I only know what I've read. Originally, we were able stack/buffer power above 125 via +weapon power consoles, batteries, and skills such as EPtW and EPS Power Transfer. This would allow for example, an 8-beam shot sequence of 125,125,125,125,115,105,95,85 as opposed to 125,115,105,95,85,75,65,55 when you didn't have any stacked/buffered power. But supposedly, Cryptic eliminated the ability to stack/buffer power above 125 by setting the absolute hard-cap to 125. Furthermore, along with this change Cryptic also supposedly implemented instant power recovery for weapons fire, meaning EPS consoles should no longer be necessary to gain all your power back for the next firing cycle.

Everyone is confused because there is what we have been told -- the above -- and then what actually happens in-game. I know for a fact weapon power is not always being totally recovered before the next firing cycle. If I'm firing 4 beams continuously and have my weapon power at 125, the weapon volleys should be 125, 115, 105, 95... 125, 115, 105, 95... 125, 115, 105, 95... repeatedly, never dropping below 95. But this is not what happens when you watch your power levels. Weapon power consistently drops below 95 before returning to 125, which should not be possible if things worked as advertised.

Also, there have been mixed reports on whether or not stacking/buffering power above 125 still works. I have not done any extensive testing, but from my experience using +weapon power consoles to go above 125 does not work. +Weapon Power skills and Batteries might work in some capacity or even to full effect, I don't know, but I cannot really say. When the patch notes for -- the above -- were released I took them on face value and changed my builds to not stack power. PvE, stacking/buffering weapon power doesn't really matter, so even though I noticed weapon power recovery was not working as advertised, and thus put an EPS console back in my build, I never explored the weapon power stacking. I probably should with all the reports of it still working, especially if I ever get into PvP.