This dimension marks how mature a specific energy technology actually is, experimental, emerging or fully commercial. Wikipedia notes that "in some geographic localities, photovoltaic solar or onshore wind is the cheapest new-build electricity," a sign of just how mature those particular technologies have become. Browsing by maturity separates technologies still emerging from those already fully commercial.
Facts
Comparison
Era of Emergence Physical Basis TRL 3: Experimental Proof of Concept
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Sources
1. Electrolysis of water - Wikipedia
WikipediaHistory, 1800 electrolysis of waterQuote, History, 1800 electrolysis of water
In 1800, Alessandro Volta invented the voltaic pile, while a few weeks later English scientists William Nicholson and Anthony Carlisle used it to electrolyse water.
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