This useful acronym expander is a list of commonly abbreviated terms used across the renewable energy sector, with their full meanings. This resource aims to help users’ understanding, and can act as a ‘cheat sheet’ when engaging with resources.
Experience Level:
Foundation
Provided by: Greater South East Net Zero Hub
This useful acronym expander is a list of commonly abbreviated terms used across the renewable energy sector, with their full meanings. This resource aims to help users’ understanding, and can act as a ‘cheat sheet’ when engaging with resources.
| wdt_ID | wdt_created_by | wdt_created_at | wdt_last_edited_by | wdt_last_edited_at | Acronym | Term | Description | Link |
|---|---|---|---|---|---|---|---|---|
| 151 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | °C | Degrees Celsius | The standard unit of temperature measurement. Global average temperature has risen by approximately 1.2°C since pre-industrial times. | |
| 152 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | ACH | Air Changes per Hour | A measure of how many times the entire volume of air in a building is replaced in one hour, used to assess airtightness and ventilation rates. | |
| 153 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | AD | Anaerobic Digestion | A biological process breaking down organic material to produce biogas and digestate that can be used for renewable energy production. | |
| 154 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | AHU | Air Handling Unit | A large piece of HVAC equipment that conditions and circulates air as part of a building's mechanical ventilation system. | |
| 155 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | AMR | Automatic Meter Reading | Technology that automatically collects consumption data from energy meters and transfers it to a central database, replacing manual meter reads. | |
| 156 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | ASHP | Air Source Heat Pump | Low-carbon heating system that absorbs heat from the outdoor air and transfers it into a building through a refrigerant cycle. | |
| 157 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | BEMS / BMS | Building Energy Management System / Building Management System | A technology solution that collects, monitors, and analyses a building’s energy use in real time. It connects to systems like HVAC, lighting, water, and power infrastructure to optimise performance and reduce waste. | |
| 158 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | BEO | Building Energy Optimisation | The process of improving a building’s in‑use energy performance through controls, monitoring, analytics and operational improvements to reduce energy consumption and emissions. | |
| 159 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | BESS | Battery Energy Storage System | A system that stores electrical energy in batteries for later use, helping to balance supply and demand on the grid and integrate variable renewable energy sources. | |
| 160 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | BEV | Battery Electric Vehicle | A fully electric vehicle powered by an on-board battery. | |
| 161 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | BIM | Building Information Modelling | A digital process for creating and managing information about a building project throughout its lifecycle. Used in low-carbon design and retrofit. | |
| 162 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | BIPV | Building-Integrated Photo Voltaics | Photovoltaic technologies integrated into building fabric (e.g. roofs, façades or glazing) that generate electricity while acting as construction materials. | |
| 163 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | BREEAM | Building Research Establishment Environmental Assessment Method | The leading sustainability assessment method for buildings - it evaluates environmental, social, and economic performance across a wide range of criteria. | |
| 164 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | BSI | British Standards Institution | UK's national standards body. | |
| 165 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | BTM | Behind-the-meter | Refers to energy generation or storage systems located on a customer's side of the utility meter, such as rooftop solar panels, battery storage, or EV chargers. These systems provide on-site power, allowing users to reduce energy costs, manage consumption, and increase independence from the main grid. | |
| 166 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | BUS | Boiler Upgrade Scheme | A Government grant scheme providing financial support to help property owners replace fossil fuel boilers with low-carbon alternatives. | |
| 167 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CAPEX | Capital Expenditure | The one-time, upfront cost of purchasing major assets like equipment, buildings, or hardware. | |
| 168 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CBA | Cost Benefit Analysis | A process used to determine if an investment is worthwhile by weighing the total costs against the expected gains. | |
| 169 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CCC | Climate Change Committee | An independent statutory body established under the Climate Change Act 2008 that advises the UK and devolved governments on reducing emissions and adapting to the impacts of climate change, emissions targets and climate progress. | |
| 170 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CCGT | Combined Cycle Gas Turbine | A highly efficient electricity generation technology that combines gas-fired turbines and steam turbines in one plant. | |
