at OP.....well I have bought  energy and largly why I am at 90K  (actually low for my account)

But saying that  my energy grows everyday in raid with out purchasing anything

I do my dailys . I play content that does not require energy (and their is alot of it)

and I buy energy in  TTA and clan shop when available...

I never WASTE energy as well. I do not run dungeons  because I can. I only do energy content when it gets  me something valuable in return

Energy replenishes every 6.5 hours.  Do you log in several times a day to take advantage of this resource?

1 energy replenishes every 3 minutes.

perhaps Closedpoly is refering to if you had  the max allowable energy at lvl 100 and were  empty that it would fully replentish in 6.5 hrs?

Must be 

If you're out of energy, you're probably playing the game well. You'll learn techniques to avoid burning refills and stuff in your mailbox.

A great example is the Daily Quest Refill from the 5x Arena Battles. Don't burn that as soon as you get it, do the Tag Arena and then Faction Wars, as well as Doom Tower and Clan Boss keys first. There's usually another 50 waiting for you in the Advanced Quests plus ANOTHER Refill for doing all the advanced quests.

Only pop refills when you're about to run a dungeon a bunch and learn which ones get sent to your mailbox and which ones immediately pop when you collect them.

Over time you'll get a decent routine of when you are and aren't using energy. 

Lastly, you'll personally need to decide when buying pots with gems is worth it. Some folk never do and spend them all on Scrolls and Ancient Shards. BUT for Scrolls, the energy cost to run Minotaur via gems is less than the purchase of Scrolls with Gems. However the TIME you save is important too. If you can run Minotaur overnight while you're sleeping, that would be best

130 energy x 3 minutes = 390 minutes.  That is 6.5 hours, I believe.  

Early game I set an alarm to login 3 times a day.  Now, I get so much energy for free, I dont need to do it.  

It is, but I was thinking you meant it only comes in as one block of 130 every 6.5 hours.