With the completion of the solar PV array install, the HERS rating for the Good Energy Haus was amended and now shows a score of -8. Traditionally, we find that Passive House buildings do not rate at their actual performance due to some perceived short comings of the modeling protocol used to create a HERS rating. However, seeing this home go negative is an indicator that the general trajectory is now correct. Onward to Carbon-Neutrality.