As the prime contractor to the CPUC, Aspen managed the environmental economic analyses of more than 27 subcontractor firms in completing a Draft EIR in November 2000 on PG&E Co.'s proposed auction of its hydroelectric system. The Draft EIR analyzes the range of operational changes that could occur under new ownership, including complex integrated models that analyze power generation and water management. Aspen prepared the air quality section for the Divestiture of PG&E's Hydroelectric Assets Draft EIR/EIS for the CPUC. The air quality analysis included the determination of potential construction and operating emissions for future land uses (forestry, residential, commercial, mining, etc.), and the secondary fossil fuel power plant emissions associated with changes in power output from the hydroelectric facilities for two separate post divestiture operating scenarios.