| 171 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CCR | Concessions Contracts Regulations | UK procurement regulations governing concession contracts where the supplier is granted the right to operate the asset or service and assumes significant operating risk, often used in infrastructure projects. | |
| 172 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CEE | Community Energy England | The national voice of the community energy sector, representing organisations from across the community, public, and private sectors all working to put people at the heart of energy system transformation. | |
| 173 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CEF | Community Energy Fund | A government-backed initiative designed to help local communities develop renewable energy and energy efficiency projects, it was delivered by the regional Hubs. It supports feasibility studies, project development, and implementation of initiatives such as small-scale wind farms, rooftop solar, battery storage, rural heat networks, electric vehicle charging points, and fuel poverty alleviation schemes. The fund aims to empower local people, generate clean energy, create jobs, and reinvest benefits into the community. | |
| 174 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CEG | Community Energy Group | Organisations that promote renewable energy, energy efficiency, and equitable access to clean energy at the local level. They can also be referred to Community Energy organisations. | |
| 175 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CEL | Community Energy London | A membership organisation that advocates for London’s community energy sector, providing advice, funding support, and capacity‑building for local, community‑led energy projects. | |
| 176 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CEP | Community Energy Pathways | A support organisation, primarily operating within the South East region. Their focus is on enabling local people and local authorities to scale up the community energy sector. | |
| 177 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CfD | Contract for Difference | The government's primary mechanism for supporting large-scale, low-carbon electricity generation. It incentivises investment in renewable energy by providing developers of projects with high upfront costs and long lifetimes with direct protection from volatile wholesale prices, and they protect consumers from paying increased support costs when electricity prices are high. | |
| 178 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CH4 | Methane | A potent greenhouse gas with much higher warming impact than CO₂, but over a shorter timescale. Main sources include natural gas leaks, livestock, and landfills. | |
| 179 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CHP | Combined Heat and Power | A system that generates electricity and captures usable heat from the same fuel source, achieving higher efficiency than separate generation. | |
| 180 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CM | Capacity Market | A legislative mechanism designed to ensure that there is sufficient generation capacity available to the system to maintain supply. | |
| 181 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CO₂ | Carbon Dioxide | The primary greenhouse gas emitted through human activities, mainly from burning fossil fuels. Used as the reference gas for measuring the global warming impact of other GHGs. | |
| 182 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CO₂e | Carbon Dioxide Equivalent | A unit that expresses the impact of different greenhouse gases in terms of the equivalent amount of CO₂ that would cause the same warming, allowing comparison across gases. | |
| 183 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CoP | Coefficient of Performance | A measure of energy efficiency of heating and cooling systems, calculated as the useful heating or cooling output divided by the energy input. It reflects performance at a single operating point. | |
| 184 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CP30/CP2030 | Clean Power 2030 Action Plan | A government action plan outlining how the UK intends to decarbonise the electricity system and deliver clean power by 2030. | |
| 185 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | CWI | Cavity Wall Insulation | The insulation material that is installed into the cavity of a building, which is the space between the inner and outer wall. | |
| 186 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | DAR | Delivery Assurance Review | A review process to ensure a project is being delivered according to the agreed standards and timelines. | |
| 187 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | DEC | Display Energy Certificate | A legal document that shows the actual, operational energy efficiency of a public building, rated on a scale from A to G (A being most efficient, G least). | |
| 188 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | DESNZ | Department for Energy Security and Net Zero | Government department responsible for energy policy, energy security and delivery of the UK’s Net Zero targets (formerly Department for Business, Energy and Industrial Strategy). | |
| 189 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | DFES | Distribution Future Energy Scenarios | A key part of a Distribution System Operator’s annual strategic planning process, forecasting future electricity demand and generation across the distribution network using four common national scenarios to 2050. | |
