15 terms:


Eco-driving involves driving in a more efficient way in order to improve fuel economy. Examples of eco-driving techniques include driving at an appropriate speed, not over-revving, ensuring tyres are correctly inflated, removing roof racks and reducing unnecessary weight.

Electric vehicle

Vehicle capable of full electric operation fuelled by battery power driven by an electric motor. These include battery electric (BEV), plug-in hybrid electric (PHEV) and hydrogen fuel-cell vehicles.

Electricity Market Reform

Current reform of the electricity market, including provision of support for low-carbon generation through Feed-in Tariffs with Contracts for Difference (FiT CfDs).

Electricity Networks Strategy Group (ENSG)

Joint government and industry group addressing key strategic issues affecting electricity networks in the shift to a low-carbon economy.


The use of electricity to split water into its constituent parts: hydrogen and oxygen

Emissions Performance Standard (EPS)

Regulation setting a maximum level of allowable emissions from power plants.

Energy Company Obligation (ECO)

A new Energy Company Obligation will replace CERT, CESP and Warmfront from autumn 2012 to deliver carbon savings and help alleviate fuel poverty. The cost of the measures will be passed through to consumer energy bills.

Energy Efficiency Design Index (EEDI)

IMO regulation, agreed in 2011, setting minimum energy efficiency standards for new ships.

Energy intensity

A measure of total primary energy use per unit of gross domestic product.

Energy Performance Certificate (EPC)

The certificate provides a rating for residential and commercial buildings, showing their energy efficiency based on the performance of the building itself and its services (such as heating and lighting). EPCs are required whenever a building is built, sold or rented out.

Enteric fermentation

Fermentation process that takes place in the digestive systems of ruminant animals (e.g. cattle and sheep) to break down hard-to-digest grassy materials, leading to the release of methane.

European Commission (EC)

Executive arm of the European Union.

European Union Allowances (EUAs)

Emissions credits traded within the EU ETS.

European Union Emissions Trading Scheme (EU ETS)

Cap and trade system within the EU covering the power sector, energy-intensive industry and, from the start of 2012, all domestic and international aviation.

Extended Ambition scenario

Emissions reduction scenario for measures to 2020, developed in our 2008 report and updated in our 2009 and 2010 progress reports. We recommended that the measures in this scenario should be implemented given the need to prepare for the 2050 target and the relative cost-effectiveness of many of the measures.