This is a bizarre comparison. The problem with the oil spill isn't the lost energy, it's the destruction and the cost of clean-up. The implication of this article is that retrofitting 75k homes somehow cancels out or equals an oil spill. At best, this amount of retrofitting reduces the risk of an oil spill slightly because one fewer rig would be built. When a carpenter drops a beam on his foot, we can't say that the…
The comparison isn't really trying to do that though. I think the point is to compare "oil spill economics" with energy efficiency economics.
That we have the rig in the first place is the issue...