01:32Science In Action'Free' water and electricity for the world?BBC World Service Duration: 30 minutes Mon 15th Jul 2019, 01:32 on BBC World Service Americas and the CaribbeanAvailable for over a yearListen nowThe solar panel which simultaneously produces electricity and purifies water Show more GenresFactualScience & NatureFormatsMagazines & ReviewsBrandScience In Action Source: BBC Online