Please go the nearest EB Office in your town or city. You ask for the Electricity Connection Ownership transfer form. They will give the form which is readily available with them. Just fill the same seller details, buyer details EB Connection Details, with transfering charges. Surely within a week's time it will get transfered on your name.
Similarly for changing the EB Connection from Domestic to Commercial rate and have the contracted power supply, same way take the lease/purchase deed of the building or rental agreement paper, make a letter in your company letter head stating the same whatever you have asked. Surely your connection will get shifted from Domestic Usage connection to Commercial Connection.
9th August 2011 From India, Kumbakonam