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Gas-fired Generation 

This is the tern used to describe electricity that is generated through gas-fired power stations such as Combined Cycle Gas Turbines (CCGT).

Gas Storage

Facilities that store natural gas for an indefinite period of time for later consumption.


This covers the production of electricity at power stations. At present the main fuels used are gas, nuclear and coal, although there is now a growing use of renewable forms of energy, such as wind power, the burning of gas from landfill and waste incineration.

Generation Capacity

The power output rating of a generator measured on an instantaneous basis, typically measured in megawatts.

Giga Watt (GW) 

This is the unit of measurement used for electricity 1 Giga Watt = 1,000 MW.

Global Warming

The gradual increase in the average temperature of the Earth’s surface and atmosphere. The majority of scientists agree that the current warming we are experiencing is caused by the release of greenhouse gases from the burning of fossil fuels and other industrial processes. A gradual increase in the world’s average temperature, due to the release of fossil fuels such as oil, gas and coal into the atmosphere.

Green Certificate 

This is a document authenticating that electricity has been generated using only renewable sources. The certificates can be traded separately from the energy produced.

Greenhouse Effect 

This is the term given to the process wherein gases in the earth’s atmosphere trap heat. The build-up of these gases, especially carbon dioxide, are thought to cause global warming.

Green House Gas (GHG)         

These are gasses which have the ability of trapping heat, especially when present in the upper atmosphere. Greenhouse gases include water vapour, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), halogenated fluorocarbons (HCFCs), ozone (O3), perfluorinated carbons (PFCs), and hydrofluorocarbons (HFCs). These gases contribute to the 'greenhouse effect'.

Green Investment Bank

This is an innovative public financial institution which focuses on supporting and scaling up private, low-carbon projects throughout the green economy. 
As we all know knowledge is power, especially within our industry. If you want to know more about any terms covered, please get in touch on 0800 61 22 200 or email us at  

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