Query: If every house in Florida had a solar-heated water tank, that would eliminate consumption by 17 percent.

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Solar water heating <=SEP=> Solar water heating ( SWH ) is the conversion of sunlight into heat for water heating using a solar thermal collector . A variety of configurations are available at varying cost to provide solutions in different climates and latitudes . SWHs are widely used for residential and some industrial applications .   A sun-facing collector heats a working fluid that passes into a storage system for later use . SWH are active ( pumped ) and passive ( convection-driven ) . They use water only , or both water and a working fluid . They are heated directly or via light-concentrating mirrors . They operate independently or as hybrids with electric or gas heaters . In large-scale installations , mirrors may concentrate sunlight onto a smaller collector .   The global solar thermal market is dominated by China , Europe , Japan and India , although Israel was one of the first countries to mandate installation of SWH in 1980 , leading to a flourishing industry .

Water heating <=SEP=> Water heating is a thermodynamic process that uses an energy source to heat water above its initial temperature . Typical domestic uses of hot water include cooking , cleaning , bathing , and space heating . In industry , hot water and water heated to steam have many uses .   Domestically , water is traditionally heated in vessels known as water heaters , kettles , cauldrons , pots , or coppers . These metal vessels that heat a batch of water do not produce a continual supply of heated water at a preset temperature . Rarely , hot water occurs naturally , usually from natural hot springs . The temperature varies with the consumption rate , becoming cooler as flow increases .   Appliances that provide a continual supply of hot water are called water heaters , hot water heaters , hot water tanks , boilers , heat exchangers , geysers , or calorifiers . These names depend on region , and whether they heat potable or non-potable water , are in domestic or industrial use , and their energy source . In domestic installations , potable water heated for uses other than space heating is also called domestic hot water ( DHW ) .   Fossil fuels ( natural gas , liquefied petroleum gas , oil ) , or solid fuels are commonly used for heating water . These may be consumed directly or may produce electricity that , in turn , heats water . Electricity to heat water may also come from any other electrical source , such as nuclear power or renewable energy . Alternative energy such as solar energy , heat pumps , hot water heat recycling , and geothermal heating can also heat water , often in combination with backup systems powered by fossil fuels or electricity .   Densely populated urban areas of some countries provide district heating of hot water . This is especially the case in Scandinavia and Finland . District heating systems supply energy for water heating and space heating from waste heat from industries , power plants , incinerators , geothermal heating , and central solar heating . Actual heating of tap water is performed in heat exchangers at the consumers ' premises . Generally the consumer has no in-building backup system , due to the expected high availability of district heating systems .

Solar power <=SEP=> Solar power is the conversion of energy from sunlight into electricity , either directly using photovoltaics ( PV ) , or indirectly using concentrated solar power . Concentrated solar power systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam . Photovoltaic cells convert light into an electric current using the photovoltaic effect .   Photovoltaics were initially solely used as a source of electricity for small and medium-sized applications , from the calculator powered by a single solar cell to remote homes powered by an off-grid rooftop PV system . Commercial concentrated solar power plants were first developed in the 1980s . The 392 MW Ivanpah installation is the largest concentrating solar power plant in the world , located in the Mojave Desert of California .   As the cost of solar electricity has fallen , the number of grid-connected solar PV systems has grown into the millions and utility-scale solar power stations with hundreds of megawatts are being built . Solar PV is rapidly becoming an inexpensive , low-carbon technology to harness renewable energy from the Sun . The current largest photovoltaic power station in the world is the 850 MW Longyangxia Dam Solar Park , in Qinghai , China .   The International Energy Agency projected in 2014 that under its `` high renewables '' scenario , by 2050 , solar photovoltaics and concentrated solar power would contribute about 16 and 11 percent , respectively , of the worldwide electricity consumption , and solar would be the world 's largest source of electricity . Most solar installations would be in China and India . Currently , as of 2016 , solar power provides just 1 % of total worldwide electricity production but growing 33 % per annum .