| 190 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | DH | District Heating | A communal heat supply system that distributes thermal energy from a central heat source to homes, public buildings, and businesses via a network of insulated pipes. | |
| 191 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | DHN | District Heating Network | A system of insulated underground pipes used to deliver heat generated centrally to multiple buildings within a neighbourhood or town, often supplied by waste heat, biomass, heat pumps, or combined heat and power. | |
| 192 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | DNO | Distribution Network Operator | A company licensed to distribute electricity in the UK. These companies own, operate and maintain the system of cables and towers that bring electricity to homes and businesses (distribution networks). | |
| 193 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | DSA | Data Sharing Agreement | A formal agreement defining how data is shared between organisations, including purpose, legal basis, responsibilities and security. | |
| 194 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | DSO | Distribution System Operator | An entity or operational model responsible for actively managing electricity distribution networks, integrating distributed energy resources, and balancing supply and demand in real time. | |
| 195 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | DSR | Demand Side Response | The ability of energy consumers to increase, reduce, or shift their electricity use in response to grid signals or price incentives, helping to balance supply and demand without relying on new generation capacity. | |
| 196 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | DUoS | Distribution Use of System charge | Fees paid by energy suppliers to Distribution Network Operators for building, operating and maintaining the distribution networks. | |
| 197 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | ECM | Energy Conservation Measures | Strategies, technologies, and practices designed to reduce energy consumption. | |
| 198 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | ECO | Energy Company Obligation | A government energy efficiency scheme designed to tackle fuel poverty and reduce carbon emissions by requiring medium and large suppliers to fund energy-saving improvements in low-income, fuel-poor and vulnerable households. The scheme had four iterations (ECO, ECO1, ECO2 and ECO3). | |
| 199 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | EHV | Extra High Voltage | Parts of the distribution network operating above 22 kV that are managed by Distribution Network Operators. | |
| 200 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | ENA | Energy Networks Association | A not-for-profit industry body representing the companies that own and operate Great Britain’s gas and electricity networks. | |
| 201 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | EPC | Energy Performance Certificate | A document measuring a building's energy efficiency, rating it from A (most efficient) to G (least efficient). Valid for 10 years, it is legally required in the UK when selling, renting, or constructing a property to inform buyers/tenants about running costs. | |
| 202 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | ESOS | Energy Savings Opportunity Scheme | A mandatory UK energy assessment scheme requiring large organisations to audit their energy consumption every four years and identify cost‑effective opportunities to improve energy efficiency. | |
| 203 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | EU ETS | EU Emissions Trading System | The European Union’s carbon market, which sets a cap on greenhouse gas emissions from participating sectors and allows trading of emissions allowances to drive cost‑effective decarbonisation. | |
| 204 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | EV | Electric Vehicle | Vehicles fuelled by electricity rather than fossil fuels, producing zero tailpipe emissions and significantly reducing noise emissions and fumes when charged with low-carbon electricity. | |
| 205 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | EWI | External Wall Insulation | A layer of insulation material to the outer walls, then covered with render or cladding. | |
| 206 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | F4F | Fit4Finance | A training or readiness program designed to ensure staff or projects meet financial compliance standards. | |
| 207 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | FFR | Firm/Fast Frequency Response | A grid balancing service under which contracted providers rapidly adjust generation or demand in response to changes in system frequency to help maintain electricity system stability. | |
| 208 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | FiT | Feed-in Tariff | A policy mechanism designed to encourage investment in renewable energy by paying owners of small-scale, low-carbon technologies for the electricity they generate and export to the national grid. | |
| 209 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | GBE | Great British Energy | A publicly owned energy company established to support investment in clean energy generation across the UK. | |
| 210 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | GBECF | Great British Energy Community Fund | A government programme which specifically funds community energy projects to do feasibility and development. It builds upon previous schemes such as Community Energy Fund and is administered by the regional Net Zero Hubs. | |
