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 BasisElectrochemical Reaction 1 Maturity
Sources
1. Fuel cell - Wikipedia
WikipediaHistory, first fuel cell referencesQuote, History, first fuel cell references
The first references to hydrogen fuel cells appeared in 1838.
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