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After the M9.0 earthquake in 2011, Japan has faced severe electric shortage. The tsunami caused by the earthquake destroyed many power plans along the coast lines, and still, sufficient power is not provided even in 2012. Electricity (i.e., power data) management using information and communication technology (ICT) is getting more and more popular these days. Many projects (not only by academia but also by vendors and service providers) have been established to control such electricity using the Internet technology. This paper reports the work of ”66kV power data management on the Internet space”, which we have built at five campuses of the University of Tokyo.