Power

is the main currency of bloble.io, it's used to buy Towers and Upgrades for them,  will automatically be generated at one unit per second, buy Generators to earn even more.

It's also good to know that once you hit the limit of 6000, your Generators will stop working until you spend it. When you sell anything, you'll get half of what you paid for or half of the upgrade, not both.

Tips

 * Since you need to buy stuff, spend it on Generators and then upgrades them to Power Plants, you earn lots of  and be able to quickly build your Fort.
 * Once you're done building your Fort, you might replace your Generators with Houses, but you won't be able to make repairs to your Fort if you get attacked, making you vulnerable. You also can't afford a Commander without Generators, so please keep them.
 * You don't need a ton of Generators, there are more important things in this game then.