Definition: A situation where there is a difference between the amount of power produced (supply) and the amount of electricity contracted or sold (demand).




Definition: Where a site consumes electricity as opposed to generating exporting power.




Definition: A sharply defined change in a series of input data being studied, such as market prices or volume.


Impulse Wave


Definition: A wave or cycle of waves that carry the current trend further in the same direction.




Definition: A numerical value assigned to a group of commodities, stocks. or prices in order to give an indication of market trends.




Definition: A subset of market measuring tools used specifically for monitoring and forecasting.




Definition: A persistent increase in the level of consumer prices or a persistent decline in the purchasing power of money. The rate at which this increase occurs 

is expressed as a percentage over a period of time, usually a year.




Definition: The process of placing natural gas in underground storage or the producing reservoir in order to maintain pressure.




Definition: A cable connection allowing electricity to flow between two countries or markets.


Interconnector United Kingdom (IUK)


Definition: Interconnector (UK) Limited, the consortium of European energy companies that owns and operates the Bacton interconnector.


Interconnexion France Angleterre (IFA)


Definition: The England-France Interconnector is a 2,000MW high-voltage direct current (HVDC) link between the French and British transmission systems with ownership shared between National Grid and Réseau de Transport d'Electricité (RTE).


Intercontinental Exchange (ICE)


Definition: A major operator of regulated exchanges and clearing houses serving the risk management needs of global markets for agricultural, credit, currency, emissions, energy, and equity index products.


International Monetary Fund (IMF)


Definition: An organisation of 188 countries, working to foster global monetary cooperation, secure financial stability, facilitate international trade, promote high employment and sustainable economic growth, and reduce poverty around the world.


International Petroleum Exchange (IPE)


Definition: Formerly an independent London energy exchange, in June 2001, the IPE became a wholly owned subsidiary of Intercontinental Exchange. It offers futures and options contracts for energy products including oil, gasoil, natural gas, and power.


Interruptible Service


Definition: Gas contracts that are subject to interruption for a specified number of days or hours during times of peak demand or in the event of system emergencies. In exchange for interruption to their supply, buyers pay lower prices.


Isle of Grain


Definition: LNG import and storage facility.


Isle of Man to England Interconnector


Definition: A submarine power cable connecting the transmission system of the Manx Electricity Authority to that of Great Britain. With an undersea section of approximately 104 kilometers, it is the longest AC undersea cable in the world.