For test run new game in Sandbox mode. 25 lvl researching. One shield - consumption minimum 1.6GW, maximum 4.8GW.

https://drive.google.com/file/d/1uOhxJfFjYD1bQaVeJGJecdY28Am2Fyes/view?usp=sharing
https://drive.google.com/file/d/1tpQEUscVxxHDzJz0qoSDh_LtlMDC6v32/view?usp=sharing
https://drive.google.com/file/d/1ESctSwoled2_epODYZJoqrFUgS2xOamd/view?usp=sharing

I fixed the error by changing the following text in the file prototypes\energy_interfaces.lua (lines 35, 36, 37):

was:

input_flow_limit = recharge + drain .. "kW",
buffer_capacity = capacity .. "kJ",
drain = drain .. "kW",

became:

input_flow_limit = recharge + drain .. "W",
buffer_capacity = capacity .. "J",
drain = drain .. "W",

result:

https://drive.google.com/file/d/1hN_bHCu4WKfnM9ecQFxiWAvTcdodz56Z/view?usp=sharing

First off, that wasn't a bug. The mods were meant to start in the kilowatt ranges and then take off like a Falcon 9 rocket into the gigawatts. Poor design in my opinion, but I do get that the idea was to keep turret shields from being too powerful. The power draw is a balance decision.

Second off, you are posting under the wrong mod. Looking at the screenshots, the tooltip tells us that the mod you are using is "Turret Shields" and not "King's Turret Shields". There is a difference.

To make things confusing for mod users, there are actually at least 3 mods labeled "Turret Shields". They are:
"Turret Shields" by OwnlyMe
"Turret Shields" by Falafelrollo
"King's Turret Shields" by Kingdud (the one this thread is under.

You need to check your mod listings and see which author is on the mod you are using and post there instead.