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1 | Appendix G |
| Appendix G data provides Northern Powergrid’s contracted position with National Grid for Relevant Embedded Power Stations connected and to be connected to the Distribution System. |
2 | Constraint |
| A limitation or restriction on network operation. This can result from physical limitations of infrastructure, safety considerations, or regulatory requirements. An example would be the maximum load capacity of a transformer. These can be managed through upgrading infrastructure, or with flexibility. |
3 | Constraint Management Zone | CMZ | The geographic region in which a constraint exists, usually identified by a substation name. |
4 | Digitalisation Strategy and Action Plan | DSAP | Sets out how Northern Powergrid use technology and data to improve customer service, business resilience and business efficiency to meet the needs of our customers and other stakeholders. |
5 | Distributed Energy Resources | DER | Flexible generation or demand connected to the distribution system. |
6 | Distribution Network Operator | DNO | A company responsible for operating, maintaining and developing the electrical distribution network within a specific geographic region. Delivering electricity from the transmission system to industrial, commercial and domestic properties. |
7 | Distribution Network Options Assessment | DNOA | A process for assessing options for reinforcing the distribution network to meet the requirements set out in the DFES report. The bi-annual DNOAN report presents Northern Powergrid’s short term plans for the use of flexibility and conventional reinforcement to manage network capacity. |
8 | Fault Level |
| Maximum electrical current that can flow through a system during a fault condition. |
9 | Firm Capacity |
| The amount of electric power that a generation facility or an energy system can produce and deliver to the grid under all conditions. |
10 | Flexibility Service Provider | FSP | A Customer or an Aggregator (acting on behalf of customer) who contract with Northern Powergrid to provide Flexibility Services |
11 | Half Hourly meters | HH | A half-hourly meter, equipped with a communication device, allows a data collector to remotely obtain half-hourly consumption data from the electricity meter |
12 | Headroom |
| Refers to the amount of unused capacity which is available in a power network area before it reaches it's Firm Capacity |
13 | High Voltage | HV | A distribution voltage, operating at voltages higher than 1000V, but lower than 25kV. |
14 | Local Area Energy Plan | LAEP | A detailed plan which is the product of a process involving range of stakeholders, including local authorities and gas and electricity network operators, agreeing on the optimal long-term energy solution for an area. |
15 | Long Term Development Statement | LTDS | A published and accessible regulated data submission from a DNO that contains network information which can be used by the DNO or stakeholders when assessing the feasibility of connections to the Northern Powergrid distribution network. |
16 | Low Carbon Technology | LCT | Technologies that emit low levels of carbon dioxide emissions or enable low carbon technologies to operate e.g. Electric Vehicle Charge Points, Heat Pumps, etc. |
17 | North East | NE | NE represents our North East Licence Area and relates geographically to the North East of England, Teesside and some of the north of Yorkshire |
18 | Network Development Report | NDR | The report that details our NDP and includes Northern Powergrid's plans for interventions, flexibility services requirements and forecast demand and generation headroom across our network. |
19 | Non-contestable |
| Connection works that can only be carried out by Northern Powergrid for the safety and security of the distribution network |
20 | Northern Powergrid | NPg | Northern Powergrid own and manage the electricity network that serves more than 8 million people across 4 million homes and businesses in the North East, Yorkshire and northern Lincolnshire |
21 | Open-cycle gas turbines | OCGT | The simplest application of gas combustion for power/electricity generation. As the heat from the process is not utilised they are not a very efficient way to produce electricity. |
22 | Peak Demand |
| This is the point of maximum electricity demand on either a particular asset such as a substation or can also be a value for the whole system |
23 | Primary Substation | PS | A substation in which EHV distribution voltages (66/33kV) are stepped down to high voltage (20/11kV) levels, for local distribution. |
24 | Reinforcement |
| In areas of constraint, we may need to additional equipment on our network to create capacity for new connections. We call this network reinforcement. |
25 | RIIO - ED2 price control period | ED2 | Revenue = Incentive + Innovation + Output / ED = Electricity Distribution. This is the second performance based regulatory model created by the UK's office of Gas and Electricity Markets (Ofgem), designed to encourage network companies to put stakeholders at the heart of decision-making, innovating and delivering a low-carbon energy system, all while investing efficiently to deliver value for customers. RIIO ED2 covers the 5 year period, 01/04/23 - 31/04/28 |
26 | Smart Local Energy Systems | SLES | These systems connect local energy generation, storage, demand, and infrastructure in a smart, interconnected and managed way |
