We have had our solar power system for three months now, and in that quarter, we have generated a smidge over 2000kWh, or 2MWh. That sounds a lot!
Drax power station generates 24 TWh per year, which would have been 6TWh during the same quarter. So we are 300 nanoDrax-equivalent (or Drax is 3Mega-house-equivalent), which rather puts things in perspective.
However, over that same quarter (again according to Wikipedia), Drax would have produced 5.7Mtonnes of CO2 and 0.375Mtonnes of ash. Our system, on the other hand, produced no CO2 and no ash: not even a femtoDrax.