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Pretty straightforward. Beacons with 2 Efficiency Modules only reduce the power consumption by 50% vs 100%. This is tested on Assembly Machines and Miners. Miners and Assembly Machines were loaded with Productivity Modules and Beacons filled with Speed Modules nearby. So at the example I'm looking at right now, power consumption is at around 880% on the Assembly Machines. I add a Beacon with 2 Efficiency Modules (Combined 100% power reduction) and only receive a 50% reduction (830%).

No mods, pure vanilla freeplay game.

Note: I haven't tested this with lower tier modules.

Not a bug

https://wiki.factorio.com/Beacon wrote:A beacon is a device that transmits module effects to nearby machines, in a 9×9 square. The effects are transmitted at only half efficiency.

Efficiency
50%

So: 2xEM3 in beacon = 1xEM3 on each building in range

Strange. Thanks for the info. Does the "Energy Consumption: -50%" description need to be corrected when placed in a Beacon, then?

When hovering over beacon there is: "Distribution efficiency: 0.5" that is precise enough. 1xEM3 that reduces power by -50% when put into beacon will reduce power of each crafter in range by only -25%

It is no bug. Only half of the modules effect is transmitted.

https://wiki.factorio.com/Beacon
A beacon's effect transmitted is only half of the effect of the modules within. So, two of the same module = one module's worth transmitted.

Same with speed modules.

Thanks guys. Just noticing this. This is what happens after 24 hours straight of Factorio Close thread?