1. (1) DOER, in consultation with the Department, shall select from 225 CMR 13.08: List A the categories of bidders eligible to participate in each auction, provided, however, that owners of CO budget units located in Massachusetts (MA CO budget units) shall be eligible to participate 2 2 in all auctions.

List A: Categories of bidders:

Category No. 1: Owners of CO budget units located in Massachusetts. 2

Category No. 2: Owners of CO budget units located outside of the Commonwealth but 2 within those states that have final CO budget trading rules in place at the time of the auction 2 and are RGGI Participating States.

Category No. 3: Other market participants including, but not limited to:

1. (a) owners of fossil-fuel-fired generation units located outside the participating states;
2. (b) brokers;
3. (c) environmental groups;
4. (d) financial and investment institutions;
5. (e) generators that do not emit CO or do emit CO but are not subject to the CO 2 2 2 Budget trading program in Massachusetts or a Participating State.

1. (2) DOER may modify the categories of participants as it deems necessary.