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Can slicing a 100-mile trench into the bed of the Columbia River be good for the environment? The answer is a big yes, says a team of energy developers that proposes submerging power cables in the riverbed. The developers say the cables could deliver “clean’’ energy that will be crucial for getting the most densely developed areas of the Pacific Northwest off fossil fuels. A proposal by energy developer Sun2o Partners and transmission developer PowerBridge would insert the cables into the Columbia at The Dalles in Oregon. This electrical on-ra...