You can monitor the UK National Grid inputs and transfers, sales, demand etc. in almost real time here http://www.bmreports.com/bsp/bsp.php
You need flash, I've never got this page to work in Chrome, but it works in Firefox
You need flash, I've never got this page to work in Chrome, but it works in Firefox
Someone used its API (/api/json) to make a load-sensitive kettle: