My suggestion is to make pumps feed water inside water mills [4 at a time] (like placing buckets into it)
X = Anything
P = Pump
W = Water mill
A screen of how a 3x3 water tower generator (only 4 water mills)
This would make each water mill output 2 EU/t for a total 7EU/t [considering pump 1EU/t energy usage]
This can be a way to make water mills more competitive to solar and wind generators.