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.


Gate closure:

The time limit by which contract information and expected physical positions (FPNs) needs to be notified to the System Operator. Gate closure is now one hour prior to the settlement period.


The process of producing electrical energy by transforming other forms of energy. The amount of energy produced is expressed in watt hours.


Greenhouse gases. Under EU legislation they are defined as gases whose emissions contributes to climate change, in particular carbon dioxide and methane.


1 billion joules, approximately equal to 948,000 British thermal units.


The electricity transmission system.

Grid code:

The grid code is a technical document describing the interfaces between those parties that connect to and use the electricity transmission network.


Grid Trade Master Agreement.


Gigawatts – one thousand megawatts.


Gigawatt hours.