Like many industries, the energy industry has developed an language all of it's own. Brokers and suppliers talk about Duos Charges and Triads and avialabiity, but what to they actually mean?

We've put together what we think is the most complete glossary of energy terms on the net, if you can't find what you're looking for here give us a call and we'll see if we can help you.



Electricity Association.


Energy Contract Volume Aggregation Agent (provided by Logica).


Energy Contract Volume Notification Agent. The body responsible for submitting ECVN’s on behalf of the two contracting parties. This could be one of the counterparties or a third party.


Electronic dispatch and logging, which is the communication system between physical players in the wholesale market and NGC.


Electronic Data Transfer.


The Energy Efficiency Commitment introduced by the government in 2002. The initial scheme ran to end March 2005.


Electricity Forward Agreement. A short to medium term electricity swap. EFAs are traded in the over-the–counter electricity forward market.


Exchange of futures contracts for physicals. Allows a buyer or seller to exchange a futures position for a physical position of equal quantity by submitting a notice to the exchange.

Energy Information Administration

The Energy Information Administration (EIA), created by Congress in 1977, is a statistical agency of the U.S. Department of Energy. It provides policy-independent data, forecasts, and analyses to promote sound policy making, efficient markets, and public understanding regarding energy and its interaction with the economy and the environment.

Electricity Forward Market:

A brokered over-the-counter market in the UK for short-to-medium-term electricity derivative instruments, of which the most widely used is the electricity forward agreement.

Electronic Trading:

Internet-based trading on a real-time basis that has become a significant addition to the energy and commodities trading market in the past four years.


Trading name of the BSC company, which administers BSC.


Energy Management Information System.

Embedded generation:

See Distributed Generation above.

Energy efficiency:

Amount of useful output achieved for each unit of energy delivered. Energy efficiency is increased in two main ways; reducing wasted energy and increasing the power efficiency of appliances.

Energy imbalance:

Imbalances derived from the difference between the metered volumes and notified contract volumes aggregated to the energy account level, for any settlement period.

Energy imbalance charges:

Charges applied to energy imbalances.

Energy mix:

Distribution of different energy sources within the total supply.


Emissions Trading Group advising the UK Government on the implementation of the EU ETS, and its inter-relationships with UK ETS, CCAs and other measures.


Energy Technology Support Unit formerly of the DTI, now the privatised Future Energy Solutions.


EU Emissions Trading Scheme one of the policies being introduced across Europe to tackle emissions of carbon dioxide and other greenhouse gases and combat the serious threat of climate change. Phase 3 of the scheme commenced on January 1st 2008.  Under the scheme, each European Member State has to establish a National Allocation Plan, consistent with their Kyoto Treaty Obligations. Each NAP determines which industries and sites are included, and the amount of EUAs that each site will be allocated. Organisations that are required to be members of the scheme are awarded EUAs, and at the end of each year have to surrender EUAs matching their annual CO2 emissions. If the organisation has a shortfall of EUAs, then they must purchase them from those that have surpluses.  EUAs can be used in any EU Country, regardless of origin.


An electronic platform or open outcry forum for the buying and selling of energy contacts.


The process of converting an options contract into a futures or physical position.


External impacts associated with power generation, but not traditionally costed into the energy price.