[tadfisher]

Neutrinos interact extremely weakly with ordinary matter, which is why the detectors are typically huge volumes of water. Even then, the neutrinos interact with the purpose-built detectors on the order of one in a trillion. A neutrino power generator is not a feasible thing to build.

[TheOtherHobbes]

Unless you're next to an exploding star, in which case you have other problems/opportunities.