Abstract: A power apparatus (100) comprises one or more backplanes (101) and removably engageable power modules (302). Each backplane (101) comprises a plurality of slots (102) and each slot (102) is adapted to engage with a corresponding removably engageable power module (302). Each backplane (101) further comprises a bus (104) coupled between each of the slots (102) and at least two said power modules (302) removably engageable with corresponding ones of the slots (102). The power modules (302), which are engaged with the corresponding slots (102), communicate and distribute power with one another via the bus (104).