The energy would be equivalent to greater than the KE of the three planets combined.
KE = 1/2m x v^2
m = mass in kg
v = velocity in m/s
If we assume exact Earth conditions as in RIGHT NOW (not in the gravitational pull of some other planet like object at close range, as that would severely alter results), we have a velocity equivalent to
30000 m/s (roughly) and a mass equivalent to 5.972e24 kg.
KE = (0.5 x 5.972e24) x 30000^2 = 2.688e33 Joules
Multiply by three to get a net value of 8.063e33 Joules, or 1.93 Yottatons of TNT,
Planet level+.
Hope this helped.