The USB connection developed in the 1990s is able to transmit data from the computer to other devices and supply them with 5 V DC electric power. This clustering of functions already responds to one of the core principles of the Blue Economy, but the electricity usually comes from the AC grid and much power is lost in conversion.
Jonathan Cedar from Vermont (USA) has developed a wooden stove which gathers part of the heat energy produced in combustion to generate electricity which is used for a fan that optimizes combustion, reduces smoke and saves firewood. The surplus in electricity is available to the user via an USB Bus to charge cellphones, power LED lights or many other devices.
This smart way of power generation is suitable for regions of the Third World without a grid where people use to cook and heat their homes with firewood. Additionally Jon has developed a camping stove for outdoorsmen which works in the same way. The business idea for sale is just as smart: the camping stove is cross-financing the stoves for the Third World so that people who really need them can also afford them.