| 211 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | GDN | Gas Distribution Network | The system of pipelines, pressure regulators, and associated infrastructure that transports natural gas from the national transmission system to end users, including homes, businesses, and industrial sites. | |
| 212 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | GEMA | Gas and Electricity Markets Authority | The formal governing body and board of Ofgem, acting as the independent national regulatory authority for Great Britain's energy markets. | |
| 213 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | GHGs | Greenhouse gases | Gases that trap heat in the atmosphere, acting like a blanket around the planet. In a local authority context, this refers to emissions (such as carbon dioxide and methane) produced across council operations, housing, transport, and local services, which must be measured and reduced to meet climate targets and support community-wide action on climate change. | |
| 214 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | GHNF | Green Heat Network Fund | A government capital grant programme supporting the development and construction of low‑carbon heat networks. | |
| 215 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | GIS | Geographic Information System | A system used to capture, analyse and visualise spatial data, commonly applied to energy planning and infrastructure analysis. | |
| 216 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | GSHP | Ground Source Heat Pump | A heat pump system that extracts heat from the ground to provide low‑carbon heating and cooling. | |
| 217 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | GW | Gigawatt | A unit of power equal to one billion watts or 1,000 megawatts (MW). It is typically used to measure the capacity of large-scale power plants, or the total output of power systems. | |
| 218 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | GWh | Gigawatt-hour | A unit of energy equal to 1,000 megawatt-hours (MWh). | |
| 219 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | GWP | Global Warming Potential | A measure of how much heat a greenhouse gas traps in the atmosphere relative to carbon dioxide, calculated over a specified time horizon (commonly 20 or 100 years). | |
| 220 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | H₂ | Hydrogen | A chemical element that produces water when used in a fuel cell and no direct CO2 emissions at the point of use. Its overall carbon footprint depends on how it is produced, for example green (renewables), blue (fossil fuels with CCS), or grey (fossil fuels without CCS). | |
| 221 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | HH | Half-hourly | Electricity or gas metering arrangements that are subject to a mandatory requirement to transmit half-hourly consumption data to the supplier. | |
| 222 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | HHM | Half-hourly Meter | An electricity meter that records consumption in 30‑minute intervals, enabling detailed energy analysis. | |
| 223 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | HHS | Half-hourly settlement | An electricity industry process where suppliers use smart meter data to calculate energy usage and billing in 30-minutes intervals, rather than relying on estimates. | |
| 224 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | HIU | Heat Interface Unit | A device installed within an individual home or apartment connected to a district heating network, transferring heat from the network to the property’s space heating and hot water systems. | |
| 225 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | HNDU | Heat Network Delivery Unit | A government‑funded unit providing technical and commercial support for heat network development. | |
| 226 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | HNES | Heat Network Efficiency Scheme | A funding scheme supporting efficiency improvements to existing heat networks. | |
| 227 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | HUG | Home Upgrade Grant | A government initiative providing funding to local authorities in England to improve energy efficiency of low-income, off-gas-grid homes with poor Energy Performance Certificate ratings. | |
| 228 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | HVAC | Heating, Ventilation and Air Conditioning | Building systems that provide space heating, cooling, air quality and climate control. | |
| 229 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | HVO | Hydrotreated Vegetable Oil | A low‑carbon liquid fuel produced from waste fats and vegetable oils, which can be used as a substitute for heating oil (kerosene) in compatible systems, often with minimal equipment modification. | |
| 230 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | IDNO | Independent Distribution Network Operator | Small localised distribution network, typically for a campus, housing development, commercial or residential developments. | |
| 231 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | IRR | Internal Rate of Return | A financial metric used to assess the profitability of an investment based on projected cash flows. | |
| 232 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | ITT | Invitation to Tender | A formal document inviting suppliers to submit a proposal/bid for a specific project, goods or services. | |
