The most important thing to be prepared is a generator. Its really essential in Maine since its a heavily wooded state with a significant portion of its grid surrounded by trees. If its a whole home setup, its much lower maintenance and worry versus a portable one connected to an interlock or transfer switch, but both setups are perfectly valid to keep a home running for days or even weeks. If you are trying to save money, a portable generator in the 8-10k watt range is generally sufficient. You may be slightly limited in some areas--like you cannot run an electric range, dryer, and hot water heater at once, but you can still live life pretty much normally. If its a portable generator, you also want at least 2 gas cans that can hold 5+ gallons of fuel. And if its available in your area, use non-ethanol gas as its stable for much longer and is a far better option for small gasoline engines.

As for other needs--you should try go have some shelf stable foods like rice, beans, beef/chicken/vegetable stock, canned foods, pastas. A chest freezer with some meats, frozen veggies, and other foods is also good to have. If you are on a private well and have a generator connected to the house, you won't have to worry about water as much, but its always good to have a few gallons of bottled water too. If you have pets, be sure to keep some backup food for them too.

Finally, have plenty of fresh batteries, LED flashlights and lanterns, keep some charged battery packs for phones.

For an extra tip, if you have the money, a UPS (uninterruptable power supply) is very nice to have connected to your internet equipment. There are many times we will lose power for maybe 1-2 hours in a heavy thunderstorm or bigger snowstorm, and even a relitavely inexpensive UPS ($150 or so) will keep your modem and router running for 3-4 hours easily. Its more than enough to let you report the outage to the power company and keep informed about their progress.

I've lived in Maine my whole life. What I find different today versus growing up as a kid is we lose power much less often now than we did as kids, but the severity of the storms that cause widespread outages are much more significant and cause more damage. The biggest storms in my childhood were in 1991 from Hurricane Bob and the Ice Storm of 1998. Both times we lost power for over 2 weeks, as did much of the state. But, it was also common to lose power for a day or two from something as simple as a thunderstorm or some light snow and wind. The difference today is the power companies are doing a better job of keeping trees and branches back from power lines, but, as climate change impacts us, the storms hitting us are more severe causing much more damage to trees due to wildly flucutating temperatures and higher winds. So, I think more storms with widespread damage will continue to increase as things continue to change and it will be even more imporant to handle the aftermath and be prepared.