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 9: Actual System Proven in Operational Environment
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Sources
1. Fusion power - Wikipedia
WikipediaBackground, fusion reactor research originQuote, Background, fusion reactor research origin
Research on fusion reactors began in the 1940s.
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