Install a sense device in your panel. https://sense.com/

This will give you very detailed data on kWh usage down to the minute. It will also be able to detect things that are using a lot of power. Start there to reduce your bill… shut things off if you can.

Secondly this device will give you enough data to know if TOU plans will save you meaningful amounts of money and it will give you the data you need to provide to a solar company. CMP rates for the various plans are all published online. Make a spreadsheet of your own and calculate the bill or use the effciency maine website calculator once you know your kWh usage and the time of day you are using power. If you have a heat pump you also can get a special rate, you might want a second sense or another device to monitor only your heat pump circuit as they are variable and hard for the sense to pick up when it’s monitoring your main supply only.

https://www.efficiencymaine.com/cmp-rate-calculator/