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Read https://hive.blog/faq.html
If you power down your Hive Power, that will get converted to HIVE over 13 weeks.

Okay thanks bro

hi @mahdiyari
i want to ask, what happens if i power down all power hives i have? can i still post, vote or comment?

Hive Power gives your votes the value and also gives you RC. RC is used when posting, voting, or any other action.
https://hiveblocks.com/@galih.amenk
You can see your RC (Resource Credits) there.
You can vote or comment without Hive Power but not so much. Maybe 1 comment per day.

how did the show change the power hive to HBD/HIVE?

It takes 13 weeks to power down all of your HP. You get 1/13 of it per week.
Hive Power converts into Hive.

do you think it's worth it if I power down all the power hives I have?

If you don't need the money, keep it powered up.
It can help your account grow.