Sources not yet in widespread commercial use, including nuclear fusion, thorium fuel cycles, methane hydrates and ocean thermal energy conversion, each demonstrated at pilot or experimental scale but not yet a mainstream contributor to world energy supply. Belongs here: any source whose technology readiness keeps it short of commercial deployment. Does not belong here: nuclear fission, which is commercially deployed worldwide and is grouped under Nuclear Fission; a source that reaches commercial-scale deployment should move out of this group in a future pass.
Prospective
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