I don't know about energy costs, but I had a stackable washer/dryer in my old apartment. I could do a small load in each. Electricity was included in my rent so I don't know how much water/power it used. I could do a set of queen sheets, or 2-3 large towels, or a few shirts, shorts, etc. I didn't live there long enough to have to do jeans or sweatshirts!
I have these in my apartment. My electricity bill is around $50 a month but I often run an air conditioner/fan daily too. My water bill is $20-25 a month. I've managed to wash/dry my queen size comforter.
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