What is the change in an electron's potential energy when the electron moves from the ground to the cloud?

During a particular thunderstorm, the electric potential between a cloud and the ground is Vcloud - Vground = 1.5 x 108 V, with the cloud being at the higher potential. What is the change in an electron's potential energy when the electron moves from the ground to the cloud?What is the change in an electron's potential energy when the electron moves from the ground to the cloud?
We have potential energy U = potential (V) * charge (q)



So U = V*q = 1.5x10^8V*(-1.60x10^-19C) = -2.4x10^-11 J