World Energy Projection system is an old model that Department of Energy, US once used for some of their projections. It looks like more of an accountant's balance sheets, but you can download and check the validity of the model for fun, it will be a good exercise.
Model can be downloaded from here and documentation is here. In the document you can find the relevant informations about using the files.
"The World Energy Projection System (WEPS) was developed by the Office of Integrated Analysis and Forecasting within the Energy Information Administration (EIA), the independent statistical and analytical agency of the U.S. Department of Energy. WEPS is an integrated set of personal computer-based spreadsheets containing data compilations, assumption specifications, descriptive analysis procedures, and projection models. The WEPS accounting framework incorporates projections from independently documented models and assumptions about the future energy intensity of economic activity (ratios of total energy consumption divided by gross domestic product [GDP]), and about the rate of incremental energy requirements met by natural gas, coal, and renewable energy sources (hydroelectricity, geothermal, solar, wind, biomass, and other renewable resources). Projections produced by WEPS are published in the annual report, International Energy Outlook."
http://www.eia.doe.gov/oiaf/ieo/weps/Doc:
http://tonto.eia.doe.gov/FTPROOT/modeldoc/m05097.pdf
Also, 2010 gas figures can be found:
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