I ' ve never seen a deaf dog do competitive herding ! I ' m not involved in that sport and there ' s no reason they couldn ' t , but I ' d love to see that in person . I definitely think they are more responsive than my hearing dogs . I hear people say all the time they can never be off leash but I think if you work with them they ' re just as responsive as any other trained dog , at least . <| sep |> There are many potential business models . A popular one in the US is for a company to install the cells on your house for free , and then you pay a reduced electricity rate then all the excess belongs to the company who sell it to the grid for extra profit . This circumvents the cost of land . A winwin . If it was that easy to make money doing it . Someone would be doing it . So why aren ' t they ? Is it just the lack of land ? Is it the worry that PVs will fall in price so much so that someone else will come in and underbid you ? The true reasons are numerous and complicated . e . g . the government lowering the feedin tariff , and the prices constantly lowering on buying cells so people trying to discern when the best time is to get in . Both of those issues don ' t really effect the government to the same extent however .