phase 1 summary objectives and approach the main of this study are to analyse energy demand supply situations in thailand during period 1995 2025 assist thai government preparing plan for future development updating conservation a techno economic is selected forecasting three different long term macroeconomics scenarios called base high low have been developed scenario uses growth targets 1997 2001 which average 0 annually use same assumptions nesdb but make beyond forecast 5 sectors comprising industry transport commercial residential agriculture considered separately on common projection demographic macroeconomic ie with each environment two business as usual evaluated sector regarding least cost employed analyze