Charles is correct. A transformer does not regenerate power, which is not to say that it won't be a highly effective solution. As properly defined, a regenerator consists of an oscillator that generates a 60Hz sine wave (or 50Hz, depending on the country), and a power amplifier which amplifies that signal so that a large amount of power can be provided. An internal DC power supply operating off of the the AC from the wall outlet (or in some cases batteries, when necessary) powers the oscillator and amplifier.
Regards,
-- Al