With all the hype surrounding Bloom Energy’s newly launched Bloom Box, it may be tempting to view the new device as a cure-all for the world’s energy concerns. After all, the promise of an on-site power source that can provide homes with reliable clean energy at an affordable price seems like nothing short of a panacea. Just how affordable the devices will really be has already been questioned. In addition, given the Bloom Box’s use of natural gas and biofuels, it’s not entirely clear how clean or green it will be in the long term.