If it didn't work, they'd look for investors.
I think Steorn is looking beyond the grid. CEO Sean McCarthy has stated, “The availability of free energy will change everything, the availability of free energy in the form of Orbo is even more significant since it can be engineered directly into devices, i.e. no grid connections are required. So Orbo will impact every aspect of our lives”
http://www.freeenergytimes.com/?p=46
Actually their business model is to liscense it to others and let anyone develop it, you can sign up for the ability to do so on their site easily. I hope it’s real, we are going to need all the extra energy to warm up the planet with this new ice-age coming on!