Installed solar panels and have sold the carbon credits to offset the cost of the installation. Is the sale of the carbon credits taxable?

Carbon Solutions Group says they were advised they do not have to send out 1099-misc but won't commit to whether or not these sales of carbon credits are taxable or not.  In our case, we are not profiting off the solar installation, so the credit should just be offsetting the cost.   But should we include the sale as part of our income?