By Richard Black
Environment correspondent, BBC News website
E-Day aimed to raise awareness on energy saving and climate
The UK's first Energy Saving Day has ended with no noticeable reduction in the country's electricity usage.
E-Day asked people to switch off electrical devices they did not need over a period of 24 hours, with the National Grid monitoring consumption.
It found that electricity usage was almost exactly what would have been expected without E-Day.
Colder weather than forecast in some regions may have led to higher use of heating, masking any small savings.
The event also received very little publicity, despite having backing from campaign groups such as Greenpeace, Christian Aid and the RSPB, and from major energy companies such as EDF, E.On and Scottish Power.
E-Day did not succeed in cutting the UK's electricity demand