Another colour for chart of 2 values

i have a solar equipment and i make a chart with two different values:

  1. the production of solar power
  2. the actual power consumption of my house

I want now in the chart where the solar production is higher then my actual consumption that this area will be coloured in a third colour because this shows me that i dont need power from the network and i give power to the network.
Is this possible ?

Has nobody any idea on this?