An electrical connector includes an insulative housing and a plurality of power contact pairs. The insulative housing has a plurality of contact-receiving passageways extending along a front-and-back direction. The power contact pairs are mounted in the corresponding contact-receiving passageways and divided into two opposite rows in a height direction according to contacting portions. Each power contact pair in each row has a first power contact and a second power contact, each one of the first power contact and the second power contact defines a flaky retaining portion held in the relative contact-receiving passageway and a number of contacting portions extending forwards from a front end of the retaining portion. A gap is formed between two adjacent contacting portions of the first power contact, and at least a part of one contacting portion of the second power contact extends through the gap of the first power contact.