This fence was made with welded livestock panels. It will not let a bear through and is electrified. Sometimes a determined bear will try to tunnel underneath it.
Right now in the MN Legislature there is a movement being put forth to make the bear the state mammal. I think most beekeepers would not be in the favor of the motion.
MN DNR pdf graphic on electric bear fence. I think the pricing they have in the document is several years old. But the construction is sound and will work.
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CFAQFjAB&url=http%3A%2F%2Ffiles.dnr.state.mn.us%2Fassistance%2Fbackyard%2Fprivatelandsprogram%2Fbeehive_protection_with_electric_fence.pdf&ei=EsRrT_DTGs_egQeKoPCTBg&usg=AFQjCNEV3WeUEkLaZ4YUelEothKmr6sLkw