Do you know how much electricity you use on a monthly or yearly basis? This will be shown on your electricity bill. Your community solar provider should tell you how much of that total energy will now be coming from solar. It could be anywhere up to 200% of the total energy you use on a yearly basis. In most cases, subscribers will be best off by making sure they only subscribe for up to 100% of their total energy usage. Any energy you buy above 100% will get paid back to you at the end of the year by the energy company, but probably at a lower rate than what you originally paid for it.