Where schemes are still at the development stage, the economic, social, and environmental considerations will be tested as part of the process of identifying the preferred solution.
Pan fo prosiectau'n dal wrthi'n cael eu datblygu, bydd yr ystyriaethau economaidd, cymdeithasol ac amgylcheddol yn cael eu profi fel rhan o'r broses o ganfod yr ateb gorau.