This document compares the energy efficiency provisions in three major pieces of proposed US climate and energy legislation: the American Clean Energy and Security Act (ACES), the American Clean Energy Leadership Act (ACELA), and the American Power Act (APA). It provides details on provisions related to renewable electricity standards, appliance and product efficiency standards, building energy efficiency, federal energy management, transportation, smart grid, industrial and research programs, and more. The longest section details differences in provisions across the bills for appliances, equipment, lighting and product standards.