I believe the clue is in the first three sentences of this blog post. I didn't know about it, and I bet most of you didn't either. If a paid-up environmental blogger could fail to notice that a national energy saving day was happening, then someone somewhere stuffed up the publicity very badly indeed.
According a BBC news story about it:
The E-Day concept started life as Planet Relief, an awareness-raising BBC TV programme with a significant comedy element.
But in September the BBC decided to pull the project, saying viewers preferred factual or documentary programmes about climate change.
Now that sounds like a good idea to me: a sort of Comic Relief for the planet. Instead we've had a damp squib. Apparently there is going to be another one next year. I hope it's better publicised than this one, or it will be a huge waste of energy.