Ofgem, the Office of Gas and Electricity Markets, is a non-ministerial government department and an independent National Regulatory Authority, recognised by EU Directives. Its principal objective is to protect the interests of existing and future electricity and gas consumers.
BEIS, Department for Business, Energy & Industrial Strategy replaced the Department for Business, Innovation and Skills (BIS) and the Department of Energy and Climate Change (DECC) in July 2016. BEIS is responsible for business; industrial strategy; science, research and innovation; energy and clean growth; and climate change.
National Grid ESO is the Electricity System Operator for Great Britain. Its licence was established under the Electricity Act 1989 and requires it to develop, maintain, and operate economic and efficient networks and to facilitate competition in the supply of electricity.
National Grid Gas (NGG) is the system operator of the gas transmission network. It owns, manages, and operates the national gas transmission network (NTS) in Great Britain.
Elexon Ltd is a wholly owned, arm’s length subsidiary of National Grid, and is responsible for the administration of the Balancing and Settlement Code (BSC) and to provide and procure the services needed to implement it. Elexon manages electricity settlements in Great Britain and provides demand and generation data for transmission-connected plant. Elexon also publishes REMIT information issued by BSC Parties, including interconnectors.
Gridwatch is a private website run by an electrical engineer which scrapes the data from Elexon’s BMreports site every 5 minutes and injects it into an SQL database to allow for easy searches and statistical analyses. The data are available to download and can also be viewed on the website’s dashboard in the form of analogue instruments and moving graphs.
MyGridGB is run by Andrew Crossland, a power systems specialist, and provides analysis of GB electricity volumes being produced and consumed, in real time, as well as historical data. It uses data from Sheffield University and Elexon. There are also blogs by Andrew and guest authors. The graphic to the right is linked to the MyGridGB website.
The Digest of United Kingdom Energy Statistics (DUKES) is produced by the UK Government and contains extensive tables, charts and commentary; separate sections on coal, petroleum, gas, electricity, renewables and combined heat and power; and a comprehensive picture of energy production and use over the last 5 years, with key series taken back to 1970.
Sheffield Solar is a collaboration between Sheffield University and National Grid which publishes estimated solar PV generation in Great Britain. The data are updated every 30 minutes during daylight hours.
EDF Energy owns and operates the UK’s fleet of eight nuclear power stations and publishes a weekday update of the status of easch reactor showing whether they were in service, what they were generating, and their next planned outage. The site also details the reasons for any reactor to be offline and its expected retuen to service.
Energy Matters is possibly the best and most analytical energy blog around. It is run by geologists, Euan Mearns and Roger Andrews, who delve into actual data in order to stimulate discussion on various sapects of global energy markets. The comments are well worth reading as the blog attracts high quality input from scientists and enginners.  
Utility Week is an independent media brand for the UK’s utilities industries, covering policy&regulation, strategy, generation, networks, retail markets and flexibility.
Network, is a sister publication to Utility Week and is aimed at engineers in the UK’s gas, power and heat networks. The magazine is published monthly and there is news, blogs and opinion on the website.
The Energyst is an anergy magazine aimed at Energy, Facilities and Building Service Managers and Directors within the UK’s industrial, commercial and public sector industries. It features new energy technologies and strategies as well as commentary on legislative and policy changes.
World Nuclear News is an excellent source of information and news on the global nuclear industry. WNN is supported by the World Nuclear Association whose global network of contacts includes key personnel in enterprises that account for virtually all the world’s uranium mining, nuclear fuel manufacture, equipment production and nuclear power generation.

Beginner’s Guide to Elecricity Markets, Elexon