Recent studies have shown that the Internet-related energy consumption represents a significant, and increasing, part of the overall energy consumption of our society. Therefore, it is extremely important to look for energy-efficient Internet applications and protocols. The largest contribution to this energy consumption is due to Internet edge devices (PCs and data centers). As a particularly significant example, in this paper we address the fact that users leave their PCs continuously powered on for satisfying connectivity requirements of Peer-toPeer (P2P) file sharing applications, like BitTorrent (currently the most popular P2P Internet platform). To reduce these energy consumptions, without penalizing the Quality of Service of BitTorrent users, in this paper