The Coin Lamp brings you energy on a tight budget. Insert your coins in this coin-operated light source to bask in its light but if you run out of money, its lights out baby. Energy doesn’t come for free with the Coin Lamp

The solar cell tree charger by Vivien Mullar is a concept USB charger that pays homage to the environment twice. First by being in the shape of a futuristic tree and then by using solar energy to charge all your household gadgets. Everyone’s a winner.

Revo power generating exercise bike

The idea of exercise bikes that generate energy had been around for a while but nothing solid has yet hit the market. The Revo power generating exercise bike by British designer Tim Maughan is another concept in the same vein but with designs like this, the market may come calling sooner rather than later. GadgetHeat likes to work up a sweat from time to tim and the Revo makes is just a little but more worthwhile when you know that you are also gaining power to …