We switched to washables last December for DD who is only now in night nappies as I couldn't stand throwing away any more disposables, especially now they are just full of wee.
However just having received our energy bill for the quarter I am horrified! Our electricity usage has doubled from the usual, at an additional cost of £135!! Now I'd expect our gas to fluctuate through the year for the central heating, and yes I suppose we do have the lights on more in Jan-Mar but not double. There is nothing else that changes seasonally that I can blame it on, so it must be laundering the nappies.
My dilemma is that as we only expected to use them for 6-12 months at night I didn't want to buy lots of nappies so I have 4-5 nappies and booster. I wash after 3 days or they smell too much (drypailed). I was getting such an ammonia whiff that I took advice of MN and do a cold pre-rinse on a 1/2 load setting. I then wash at 60 deg and often I don't have anything else to throw in as we don't have many whites or things that need washing hot. My machine hardly uses any water so I don't do the economy thing for the wash as I want them to wash properly. I have probably tumble-dried once a fortnight as we have such hard water in London they end up so hard if I don't and now and then I have just been too disorganised to wait for them to dry without.
But I am so shocked at the cost in terms of the energy (and carbon inevitably) that I'm questioning this strategy. Maybe it's all the drier, being a washer drier I'm sure it's horribly inefficient (and I do use those dryer balls). Has anyone else been shocked at the true cost of washing nappies?