Biomass is an alternative power source that can be generated from organic waste materials like food scraps, garden waste, wood, and manure. The document discusses how biomass power works, providing examples of its use in landfills in Auckland and Wellington, New Zealand to generate electricity. It suggests schools could also use biomass power by collecting organic waste to fuel an on-site biogas plant and burn wood pellets to heat boilers, providing a cheap, sustainable energy option.