The Manufacturing Energy Consumption Survey (MECS) is a periodic national sample survey devoted to measuring energy consumption and related issues in the manufacturing sector. The MECS collects data on energy consumption, purchases and expenditures, and related issues and behaviors. Links to previously published documents are given below. Beginning in 1998, reports were only issued electronically. Additional electronic releases are available on the MECS Homepage.

The basic unit of data collection for this survey is the manufacturing establishment. Industries are selected according to definitions found in the North American Industry Classification System (NAICS), which replace the earlier Standard Industrial Classification (SIC) system.