Aspects of the disclosure are directed to a metal only cell-based power grid (PG) architecture. In accordance with one aspect, the power gird (PG) architecture includes a cell building block structure with a N×M grid configuration including N cell building blocks arranged in a first direction and M cell building blocks arranged in a second direction, wherein the first direction and the second direction are orthogonal to one another; and a plurality of power grid (PG) cells, wherein each of the N cell building blocks and each of the M cell building blocks are occupied by a PG cell of the plurality of PG cells.