Which alternative energy sources are practical for use in business home or schools now?

Practical alternative energy sources for businesses, homes, and schools include solar power, wind energy, and geothermal systems. Solar panels can be easily installed on rooftops, providing a renewable source of electricity, while small wind turbines can be effective in areas with sufficient wind resources. Additionally, geothermal heat pumps offer efficient heating and cooling solutions. These technologies are increasingly affordable and accessible, making them viable options for various settings.