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. Energy storage - Wikipedia
WikipediaHistory, pumped hydro longevityQuote, History, pumped hydro longevity
Large hydropower dams have been energy storage sites for more than one hundred years.
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