Your Ampz (Voltz for 1.21) (Official Server) server, with the useful bits included.
Host your Ampz (Voltz for 1.21) (Official Server) server
Ampz (Voltz for 1.21) (Official Server) is available for Minecraft server hosting with CreeperHost.
Note! There is an official server button in-game so you can join it without having to type in the ip and such.
Official Wiki:
Ampz is a mod pack built around Minecraft 1.21. It is available both on the Curseforge and on the Technic Launcher. The Ampz modpack consists of various mods that use the Electrodynamics electricity API in addition to several others compatible with it. It intends to be as similar as the original Voltz way back from 1.4.7 as possible.
Bring the world at your knees with missiles, bombs, machinery, and all of the creations you can figure with your mind!
Help us create a new and better version of Voltz for Minecraft 1.21
You should also check out my new Patreon!
Mod List:
Got questions? 
Yes. CreeperHost modpack pages link into ordering with the selected pack ready to install. You can also change versions or pick another supported pack later from CreeperPanel.
CreeperPanel is built around real modded servers, including update paths that aim to preserve user configuration changes where supported instead of treating every update like a fresh install.
Eco can work for lighter packs, but Premium is the recommended CreeperHost range for modded Minecraft. Premium gives stronger hardware, Turbo Start, Bonus Memory, and Ask Theo where enabled.