; (2) the opportunities for additional technologies and sources of efficiency and renewable electricity that have emerged since the date of enactment of this Act; (3) the impact of the programs on the reliability of electricity and natural gas supply; (4) the net benefits or costs of the programs to the United States and the States, including— (A) the effects on electricity and natural gas demand and prices; (B) the economic development benefits of investment; (C) environmental costs and benefits; (D) the impacts on public health and health care costs; and (E) avoided costs related to environmental and congestion mitigation investments that otherwise would have been required; (5) an assessment of the benefits and costs of increasing the performance standards established under section 611(d) of the Public Utility Regulatory Policies Act of 1978 (as added by this Act); (6) the feasibility, advantages, and disadvantages of alternative models for demonstrating compliance with a Federal energy efficiency resource standard, including— (A) establishing a national trading system for energy efficiency credits; or (B) demonstrating compliance through actual reductions in delivery or sales of electricity and natural gas, rather than on program savings