Here's what I've got (there's a little more, including installation costs but I think the game handles that by itself):
Format: Level: Damage / Cost (credits) / Poweruse
14: 131 / 5.3M / 1.9GW
15: 170 / 10.6M / 3.5GW
16: 221 / 21.3M / 6.3GW
17: 287 / 42.2M / 11GW
18: 373 / 85.2M / 20GW
19: 485 / 170M / 36GW
20: 631 / 341M / 66GW
21: 820 / 682M / 120GW
22: 1,066 / 1.4B/ 215GW
23: 1,386 / 2.7B/ 385GW
24: 1,802 / 5.5B / 700GW
