The development of alternative energy production requires a strong technical foundation to operate energy generation systems and equipment. To generate energy, alternative energy plant and system technicians operate machinery such as valves, pumps, and generators. They keep gauges and metres in check to guarantee safe and effective production, and they change equipment as needed. In addition, they evaluate equipment and perform maintenance and repairs. These technicians operate with a range of fuel types, including: Biofuels are made from corn, sugarcane, soybeans, and other plants. Technicians spin centrifuges and other equipment to create biofuels at a consistent rate; the fuel is then lab-tested to guarantee quality and consistency. Methane gas is collected from landfills, where it rises from decomposing solid waste in municipal stations. Technicians monitor the environment, repair pump and blower systems, and troubleshoot issues that arise during the capture, conversion, and use of gases as a renewable energy resource. The principal sources of biomass that technicians transform into energy are woody debris and animal dung. They adjust energy production and take measurements with metres and gauges. The force of water released from a dam moves the blades of a turbine, creating energy at hydropower facilities. Technicians ensure that generators and other equipment operate properly. A high school diploma is normally required for jobs in these industries, while hydroelectric plant technicians may require specialised technical training or an associate's degree.