Let's say that someone (perhaps DoE) identified that the power grid was at risk of attack. Convincing a bunch of people (politicians) to spend a chunk of change to secure it would be betweeen difficult and impossible. In order to further their cause, they can stage these trivial looking attacks to attract funding to grid security.
In computers, hiring pen testers is a common way to get security funded. An attack is a sure fire way to get something funded.