27 | Smart Optimisation output | SOO | Smart Optimization output is a license obligation to improve collaboration with local stakeholders by making network and development data more accessible, transparent, and interoperable. |
28 | Statutory Limits |
| The maximum voltage deviation allowed, above and below the nominal voltage. This value of allowed deviation is dependent on the voltage level. |
29 | Strategic Innovation fund | SIF | An Ofgem programme that funds projects that could speed the transition to net zero at the lowest cost to the consumer as part of the RIIO-2 price controls. |
30 | Active Network Management | ANM | A control system that manages generation and load in real-time to keep the system within parameters. |
31 | Advanced Distribution Management System | ADMS | The control of network assets which is achieved through a set of capabilities collectively referred to as ADMS, which monitor and control network assets such as voltage control devices, circuit breakers and switches. |
32 | Alternating Current | AC | An electric current that reverses direction at regular intervals to produce a cycle, where the number of cycles per second determines the AC frequency. In the UK, AC frequency is 50Hz. |
33 | Bulk Supply Point | BSP | A substation at which 132kV distribution voltages are stepped down to a primary level (66/33kV/11kV) for distribution at a more local level. |
34 | Capacity |
| The maximum amount of power that can be distributed through an asset or the network as a whole. |
35 | Closed-cycle gas turbine | CCGT | Closed-cycle gas turbines. A common type of large scale natural-gas-fired power plant. |
36 | Computer Information Systems | CIS | Computer Information Systems. This is a broad term used to describe the management the communications between hardware and software on data storage and data management equipment. |
37 | Common Information Model | CIM | An open, international standard that defines how managed elements in an IT environment are represented as a common set of objects and relationships between them. |
38 | Contestable |
| Connection works that can be carried out by Northern Powergrid or by an accredited Independent Connections Provider |
39 | Current Transformer metering | CT | CT stands for current transformer, used for metering currents of 100 amps or more. |
40 | Distribution Connection and Use of System Agreement | DCUSA | Distribution Connection and Use of System Agreement. A multi-party contract between the licensed electricity Distributors, Suppliers and Generators of Great Britain. |
41 | Decentralised System |
| A decentralised system where small-scale energy units supply local customers. Customers use renewable energy when available, EVs and community storage charge at favourable rates based on real-time data. Users adjust demand, facilitated by the network. |
42 | Distributed Energy Resources Management Systems | DERMS | The control of customer assets including DER's is achieve through a set of capabilities referred to as distributed energy resource management systems. DERMS enables optimised and proactive network management and stretches from panning to operations for the management and control of customer assets. |
43 | Distributed Future Energy Scenarios | DFES | A detailed report that outlines the range of credible futures for growth of the distribution network. DFES uses a load model to generate projections for future load (GW) and consumption (GWh) on the network due to changes in building sector and uptake of low carbon technologies. |
44 | Electricity System Operator | ESO | The entity responsible for operating the GB energy system. They have many roles including insuring adequate planning for UK's future energy needs (including for electricity and gas) and for managing the connection contracts with those who want to connect to and/or use the electricity transmission system. National ESO (NESO) is the GB energy system operator. |
45 | Energy Network Association | ENA | The industry body funded by UK electricity transmission and distribution licence holders. It's their role to provide a strategic focus for the energy networks sector by communicating key messages. The also co-ordinate a range of the industry codes/processes such as the G83 and G99 connection processes. |
46 | Expression of interest | EOI | A statement by a company or customer of their intention to take part in an opportunity |
47 | Flexibility Services |
| A contract between Northern Powergrid and a Flexibility Service Providers (FSPs) who can increase or decrease their energy consumption and/or generation at times requested by us in exchange for payment. |
48 | G98 | G98 | Engineering Recommendation G98, a standard in the UK that outlines the technical requirements for the connection of small-scale embedded generators (up to 16A per phase) to distribution networks. |
49 | G99 | G99 | Engineering recommendation G99 replaced engineering recommendation G59 and details the requirements for generation equipment (over 16A per phase) connecting to distribution networks. |
50 | Generation |
| In the context of electricity it is the process of producing electrical power from various energy sources such as but not limited to wind, solar, fossil fuel. |
51 | Gigawatt | GW | A unit of electrical power equal to one billion watts |
52 | Gigawatt-Hour | GWh | A unit of electrical energy equal to one billion watt hours |
53 | Half Hourly Data | HHD | Data from a half-hourly meter can be turned into data record e.g. a spreadsheet for users to view their half-hour data over a year. |
