physical location of storage devices given public perception and acceptance.
Complete the G59 commissioning and functionality testing of the ESS units to pave the way for the large array
planned under the NTVV project.
Prove the ESS devices can successfully support voltage using the 4 quadrant power converter.
Use the ESS charge / discharge setpoints to peak lop both demand and generation.
Confirm communications and remote control of the devices from ENMAC
The DNO should highlight any material, known risks that could impact the Project’s costs and/or programmes.
Scale of project
Please justify the scale of the Project. In particular, the DNO should explain why there would be less potential for new learning
if the Project were a smaller scale.
Geographical area
Details of where the Trial(s) will take place. If the Project is a collaboration, the DNO area(a) in which the Trial(s) take place
should be identified.
Potential for new learning
Detail what the parties hope to learn and how the learning will be disseminated.
This should be between 5-8 to be eligible for Tier 1 Funds.
Predicted start and end dates.
DNOs should provide an estimate of the expected project starting and completion dates.
Start Date: End Date:
Project partners and external funders
Please give details of actual or potential Project Partners and External Funding Support as appropriate
S&C Electric will supply the battery units with associated control logic and communications
interface on a supplier basis.
EA Technology will be involved in documenting the safety procedures and executing the test
Learning from the project is to feed directly into the NTVV rollout:
1. Procedures for installing and operating LV-connected energy storage
2. Quantitative measures of the benefits of LV-connected energy storage for network operators in
terms of power quality management, peak lopping and/or voltage support
3. Initial assessment of economic viability of LV-connected energy storage compared to traditional
asset replacement programmes
The supply and delivery of the battery units is delayed.
A significant safety issue is identified with the specification of the ESS units.
A significant safety issue is identified during the development of the safety procedures.
The communications do not function as specified.
Cyber security risks are not sufficiently mitigated.
Installation problems are experienced with the civil elements of the project.
Risk of damage to the equipment.
Site security issues.
The intention is to conduct a small trial of 3 single phase units to prove the technical functionality
and that energy storage provides a benefit to the LV network, before commencing a larger rollout
as part of our Tier 2 project. NTVV will take the learning from this project and build on it to
evaluate the solutions across a range of network topographies and demand profiles. In addition
NTVV will subsequently demonstrate the clustered operation of multiple units to gain aggregated
benefits at higher voltage levels of the network.
SEPD consider that the project could not be any smaller to deliver meaningful learning at this
The project will be located within the territory of SEPD in Slough, Berkshire, UK.
Please tick if the project conforms to the default IPR arrangements set out in
the LCN Fund Governance Document?
The DNO should indicate if the Project does not conform to the default IPR conditions. A justification for alternative arrangements and why the Project
should still be approved must be provided, in accordance with paragraph 2.18 of the Governance Document.
Please tick if you do not consent to the First tier pro-forma being published in
If you do not consent please identify any information in the completed First Tier LCN
Project Registration that you do not wish to be published.
The DNO must demonstrate that it (or its Project Partners) will face commercial harm from its disclosure and that
information is considered eligible for exemption under the Freedom of Information Act 2000 or the Environmental
Information Regulations 2004.
All information submitted within the First Tier LCN Project Registration Pro-forma will be made available on the Ofgem
website, unless Ofgem has agreed otherwise as part of the Registration process set out above.
Estimated Project funding
An indication of the revenue allowed for within the DPCR5
settlement that is likely to be saved as a result of the project.
An indication of the total Allowable First Tier Project
Expenditure that the DNO expects to reclaim the for the
whole project.
Revenue allowed for in
the DPCR5 Settlement (£)
Indicative total Allowable
First Tier Project
Expenditure (£)
Please tick if the project involves making payments to related undertakings
The DNO must set out all payments that it proposes to make to itself or any Related Undertaking. Further, if a payment is to
be made to any Related Undertaking that is a Distribution System User, the DNO must demonstrate that it has offered the
same terms to similar Distribution System Users on the part of the network that is within the Project boundary and has used
reasonable endeavours to identify such Users.
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