Minnesota regulators are examining options for allocating greenhouse gas allowances as part of a potential strategy to comply with EPA's GHG rule for existing power plants by trading credits with other states, an effort that could eventually result in a plan to link with the Northeast's Regional Greenhouse Gas Initiative (RGGI), sources say. The state is leaning toward a pursuing a “mass-based” compliance strategy, with trading as a key component, to comply the EPA's existing source performance standards (ESPS), according...