assumptions to the annual energy outlook 1998 december 1997 information administration office of integrated analysis and forecasting us department washington dc 20585 introduction 3 macroeconomic activity module 14 international 16 household expenditures 20 residential demand 19 commercial 27 industrial 37 transportation 45 electricity market 65 oil gas supply 80 natural transmission distribution 88 petroleum 93 coal 102 renewable fuels 108 list acronyms 117 2 contents t his paper presents major national modeling system nems used generate projections in 1 aeo98 including general features model structure concerning markets key input data parameters that are most significant formulating results detailed documentation is available a series reports synopsis components interrelationships modules presented an overview