The call-offs will be offered in two Lot types, under 1,000 premises and over 1,000 premises, to stimulate interest from a broad range of potential suppliers.
Bydd y galwadau yn cael eu cynnig mewn dau fath o Lot, o dan 1,000 o adeiladau a dros 1,000 o adeiladau, i ennyn diddordeb gan ystod eang o ddarpar gyflenwyr.