This bill mandates that Transmission Organizations allow aggregators of retail customers to participate in organized wholesale electric markets. This participation involves submitting bids that aggregate the demand flexibility of customers served by utilities distributing over 4,000,000 megawatt-hours annually. The legislation explicitly overrides any existing State law or commission prohibition that might otherwise prevent such aggregators from bidding into these markets. To ensure implementation, the Federal Energy Regulatory Commission (FERC) is required to issue a comprehensive rule within one year of the Act's enactment to carry out these provisions.