ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins65% CONFIDENCEOverall confidence: 65%How well the pin's source and references back up its dates.Weighted average of how firmly 2 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence
Wikipedia's[2] Hellisheiði Power Station article says electricity production with the first two 45 MW turbines commenced in 2006, without giving an exact day.Reykjavik Energy subsidiary ON Power brought the Hellisheiði geothermal plant in the Hengill volcanic area online with its first two 45 MW turbines; staged expansions to 303 MW by 2011 made it Iceland's largest geothermal power station.
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