I agree with Flowmom--try appealing to the bank to see if you can make the account a mortgage-only one. (Wouldn't it be possible to pay the hydro another way?) I don't think emailing your H is a good idea--it will just allow him to paint you as controlling in his mind, and when he knows he's upsetting you, it'll probably make him more determined to "get" you through that account.
Don't give up hope on him--people who have not dealt with an MLCer have NO idea how depression can make them into the Incredible Hulk version of themselves. But, at the same time, take care of yourself and live your life as though he wasn't coming back. I'm glad to see you're making the most of this awful time in what you've learned about yourself and about healthy relationships. Way to go, DiamondGirl!