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 Maturity
Sources
1. Heat engine - Wikipedia
History, industrial revolution practical useQuote, History, industrial revolution practical use
Heat engines have been known since antiquity but were only made into useful devices at the time of the industrial revolution in the 18th century.
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