FireWheel Inter Grid System - the FIG System
Henry Works is currently testing a way of connecting a rotary power source, like the Human Dynamo, directly to the Grid.
We call this system the "FireWheel Inter Grid" system or "FIG" for short.
 
We will be testing this soon at The Green Micro Gym in Portland, OR.
What it means is that no special DC wiring is needed or inverters to hook up machines. The Dynamo will simply "plug in" to a standard socket and the power flows out through the cord into the circuit. If the power in the building goes out, the system stops producing power, making it entirely safe. 
As to your utility bill; the electrical meter slows down in relation to the inside power generated and if you have enough machines producing more than you are using, the meter will turn backwards! If you have produced more than you consumed for the month, most utility companies let you store this as a credit for the following month. (To make this much energy, the machines would have to be in use for most of the day). 
Stay tuned and we will report by the end of October how the FIG is doing.
Thanks! MT