| 233 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | Claire.Edgley@es.catapult.org.uk | 15/06/2026 04:00 PM | KVA | Kilo volt-amperes | A unit of apparent power in an electrical circuit where 1 kVA equals 1,000 volt-amperes. Apparent power represents the total capacity of an electrical system to deliver energy, regardless of whether the power is used for work or just circulating in the system. | |
| 234 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | kW | Kilowatt | A unit of power equivalent to 1,000 watts. Watts measure power at a given moment. | |
| 235 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | kWh | Kilowatt-hour | A unit of energy equivalent to one kilowatt of power used continuously for one hour. | |
| 236 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | kWp | Kilowatt peak | The maximum power output of a solar photovoltaic system under Standard Test Conditions. | |
| 237 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LA | Local Authority | An administrative, governing body responsible for delivering public services, governing local areas, and planning in a specific part of the UK. | |
| 238 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LAD | Local Authority Delivery | A government-funded scheme designed to upgrade the energy efficiency of homes for low-income and fuel-poor households. It provided funding to local councils to carry out installations. | |
| 239 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LAEP | Local Area Energy Plan | A place‑based plan describing how a local energy system can transition to Net Zero. | |
| 240 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LCOE | Levelised Cost of Energy | The average lifetime cost of generating one unit of electricity from an energy asset, including capital, fuel, and operating costs, typically expressed in £/MWh. | |
| 241 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LCSF | Low Carbon Skills Fund | Funding to support development of skills needed for the low‑carbon transition. | |
| 242 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LEAD | Local Energy Advice Demonstrators | A £20 million government programme testing innovative local, in‑person energy efficiency and clean‑heating advice in England, delivered through the Local Net Zero Hubs. | |
| 243 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LEZ | Low Emission Zone | A designated area where access is restricted or charges apply to the most polluting vehicles, primarily to improve local air quality by reducing nitrogen oxides and particulate matter. | |
| 244 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LIDP | Localised Industrial Decarbonisation Plans | Place‑based plans developed to identify pathways for reducing industrial carbon emissions within specific local or regional areas. The plans were funded through a competitively awarded government grant in 2023. | |
| 245 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LNG | Liquefied Natural Gas | Natural gas cooled to convert it into a liquid, enabling efficient storage and long‑distance transport where pipeline infrastructure is unavailable. | |
| 246 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LNZA | Local Net Zero Accelerator | Government‑backed programme supporting the development and delivery of local Net Zero projects by helping local authorities and partners bring projects to investment readiness. | |
| 247 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LPA | Local Planning Authority | The local body responsible for spatial planning and development control. | |
| 248 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LPG | Liquefied Petroleum Gas | A mixture of propane and butane stored as a liquid under pressure, commonly used for heating and cooking in off‑grid properties as an alternative to mains gas. | |
| 249 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | LV | Low Voltage | The lowest level of the distribution network, operating at voltages up to 1 kV, used to supply domestic and small commercial customers. | |
| 250 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | MCS | Microgeneration Certification Scheme | UK-based, independent quality assurance organisation that certifies small-scale renewable energy products and installers. | |
| 251 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | MHCLG | Ministry of Housing, Communities and Local Government | The UK government department responsible for housing policy, building regulations, and planning. | |
| 252 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | MVHR | Mechanical Ventilation with Heat Recovery | A whole‑building ventilation system that supplies fresh air while extracting stale air and recovering a high proportion of heat from the outgoing air to pre‑warm the incoming supply. | |
| 253 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | MW | Megawatt | A unit of power equivalent to 1,000 kilowatts (kW). | |
| 254 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | MWh | Megawatt hour | A unit of energy equal to 1,000 kilowatt-hours (kWh), representing electricity generated or consumed over time. | |
| 255 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | NESO | National Energy System Operator | An independent public body responsible for managing and planning the UK's electricity and gas networks. | |
| 256 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | NETS | National Electricity Transmission System | The high-voltage backbone of Great Britain's power network, comprising overhead lines, underground cables, and substations | |
| 257 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | NHH | Non-Half Hourly | Electricity or gas metering arrangements that are not subject to a mandatory requirement to transmit half-hourly consumption data to the supplier. | |
