I just wrote up a page about my latest project that I’ve just about finished up now: monitoring the electricity usage in our house, and modding my UPS so it runs for longer than it’s designed to.
Since energy prices are constantly on the rise it would be wise to use as little of it as possible, but of course being a computer geek I run a server 24/7 in the house which makes up a large portion of our electricity use. I decided to monitor our electricity use at the server side and at the main fuse board so that, after figuring out what causes what spike and for how long, we can cut down our spending.
The other part of the project was to hack my UPS a bit to extend its battery run-time from 18 minutes to around an hour by adding some more batteries. The electricity board like to cut the power off for extended periods of time so the longer the server can run on batteries the better.