Well wja69, I regret you are a victim of the mean and cruel utility company. However, as you are planning on running a coin laundry, there are a host of places energy can be recovered.
Now IF ... I were running a coin laundry and THOUGHT I may save some energy, I'd look where I can plainly see energy going out the building ... probably the hot dryer exhaust. I expect one could use a heat pump to transfer the heat FROM the water going down the drain into the water about to go into the washer also.
Be forewarned, I doubt there is commercial equipment to capture or transfer this heat. One would need to design and engineer the tools to do this conversion. This can be very expensive. The expense of a failed prototype can be more than all of the energy saved in building several.
However, bob g has it right, there is no free lunch in physics. Any time one tries to recover energy from a pumping endeavor they are usually going backwards. Just the losses in small electrical generation units are about 60%+.
Well, good luck in your laundry. There are so many small energy saving projects there you will have plenty of things to think about before you figure out the utility companies actually do a damn good job of supplying reasonably priced power.
Ron