Get hit by lightning

30 per damage Electromagnetic Storm only. One, two, and three stars: 34, 67, and 100.

This scores during Electromagnetic Storm. Points are 30 for each point of health the bolt removes.
Stand in the center of the strike. The edge deals less damage and scores less.
Do not wear a shield. A shield reduces the health you lose, so it reduces the score, and it breaks.
The wiki treats a direct hit as 60 damage. Heal before the next bolt. Standing on another Raider can stack two bolts and down you.
Its direct-hit table lists 1,800 with no shield, 1,080 with a light shield, 1,020 with a medium shield, and 840 with a heavy shield. Medium and heavy are rounded down before the multiply.