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Dyma'r cyd-destun: ...through an uncompromising approach to energy use and taking advantage of new technologies and efficient design, we can reduce energy demand by over fifty percent by 2030 (we call this powering down). At the same time, through the widespread deployment of existing technologies, Britain can re-think how to use its massive renewable energy assets to satisfy this reduced demand (we call this powering up). Unrhyw awgrymiadau, os gwelwch yna dda?