(Portland, OR)  --  The Portland City Council is considering a proposal to require a Home Energy Score whenever a house is sold in the city.  The score would help buyers have a sense of what their heating and electricity bills would be.  Under the proposal, the seller would have to pay a certified contractor to do a home visit and rate it on a scale of one to ten.  The Portland Metropolitan Association of Realtors opposes the proposal, calling such a mandate "unnecessary, costly and intrusive."