With improvements in technology, today's smaller hydro projects can be designed to minimize harm to fish and wildlife populations. Hydroelectric plants that do not require reservoir capacity, called low impact or run-of-river, are much preferred by environmentalists due to their reduced impact on natural landscapes.
A tidal power plant, which makes use of the daily rise and fall of tides, is another alternative to large-scale hydropower and is very effective due to its high predictability. A less common technology is kinetic hydropower, which can generate electricity by converting the energy found in the flowing water currents of oceans, tides, or rivers. Neither tidal and kinetic hydropower are widely deployed.