Reuters: Southern California Edison will not be able to pass on to its customers up to $30 million in costs to join a study of whether petroleum coke, an oil refinery byproduct, can be turned into a clean, low-carbon fuel for power plants. But the electric power supplier might be able to be compensated later. Southern California Edison wants to join a study by a joint venture of BP Plc and Rio Tinto — global oil and mining giants, respectively — but California’s utility regulator said …