I feed my wood shop's 100 amp service from the main house's 200 amp service (about 90 ft). I also feed the 100 amp service to the 2 car garage with studio apt. above the same way (about 60 ft.) I was wondering if there is any way to meter the electricity usage at these two accessory buildings? Are there aftermarket meters or something that an electrician can install, or will the power company do such stuff? thanks......