The document discusses various alternative energy sources in Germany including solar energy, hydropower, wind power, biomass, and geothermal power. Solar energy is well-suited for Germany as it can provide electricity and heat water efficiently. Hydropower supplies 19% of the world's energy but requires flooding and can be expensive. Wind power now feeds 6.4% of Germany's energy demand and is growing, especially in northern regions. Biomass is a renewable source that can use various living organisms and leftover foods. Geothermal power extracts heat from the earth and can generate a small percentage of global electricity.