St Mary's Junior School in Hornsey, North London, UK has saved £1,200 per year using Earthpill:
"We itemised and measured every electrical item in the school using the Earthpill web-site and produced totals which showed that 67% of the consumption was due to lighting." This led to school applying for and being awarded a grant from ENCAMS to fit PIR occupancy detectors to all rooms. The school's site manager, Ian Bruce, has calculated that this will save them 10,000 kWh (£1,200) per year which is around 15% of their total electricity use.
Full article (in French): http://www.display-campaign.org/article935.html