The following definitions reflect those used by the International Energy Agency (IEA); definitions used by other organisations and publications may vary.
Implementing Agreements, also known as Multilateral Technology Initiatives or Energy Technology Initiatives (of the IEA). List of initiatives as of 2015:
Industry Advisory Board (of the IEA)
internal combustion engine
Initial Contingency Response Plan
information and communications technologies
Innovation China-United Kingdom
In-Depth Reviews (IEA publications focusing on specific countries)
integrated energy policy
integrated gasification combined cycle
International Low-Carbon Energy Technology Platform
international oil company
industries of the future
initial public offering
independent power producer
intellectual property rights
internal rates of return
in situ leaching
a sector that includes fuel used within the manufacturing and construction industries. Key industry sectors include iron and steel, chemical and petrochemical, non-metallic minerals, and pulp and paper. Use by industries for the transformation of energy into another form or for the production of fuels is excluded and reported separately under other energy sector. Consumption of fuels for the transport of goods is reported as part of the transport sector.
a technology in which a solid or liquid fuel (coal, heavy oil or biomass) is gasified, followed by use for electricity generation in a combined-cycle power plant. IGCC is widely considered a promising electricity generation technology, due to its potential to achieve high efficiencies and low emissions.
This category includes the deliveries of aviation fuels to aircraft for international aviation. Fuels used by airlines for their road vehicles are excluded. The domestic/international split is determined on the basis of departure and landing locations and not by the nationality of the airline. For many countries this incorrectly excludes fuels used by domestically owned carriers for their international departures.
This category covers those quantities delivered to ships of all flags that are engaged in international navigation. The international navigation may take place at sea, on inland lakes and waterways, and in coastal waters. Consumption by ships engaged in domestic navigation is excluded. The domestic/international split is determined on the basis of port of departure and port of arrival, and not by the flag or nationality of the ship. Consumption by fishing vessels and by military forces is also excluded and included in residential, services and agriculture.