California Air Resources Board Chair Mary Nichols said last week that the agency will suspend for 18 months enforcement of greenhouse gas emissions trading rules requiring electricity importers to legally attest each year that they have not engaged in resource shuffling. The announcement comes two weeks after a Federal Energy Regulatory commissioner criticized the board for not clearly defining the practice. Under board rules, resource shuffling occurs when an electricity importer delivers renewable or other low-emissions sources of power to California’s grid in lieu of previously contracted carbon-intensive electricity, and then sells the inefficient electricity out of the state.