Demand Control Field Trials Overview of proposed field trials 16th March 2016

Contents Meeting aims and objectives Trials aims and objectives Trial design structure Trial design considerations

Meeting aims and objectives To provide an overview of the proposed trial Allow the opportunity for questions and discussion Objectives Secure agreement from DNOs to participate in the trials Agree timescales for implementation

Trial aims and objectives To comprehensively understand the effectiveness of Voltage Reduction in distribution networks for the purposes of reducing load on the network Effectiveness metrics: (i) How much demand reduction can be achieved? and (ii) How long does it take to be delivered? Objectives: Evaluate the effectiveness of Voltage Reduction in Demand Control Focussing on the magnitude and duration of benefits Quantify and assess the relationship between distributed generation and Voltage Reduction through local real-world field trials Evaluate the effectiveness of procedures for the implementation of Voltage Reduction Develop best practice guidelines and training procedures to streamline NGET and DNO practical processes for the implementation and management of Demand Control events Investigate the potential impacts Demand Control events may have on electricity customers

Trials Design Structure

Regional trials Objectives Approach Evaluate magnitude and timescale of achievable demand reduction Determine variability of response due to time-of-year, time-of-week and time-of-day Approach Identify suitable trial networks with primary substations dominated by: Domestic load Industrial & commercial load Industrial, commercial and domestic load High proportion of generation Deploy high resolution monitoring equipment at substations Initiate ‘Voltage Reduction Stage 1’ Monitor demand response for comparison against models

Regional trials

Local trials Objectives Approach Confirm response of electricity demand and distributed generation to variations in the distribution system voltage Support validation and enhancement of the composite demand model Approach Identify potential trial networks with a mixture of load and generation types where the mixture is known or can be confidently estimated Initiate voltage reduction Monitor demand response for comparison against models

Local trials

Trial considerations

Site selection summary Trial Description Site Regional Voltage–Demand Model Verification Primary Substations with common Bulk Supply Point with following load types in various geographies (DNO license areas): Predominantly domestic/residential; Predominantly commercial/retail; and Predominantly industrial. Voltage–Generation Primary Substations or Feeders with the following generation types in various geographies: Predominantly renewable generation (with known load mix) – e.g. Rural wind/solar; Predominantly generation (with known load profile) – e.g. Urban CHP and Waste to Energy; and High Proportion of generation in Voltage control mode (PV). Local Demand Response Delivery Timescales Several DNOs enacting Voltage reduction in several GSP groups upon notification by NGET: Common monitoring between GSP, BSP and Primary sites for comparative analysis. National Demand Response from Voltage Reduction verification

Proposed test schedule – regional trials Time-of-year Time-of-week Time-of-day Number of tests Spring (27th March – 6th May) Tuesday and Sunday 03:00 – 05:00 1 06:00 – 10:00 13:00 – 15:00 16:00 – 20:00 Summer (7th May – 4th September) Autumn (4th September – 29th October) Winter (30th October – 26th March)

Proposed test schedule – local trials Trial type Time-of-year Time-of-week Time-of-day Network type Number of tests Load Spring (27th March – 6th May) Tuesday and Sunday 03:00 – 05:00 1 – 4 2 06:00 – 10:00 3 13:00 – 15:00 16:00 – 20:00 Summer (7th May – 4th September) Autumn (4th September – 29th October) Winter (30th October – 26th March) Distributed generation N/A Generating periods 5 6 Non generating periods 7 8 9

Requested DNO involvement

Sought after DNO involvement Provide comments on the proposed methodology Recommend areas for trial focus Known areas for potential benefits or issues from previous trials Subscribe to overall plan and broad timescales Agree to installation of temporary monitoring equipment in identified substations Commit to short-term trial targets and deadlines If not already covered by this point in the discussion, cover the benefits identified by the CASS project and the desire to run a sub-set of trials to determine the benefits and impacts this could have on implementation of voltage reduction and maintaining safety limits.

Tim Butler timothy.butler@eatechnology.com