At 250 feet, I'd set a second meter and a seperate service, assuming there
is a line near enough.

Not a good idea in some areas depending on the electrical utility. A
separate service at an outbuilding may be considered "commercial" even
though it's a residential garage. This means you might be paying commercial
rates plus a meter-reading/billing fee each month. In my case, this meant
about $12 a month whether I used any power or not. Much better to keep it on
the residential meter. YMMV