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Principal operations

Our principal operations are the ownership and operation of regulated electricity and gas infrastructure networks in the UK and the US, serving around 19 million consumers directly and many more indirectly. We also have interests in related markets, including electricity interconnectors, metering services, liquefied natural gas (LNG) facilities and property in the UK, LNG storage and transportation, unregulated gas transmission pipelines and home energy services in the US.

We have approximately 27,600 employees located in the UK and the US.

The performances of our principal businesses are reported by segment, reflecting the management responsibilities and economic characteristics of each activity. Our principal businesses and segments, together with other activities and discontinued operations, are as follows:

Businesses and segments		Description of principal activities
Transmission	UK	The transmission of electricity and gas in the UK as owner and operator of the high-voltage electricity transmission network in England and Wales, the gas national transmission system in Great Britain, electricity interconnectors with Scotland and with France and storage facilities for LNG. Operator of the electricity transmission networks in Scotland.
	US	The transmission of electricity in the northeastern US as owner of high-voltage electricity transmission networks in upstate New York and in New England.
Gas Distribution	UK	The distribution of gas in England as owner and operator of four of the UK’s eight gas distribution networks.
	US	The distribution of gas in the northeastern US as owner and operator of gas distribution networks in upstate New York, New York City, Long Island, Massachusetts, New Hampshire and Rhode Island.
Electricity Distribution & Generation	US	The distribution and generation of electricity in the northeastern US as owner of electricity distribution networks in upstate New York, Massachusetts, New Hampshire and Rhode Island, as operator and manager of the electricity transmission and distribution network in Long Island on behalf of the Long Island Power Authority, and as a generator of electricity on Long Island.
Non-regulated businesses and other		The delivery of other services in markets related to our principal operations, principally in the UK where they comprise metering services, property management and our LNG import terminal on the Isle of Grain. They do not constitute a segment in their own right and so are reported together with other operations and corporate activities, including business development, under the heading ‘other activities’.
Discontinued operations		Businesses that we have exited or are committed to exit, including the Ravenswood generation station in New York City that we have agreed to sell, our UK and US wireless infrastructure operations, sold on 3 April and 15 August 2007 respectively, and the Basslink electricity interconnector in Australia sold on 31 August 2007.