| 258 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | NPV | Net Present Value | A financial metric used to assess the profitability of an investment by calculating the difference between the present value of expected future cash inflows and outflows, discounted to today. | |
| 259 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | NWF | National Wealth Fund | A public investment institution supporting strategic national priorities, including Net Zero infrastructure. | |
| 260 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | NZG | Net Zero Go | A business support programme helping SMEs reduce emissions and progress towards Net Zero. | |
| 261 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | OCEJ | Office for Clean Energy Jobs | A government body coordinating workforce and skills development for the clean energy transition. | |
| 262 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | OCGT | Open Cycle Gas Turbine | A gas‑fired power plant that generates electricity without recovering waste heat, characterised by fast start‑up times and use mainly for peak demand or system balancing, but with lower efficiency than combined‑cycle plant. | |
| 263 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | Ofgem | Office of Gas and Electricity Markets | The independent national regulatory authority for Great Britain's electricity and natural gas markets. | |
| 264 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | OPEX | Operating Expenditure | The ongoing, day-to-day costs of running a project. | |
| 265 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | P2P | Peer-to-peer trading | A direct sale of electricity from a generator to a consumer, typically facilitated by digital platforms and often occurring at a local level. While it operates within existing regulatory frameworks, current market rules and network charging arrangements can make widespread implementation economically challenging. | |
| 266 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | PFI | Private Finance Initiative | A procurement method where private sector finance delivers public infrastructure. | |
| 267 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | PHEV | Plug-in Hybrid Electric Vehicle | A vehicle combining a rechargeable electric motor and battery with an internal combustion engine, allowing short electric‑only driving alongside conventional fuel use for longer journeys. | |
| 268 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | PPA | Power Purchase Agreement | A long‑term contract under which a buyer agrees to purchase electricity from a generator, typically setting out the price, volume, duration, and terms of supply. | |
| 269 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | ppm | Parts Per Million | A unit of concentration commonly used to express atmospheric greenhouse gas levels, such as carbon dioxide, whose concentration has increased from around 280 ppm pre‑industrial to over 420 ppm today. | |
| 270 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | PSD | Public Sector Decarbonisation | The process of reducing emissions from public sector buildings and operations. | |
| 271 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | PSDS | Public Sector Decarbonisation Scheme | A government grant scheme supporting low‑carbon heating and energy efficiency in public buildings. | |
| 272 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | PuFins | Public Finance Institutions | Government-backed bodies or banks that provide funding for public interest projects, like green energy. | |
| 273 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | PVT | Photovoltaic Thermal | A hybrid solar collector that simultaneously converts sunlight into electricity and heat within a single unit. | |
| 274 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | PWLB | Public Works Loan Board | A statutory body providing loans to local authorities for capital investment. | |
| 275 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | REGO | Renewable Energy Guarantee of Origin | A UK certificate issued for each megawatt‑hour of electricity generated from renewable sources, used by suppliers to evidence renewable electricity supply claims. | |
| 276 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | RESP | Regional Energy Strategic Plan | A high‑level strategy introduced by Ofgem outlining how regional energy systems will support Net Zero. | |
| 277 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | RIIO | Revenue = Innovation + Incentives + Outputs | A regulatory framework developed by Ofgem to set price controls for monopoly electricity and gas network companies in Great Britain. | |
| 278 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | RO | Renewables Obligation | The main scheme to incentivise large-scale renewable electricity generation by requiring suppliers to source a growing proportion of electricity from renewable sources. | |
| 279 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | ROC | Renewables Obligation Certificate | A UK support mechanism (now closed to new entrants) that required electricity suppliers to source a proportion of their electricity from eligible renewable sources. | |
| 280 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | ROI | Return on Investment | A financial metric measuring the profitability of an investment, calculated as the net return on investment divided by its cost. It's used to assess the financial case for energy efficiency measures. | |
