Most analyses of utility strategies for meeting Title IV requirements in the Clean Air Act Amendments of 1990 have focused on factors relating directly to utilities' sulfur dioxide control costs; however, there are a number of additional environmental requirements that utilities must meet at the same time they comply with the acid rain program. To illuminate the potential synergies and conflicts that these other regulatory mandates may have in connection with the acid rain program, it is necessary to conduct a thorough, simultaneous examination of the various programs. This report (1) reviews the environmental mandates that utilities must plan to meet in the next decade concurrently with those of the acid rain program, (2) evaluates the technologies that utilities may select to meet these requirements, (3) reviews the impacts of public utility regulatioh on the acid rain program, and (4) analyzes the interactions among the various programs for potential synergies and conflicts. Generally, this report finds that the lack of coordination among current and future regulatory programs may result in higher compliance costs than necessary. Failure to take advantage of cost-effective synergies and incremental compliance planning will increase control costs and reduce environmental benefits. SUMMARY The Clean Air Act Amendments of 1990 introduced a broad range of air quality programs that will affect the environmental control programs of electric utility and nonutility generators. Perhaps the most innovative of the new Act's programs is Title IV. Title IV creates a program of tradeable emission allowances for sulfur dioxide (SO 2) in order to reduce utility SO 2 emissions to half of their 1980 levels. Title IV also specifies emission standards for utility emissions of nitrogen oxides (NO x) by boiler type. Title IV is being implemented in two phases. Phase I begins in 1995 and affects the 263 utility units emitting the highest levels of SO2. Phase II begins in 2000 and affects almost every utility fossil-fuel-fired unit. Utilities affected by Title IV have begun implementing SO 2 compliance plans for Phase I. Utilities planning for SO2 compliance are considering the relative fuel, technology, and allowance costs in their planning calculations. In addition, utilities must consider many other existing and potential environmental regulations and requirements. These regulations include the following: • Title IV controls of NOx, • Title I controls of NO x, • Potential Title III controls of hazardous air pollutants, • Potential carbon dioxide measurement and control requirements, • New source requirements, • Revisions and requirements for prevention of significant deterioration and for best available control technology, and • Regulation of solid and aqueous wastes. Ideally, utilities will choose compliance strategies that minimize total environmental compliance costs while maintaining system reliability. Certain control options and strategies can reduce two or more pollutants at a lower cost than separate controls for each of t...