A federal appeals court dealt a blow to electricity-conservation efforts on Friday when it struck down a rule allowing big energy consumers to reap special payments in exchange for cutting their power use. The D.C. Circuit Court of Appeals nullified a 2011 order by the Federal Energy Regulatory Commission that promoted paying businesses to reduce electricity consumption during heavy times of demand. The court ruled that as a federal regulator FERC had gone too far, encroaching in retail electricity markets that are under the exclusive jurisdiction of states. The FERC order was considered integral to federal efforts to curb carbon emissions from power plants and support energy-efficiency investments by big consumers, from grocery store chains to aluminum manufacturers. But electricity suppliers struggling against low power prices and lackluster demand said those payments had become excessive. The Electric Power Supply Association filed the lawsuit on behalf of power generators that […]