Leave it idle. For every thousand dollars of energy extra used you will earn one cent worth of bitcoin and the denomination of bitcoin will be so small you wont be able to spend it. Regular computer mining bitcoin died a long time ago. Leave it alone.
This assumes that he needs to pay for his own electricity, which is not necessarily true. It is hypothetically possible that the OP works for some company when his job is to oversee a large number of servers that happen to be idle (although the ethics of mining with your company's equipment is questionable).
The OP could also potentially "mine" bitcoin via mining various altcoins via a multi pool that mines scrypt or x-11 coins that would be substantially more profitable on an electric basis