Power and water on a narrowboat can be provided through off-grid sources, such as battery power, solar panels, and wind turbines. Battery power can provide a low-cost source of energy for running appliances and lighting on the boat. Solar panels can charge batteries and provide energy for appliances, lights and devices that use AC power. Wind turbines may also be used to generate electricity, but are generally more expensive. Water can be stored in containers and topped up when you stop in certain places or it can be collected from rainwater harvesting or from natural rivers and streams via pumping systems and cleaned via a filter system. It is important to ensure that regulations regarding the collection of potable water from rivers are followed when using this type of system.