| 281 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | SCOP | Seasonal Coefficient of Performance | A measure of a heating system’s average efficiency over an entire heating season, calculated as the total heat output divided by the total energy input. Unlike the standard COP, which reflects performance at a single operating point, SCOP provides a more representative assessment across a range of real-world conditions. | |
| 282 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 22/06/2026 04:44 PM | SEG | Smart Export Guarantee | A government-backed initiative that requires large electricity suppliers to pay homes and small businesses for excess renewable electricity they export back to the National Grid. It applies to renewable technologies up to 5MW. | https://www.ofgem.gov.uk/environmental-and-social-schemes/smart-export-guarantee-seg/smart-export-guarantee-seg-generators |
| 283 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | SHDF | Social Housing Decarbonisation Fund | A government fund specifically for upgrading the energy performance of social housing stock. | |
| 284 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | SMR | Small Modular Reactor | A nuclear reactor with a smaller generating capacity than conventional nuclear plants, designed for factory construction and deployment in a wider range of locations. | |
| 285 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | SPF | Seasonal Performance Factor | A key measure of a heat pump's efficiency over a full year, based on actual metered energy consumption rather than laboratory conditions. | |
| 286 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | SRO | Senior Reporting Officer | A key figure in government projects and programs, responsible for overseeing compliance and ensuring that projects meet their objectives. | |
| 287 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | SSEN | Scottish and Southern Electricity Networks | An electricity distribution network operator in the UK. | |
| 288 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | SSEP | Strategic Spatial Energy Plan | A plan aligning spatial planning and energy infrastructure to support Net Zero delivery. | |
| 289 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | STOR | Short Term Operating Reserve | GB electricity balancing service procured by the system operator, under which contracted providers deliver additional generation or demand reduction at short notice to help manage short‑term imbalances between electricity supply and demand. | |
| 290 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | TNUoS | Transmission Network Use of System charges | Charges for using UK's high-voltage electricity network. These charges help fund things like: maintaining electricity transmission lines, upgrading the national grid, connecting new renewable energy sources. The charges are managed nationally by the NESO and apply to all electricity users across the country. | |
| 291 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | TRV | Thermostatic Radiator Valve | A self-regulating valve fitted to a radiator that controls the flow of hot water by sensing room temperature, allowing individual room temperature control. | |
| 292 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | UFH | Underfloor Heating | A space heating system where pipes or electric elements are embedded in the floor to radiate heat upward. Particularly well-suited to heat pumps due to lower flow temperatures. | |
| 293 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | UKPN | UK Power Networks | The largest electricity distribution network operator in the UK, covering London, the South East, and the East of England. | |
| 294 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | ULEZ | Ultra Low Emission Zone | A stricter version of a Low Emission Zone, currently operating in Greater London, requiring vehicles to meet tight emission standards or pay a daily charge. | |
| 295 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | UPRN | Unique Property Reference Number | A unique digit identifier for every addressable location in Great Britain. | |
| 296 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | U-value | Thermal Transmittance | A measure of how well a building element (wall, roof, window) conducts heat, measured in W/m²K. Lower U-values mean better insulation and less heat loss. | |
| 297 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | V2G | Vehicle to Grid | A technology that allows electric vehicles to discharge stored energy back to the electricity grid, helping to balance grid demand and support renewable integration. | |
| 298 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | VRF | Variable Refrigerant Flow | A technology that uses variable flow of refrigerant to meet demand, allowing a simple outdoor unit to serve multiple indoor units and provide precise, independent temperature control across different zones. | |
| 299 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | WSHP | Water Source Heat Pump | A heat pump that extracts heat from a body of water such as a river, lake, or the sea, offering high efficiency where suitable water sources are available. | |
| 300 | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | jim.lott@es.catapult.org.uk | 15/06/2026 03:54 PM | ZEV | Zero Emission Vehicle | A vehicle that produces no direct tailpipe emissions, typically referring to battery electric or fuel cell vehicles. The UK has set ZEV mandates for car and van sales. |
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