Three-fourths of a lightning bolt's energy is used up in heat - but enough remains to deliver a full 125 million volts of electricity.
(Three-fourths of a lightning bolt's energy; is used up; L:in heat) (enough; remains; to deliver a full 125 million volts of electricity)
Three-fourths of a lightning bolt's energy enough
is used up remains
L:in heat
to deliver a full 125 million volts of electricity