We will skip the work done moving each leg forward for now. This works out to 0.1 horsepower while walking with a load. First we have to provide power to do all of this. A quick check of the local hardware store comes up short. In fact, the usual sources of power gives us a miserable selection, complete with assorted tradeoffs.
Batteries provide a poor energy density.
Fuel cells are not developed to the point where the average home hobbyist can use them. Internal combustion engines work quite well, but the thought of a chain saw engine buzzing around the house does not really fit my vision of the perfect domestic partner. Let's go back to the basics. The robot must carry its energy source around. The folks that measure the power output from the average human find that we are capable of less than one horsepower.