where are sunbeam microwaves made?
Florida
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 Solar power towers use thousands of individual sun @-@ tracking mirrors ( called heliostats ) to reflect solar energy onto a central receiver located on top of a tall tower . The receiver collects the sun 's heat in a heat @-@ transfer fluid that flows through the receiver . The U.S. Department of Energy , with a consortium of utilities and industry , built the first two large @-@ scale , demonstration solar power towers in the desert near Barstow , California . 

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 Plans for a Hubble successor materialized as the Next Generation Space Telescope project , which culminated in plans for the James Webb Space Telescope ( JWST ) , the formal successor of Hubble . Very different from a scaled @-@ up Hubble , it is designed to operate colder and farther away from the Earth at the L2 Lagrangian point , where thermal and optical interference from the Earth and Moon are lessened . It is not engineered to be fully serviceable ( such as replaceable instruments ) , but the design includes a docking ring to enable visits from other spacecraft . A main scientific goal of JWST is to observe the most distant objects in the universe , beyond the reach of existing instruments . It is expected to detect stars in the early Universe approximately 280 million years older than stars HST now detects . The telescope is an international collaboration between NASA , the European Space Agency , and the Canadian Space Agency since 1996 , and is planned for launch on an Ariane 5 rocket . Although JWST is primarily an infrared instrument , its coverage extends down to 600 nm wavelength light , or roughly orange in the visible spectrum . A typical human eye can see to about 750 nm wavelength light , so there is some overlap with the longest visible wavelength bands , including orange and red light . 

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 German technology conglomerate ThyssenKrupp broke ground on a $ 4 @.@ 65 billion combined stainless and carbon steel processing facility in Calvert , a few miles north of Mobile , in 2007 . It was originally projected to eventually employ 2 @,@ 700 people . The facility became operational in July 2010 . 

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 The structure of the Doughnut is designed to minimise any potential effect of a fire or a terrorist attack on the building ; it also includes independent power generators which can supply power to the facilities in an emergency . About 3 @,@ 000 kilometres ( 1 @,@ 850 mi ) of fibre optics were installed in the Doughnut by British Telecom , and about 10 @,@ 000 km ( 6 @,@ 000 mi ) of electrical wiring were used in the building . 

entailment
 Phase change materials such as paraffin wax and Glauber 's salt are another thermal storage medium . These materials are inexpensive , readily available , and can deliver domestically useful temperatures ( approximately 64 ° C or 147 ° F ) . The " Dover House " ( in Dover , Massachusetts ) was the first to use a Glauber 's salt heating system , in 1948 . Solar energy can also be stored at high temperatures using molten salts . Salts are an effective storage medium because they are low @-@ cost , have a high specific heat capacity and can deliver heat at temperatures compatible with conventional power systems . The Solar Two project used this method of energy storage , allowing it to store 1 @.@ 44 terajoules ( 400 @,@ 000 kWh ) in its 68 m ³ storage tank with an annual storage efficiency of about 99 % . 
