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Agree with JT. Check your meter and see that it matches your bill. Also, it could be that the earlier bill was a low guesstimate and the current bill has an actual reading bringing things correctly up to date. That was the explanation of my mother’s higher than expected gas bill.
Also, depending on what you use electricity for, there might really be a big seasonal difference.
Back to the solar question: One more option to consider, though more complex than the OC simply attaching PV to its own circuit to offset its own common property electricity consumption. Some places have installed so much PV generation that they can supply from the common property to individual lots through a more complex billing arrangement. Search through ReNew Economy and One Step Off the Grid sites as well as Green Strata for examples.
BTW Are the meters in the basement also where the car parking is? If so, another thing to think about is having cabling from each lot’s meter to its parking space with an ordinary 15A outlet. That would enable the lot owners to get a plug-in EV or hybrid at any time and greatly simplify billing. It would just automatically go to each lot’s electricity account. The lot owners would then have an incentive to opt for time of use metering which would have the EV charging shifted off the evening peak.