Although energy development ultimately produces some additional tax revenues, these revenues are usually much lower during early development stages than after the energy-producing operation begins, thus creating an early shortrun imbalance between government revenues and expenditures. State and federal loans, impact aid for operating expenses, and grants ease such financial problems. This study describes the front-end problems which will accompany coal development and electric generating plant construction in the Northern Great Plains. The ENERGYTAX simulation model is used to obtain timepaths for new state and local government revenues from energy projects typical of those being developed in the region. Separate estimates of new revenues from a 5-million ton per year coal mine, an 801-megawatt electric generating plant, and the combination of the two are provided for locations in Montana, North Dakota, and Wyoming. Revenues for each year of construction and start-up and for the new projects' first 5 years of operation are shown for the state, school district, city, and county governments in each state. Tax and aid systems differ considerably among these states, so the individual revenue paths illustrated provide useful insights into the advantages and disadvantages of various taxes and aids during periods of rapid growth. (Author/BRR)