National Energy Modeling System
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The National Energy Modeling System (NEMS) is energy-economy computer model of United States energy markets created at the US Department of Energy, Energy Information Administration. NEMS projects the production, consumption, conversion, import, and pricing of energy. The model relies on assumptions for economic variables, including world energy market interactions, resource availability, which influences costs, technological choice and characteristics, and demographics. (1)
Design
The primary use for NEMS is to produce the Annual Energy Outlook, published on the EIA website in the early months of each year.(2) NEMS is maintained by the EIA Office of Integrated Analysis and Forecasting and was first used for AEO projections in 1994.(1)
The model contains several modules which interact as part of the equilibrium calculations for long-term forecasting. These modules are as follows:
a. The Integrating Module
b. The Macroeconomic Activity Module
c. The Transportation Sector Module
d. The Residential Sector Module
e. The Industrial Sector Module
f. The Commercial Sector Module
g. The Coal Market Module
h. The Electricity Market Module
i. The Petroleum Market Module
j. The Oil and Gas Supply Module
k. The Renewable Fuels Module
l. The International Energy Activity Module
NEMS includes a variety of energy sources used for fuel purposes (heat and power) and feedstock purposes. The primary energy sources of NEMS are Coal, Natural Gas, Distillate Oil (Diesel), Residual Oil, Liquid Petro Gas, COke, Renewables (primarily biomass and wind), Motor Gasoline, Electricity, Petrochemical Feedstocks/Intermediates, Steam, and Asphalt/Road Oil.
Projections from NEMS are given at the nine census division level, the four census region level, and the national level.
References
(1) USDOE-EIA, NEMS Model Documentation, http://tonto.eia.doe.gov/reports/reports_kindD.asp?type=model%20documentation (2) USDOE-EIA, Current AEO Homepage, http://www.eia.doe.gov/oiaf/aeo/index.html