54 | Independent Connections Providers | ICP | Able to carry out the design and installation works. The works can be done by a wide range of qualified companies and are referred to as ‘contestable’ works. |
55 | Network Headroom Report | NHR | A report that assesses the available capacity in an electrical power network to accommodate additional load or generation without compromising stability or performance. |
56 | National Energy System Operator | NESO | The independent energy system planner and operator responsible for the plans, markets and operations of the energy system of today and the future. They take a whole systems approach across natural gas, electricity and other forms of energy e.g. storage. |
57 | Non Half Hourly Meters | NHH | This is an analogue meter that does not have an ability to share it's data remotely therefore requires someone to attend site in person to obtain readings. |
58 | Overhead Lines | OHL | Overhead lines are our electricity distribution conductors above ground, supported by poles. |
59 | Photovoltaic | PV | The technology and process of converting sunlight directly into electricity using certain semiconductor materials. PV materials are encapsulated in solar panels and combined with an inverter to generate renewable electricity that can be used in where it is generated e.g. in homes or exported into the network for distribution and use elsewhere. |
60 | Smart Metering |
| Uses digital meters to monitor and manage energy usage, enabling real-time data collection and remote management. |
61 | Transformer | Tx | A static electrical power device that "steps up" or "steps down" voltage to a predetermined level |
62 | Yorkshire | YK | YK represents our Yorkshire Licence Area and relates geographically to most of Yorkshire and the north of Lincolnshire |
63 | Air Source Heat Pump | ASHP | A energy efficient heating and cooling system that transfers heat between the indoor and outdoor space to heat properties. It is usually fuelled by electricity. |
64 | Application Programming Interface | API | Application Programming Interface. An API is a set of rules and protocols that allows different software applications to communicate with each other and is a common tool for data exchange between different software systems - especially between different organisations. |
65 | Connections Business Development |
| Connections Business Development |
66 | Centralised system |
| A centralized system features one-way power flow from (mainly large fossil fuel) generators to homes and businesses, with generation meeting peak demand. This was the traditional model for the Electricity System in the UK. |
67 | Circuit Breaker | CB | A circuit breaker is a safety device that protects the network from high current surges that could damage sensitive equipment. |
68 | Curtailment |
| Taking action to reduce the amount of electricity output from generators or electricity demand from consumers in order to maintain a balance between energy supply and demand or to manage network constraints safety. |
69 | Demand |
| The immediate rate at which energy is consumed. It represents the maximum amount of power required at any given point. |
70 | Direct Current | DC | A one-directional flow of electricity mainly used in small devices such as computers. Can be used at very high voltages to interconnect different electricity systems e.g. between one country and another. |
71 | Distribution Load Estimates | DLE | A report outlining the net maximum demand for the past year at each grid supply point (GSP), supply point, and primary substation, along with an eight-year demand forecast considering forecasted growth rates and new (accepted) demand and generation connection schemes into our network. |
72 | Distribution Substation | DSS | A substation in which HV distribution voltages (20/11kV) are stepped down to low voltage (400/230v) levels for supply to individual properties, streets, estates, etc. |
73 | Distribution System Operator | DSO | The functions within Northern Powergrid that are focused on planning, developing and operating our system to provide the capacity to enable the uptake of low carbon technologies and the transistion to net zero. |
74 | Electric vehicle | EV | A type of car that is fuelled by electricity rather than petrol or diesel. EV's use on-board batteries to store the electricity. As EVs become more popular, demand on the electricity network will increase due to plugging in to the network to recharging their batteries. |
75 | Electrical Vehicle Charging Point | EVCP | An electricity charging device used as a power supply for plug-in electric vehicles. |
76 | Embedded Capacity Register | ECR | Contains information on both connected and accepted, generation and storage sites with a capacity of ≥ 50kW. |
77 | Extra High Voltage | EHV | A distribution voltage operating at levels higher than 25kV. Typical EHV levels for Northern Powergrid are 132kV, 66kV and 33kV. |
78 | G59 | G59 | Engineering recommendation G59 was the historical regulation surrounding the connection of any form of generator device to run ‘in parallel’ or ‘synchronised’ with the grid. Superseded by the ER G99. |
79 | Grid Supply Point | GSP | A substation at which transmission voltages (400/275 kV) from National Grid are stepped down to distribution voltages (132/66/33 kV) for utilisation by the Distribution Network Operator |
80 | Ground Source Heat Pump | GSHP | An energy efficient heating and cooling system that extracts and transfers heat from the ground to heat properties. These are often fuelled by electricity. |