The energy service company (ESCO) industry in the United States follows a modest revenue growth trajectory generated by the business of implementing comprehensive facility upgrades. There is a foundation of ESCO work in the public sector that is supported by policy and economic drivers. The challenge for industry, however, is to attain more aggressive growth in this mature marketplace. Long-term market expansion is expected to arise from new business in the private sector and through the development of opportunities in markets outside of the United States. The private sector represents a significant volume of market potential for ESCOs. A new wave of companies is opening the door to commercial sector energy efficiency with business models that help private sector customers overcome the upfront capital hurdle to investment. Meanwhile, Europe is expected to be the first key international market for the largest U.S. ESCOs. Although ESC's have faced obstacles in developing markets outside the United States, a tipping point is nearing and momentum is expected in the mid- and long-term. According to Navigant Research, the U.S. ESCO market is expected grow from $6.3 billion in 2015 to $11.5 billion in 2024, while ESCO revenue in Europe is projected to grow from $2.7 billion to $3.1 billion. This Navigant Research report assesses the ESCO market for energy performance contracts (EPCs). These projects include retrofits for lighting, heating, ventilation, and air conditioning (HVAC) and mechanical systems, renewables, water conservation, commercial building automation systems (CBASs), and building energy management systems (BEMSs). The report details the current state of the ESCO market and provides insight into its future direction based on customer demand, government policies, and other market dynamics. Forecasts for the U.S. ESCO market, segmented by customer type and technology, extend through 2024. The report also provides a top-line forecast through 2024 for ESCO revenue in Europe, with a focus on Germany, France, and the United Kingdom.