A streamer and a DAC shouldn't double an electric bill, unless your bill was $1/ month to begin with.
My 80wpc tube amp only costs about $3/month to run daily.
There's probably something else drawing power such as your A/C, faulty refrigerator(s), etc. If your A/C is low on refrigerant due to a leak, it will run constantly, trying to keep up, costing $$$.
I'd look elsewhere for issues with the bill.