Well energy breack happens when, your oponent completle drains your energy( the blue bar under the health).
The energy drain comes fron all energy wepons, usualy wepons that have a blue glow around them.
To counter this effect you must put in energy modules on your mech. Either energy engines, energy regeneration, or energy storage. This will increase your max energy capacity and/or energy regeneration( at the end of your turn).
But the most effective way to counter is the use of energy free wepons(wepons/drones that do not need energy to fire).
Here are some examples of wepons that dont use energy:
Phisical wepons: Ironback, boomstick, for low lvl.
Anihilation, purifier, mercy for high lvl.
All phisical drones use energy!
Heat wepons: shotgun( dont know the name, but it is a shotgun with a red glow around it) for low lvl.
Sorow,rekoning, magma blast, for high lvls.
Most heat drones don't use energy.
Need any more help, pm me.
And we get you a nice build, what is your lvl and rank?