There was no such idea at the Compendium so:
Quantumcrystals are a extremely rare (only one placed every 50-100 16 Chunks and every layer is possible) kind of Crystal that is capable of generating Energy. These Crystals are generating fluctuating 16 32 EU/t all the time (that's not much for that extreme rareness).
To use that energy you need a Quantumcrystalreactor:
where the Energycrystals are Lapotrons (Icon missing!).
Only one slot in the GUI for the Crystal (No Batteryslot because of the fluctuation). You can put the Crystal everytime out of the machine (for selling it for example).
if you put a Quantumcrystal into that Tier-4-Technology you get your average 16 32 EU/t at a fluctuating rate between 0 and 64.
But you must be carefull, sometimes it generates Energyspikes (after a long period of low energygeneration) from up to 2048 EU, so it is not good usable to power a few Tier-1-Machines in a newly build Base (Except you have Transformerupgrades or a full set of Transformers). Also you MUST use the Energy outputted by that generator, because if not it goes overload and BOOM! The two Lapotrons are the Overloadbuffer for 2 Mill EU. The Quantumcrystal itself is 100% explosionsave, if it its not in a Quantumcrystalreactor.
Because of the rareness of these Crystals they are very good for people, who are going out for mining instead of UUM-Producing their needed stuff, so they can sell them for a horrendous price. In the Nether you can find more of these Crystals (one placed every 25-50 10 Chunks at every layer), and in the End you can find much more of them (one every 4 2 chunks).
This Crystal is especially NOT useable in the Quantumsuitrecipe for infinite Quantumsuitpower (Just before you're asking for).
Firstedit: Quantumcrystals are also NOT produceable! (not even with UUM)
Doubleedit: 100 Chunks are NOT 1600m*1600m, they're only 160m*160m!
Tripleedit: It would replace 32 64 lagging Solarpanels (or even more with bad weather), and can be placed underearth and in other dimensions!!!
Quadroedit: Solarpanels effective EU/t is under 0.5 (only day not night or bad weather) and One every 16 chunks with average 32 EU/t is better.
I thought a lot about the Balancing and the risks Quantumenergy could have to the User (and his Neighbours), so what's your opinion?
Edit: So after some discussions we got the following:
Quantumcrystals, mainelement of Quantumenergygeneration, which is not produceable (even not with UUM). 
Despite the name, it has absolutely nothing to do with Quantumsuit.
Quantumreactor costs 4 Iridiumplates and other stuff mentioned above.
One Crystal every 16 - 32 Chunks (ca. every 90mx90m-Square) and possible at every heightlayer (even in Mountains).
32 green EU/t forever per setup. 
It's a very late Endgameenergysource.
It's generating Energyspikes from up to 2048 EU after long periods of low energyoutput. 
If you overload the internal EU-Storage of 2-million from the Generator it goes BOOM like nuclear. 
You need at least one HV-Transformer for running it safely. 
If you use a Minersetup than an OD-Scanner will not work, but the OV-Scanner can detect 'em.
Gives a good reason for Mining (instead of UUM-Producing the stuff you need). 
A new reason for going to the Nether (crystals a bit more common there). 
A good reason to go fast to the End, because there are much more (First player who reaches it is getting most of them). 
Most likely no more massive Solarpanels (One replaces a bit more than 64 Solarpanels -> less lag). 
In old maps/servers you have to discover new terrain in order to get these Crystals. 
With so much energy in Endgame would be a blastresistent Iridiumblock a good way to dump UUM. 
If you think that producing so many EU for Iridum, only to get only even more EU, destorys the fun, than look at what you're actually doing with nuclear or whatever energysource. Hint: It's exactly the same, but only with a lower Tier and less fun, than Quantumenergy.
Did i forgot something?
