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In page Solar thermal collector:

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A 15-metre (49 ft) diameter Auroville solar bowl was developed from an earlier test of a 3.5-metre (11 ft) bowl in 1979–1982 by the Tata Energy Research Institute. That test showed the use of the solar bowl in the production of steam for cooking. The full-scale project to build a solar bowl and kitchen ran from 1996 and was fully operational by 2001.[citation needed]