Power distribution networks (PDNs) using hybrid grid and pillar arrangements are disclosed. In particular, a process for designing an integrated circuit (IC) considers various design criteria when placing and routing the PDN for the IC. Exemplary design criteria include switching frequencies, current densities, and decoupling capacitance and their impact on temperature. In areas of high localized temperature, a power grid structure is used. In other areas, shared metal track pillars may be used. By mixing power grids with pillars, the IC may reduce local hotspots by allowing the grid to help dissipate heat and assist with decoupling capacitance while at the same time providing pillars in areas of high current density to reduce resistive losses.