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Context: Bydd nwy’n parhau i chwarae rôl wrth newid i system ynni carbon isel, ac o ystyried heriau sicrwydd ynni, mae angen gwerthuso potensial nwy anghonfensiynol yng Nghymru a’r cyfleoedd economaidd a allai ddeillio o unrhyw ddatblygiad.
