Hi John,
Can you ask yourself, if my power went off for three to four weeks at the office right now, is there anything there, I’d need to be working.
The reason I say this is if you have computers, fridges, communications equipment etc at your offices that you need to keep powered then “ticking over” might be needed. If none of that applies, have you considered a temporary disconnection, some power retailers depending on your office set up, have the ability with “smart meters” to disconnect power to a meter remotely and then turn it back on when you need it. They might try and charge you to do a remote disconnection, but you should negotiate, this is after all unprecedented times and in your case you could be wasting power that could be used somewhere else.