Energysage would not be helpful if you wanted to see an accurate estimation of your savings with solar. Their are significantly more accurate and informative estimators online that you can use for free.

Energysage could be one resource for researching reviews on local installers, but it’s important to find reviews from multiple sources. Companies can choose to focus on a select few online review platforms to attempt to boost their ratings. A good company would have a positive rating among several different review platforms.

Finding NABCEP certified solar installers is an unbiased way to making sure the company you choose is a high quality installer. Having a NABCEP certification doesn’t automatically make your company perfect or immune to wrongdoing. However, this certification is a symbol that the company is going the extra mile to provide quality service.

The details of the program you're describing are vague. However, this is either a solar lease or PPA, both of which are rarely advantageous for the homeowner (with some exceptions).

If you're interested in solar I would recommend purchasing or financing solar. I would also recommend doing more research on reputable solar installers in your area.

I built a solar calculator that will show you a complete financial analysis for solar that is based on the weather in your area and your exact utility rate. I made a version of this calculator that doesn't require any personal information from you other than your zip code (for the weather data). I won't post the link here as I assume that I can't promote the company I work for. However, if you're interested in getting a better understanding of whether or not solar makes financial sense for you DM me and I will send you the link.

I will add that some times when you have a low electric bill it can make it more difficult for solar to make sense for you depending on the cost of the system. It's important to find the sweet spot of cost such that you can estimate a positive net present value after factoring in incentives and savings.