As a result, the equivalent percentage of Welsh electricity consumption met by renewable electricity generation reduced slightly from 56% in 2020 to 55% in 2021.
O ganlyniad, bu mymryn o ostyngiad yng nghanran gyfatebol y trydan a ddefnyddir yng Nghymru drwy gynhyrchu trydan adnewyddadwy o 56% yn 2020 i 55% yn 2021.