How to limit power going into a resistive load originally connected to AC mains
You state, &quot;the utility can track the power transit into and out of the installation.&quot; If that is the case, then you have two serious problems:

If the photovoltaic array is connected to the power line through an inverter, then any change you make could endanger others working on the power lines. In addition, your installation must be in phase with the AC mains, or you might actually draw power from the mains, possibly destroying your equipment and/or your house.
If the photovoltaic array is not connected to the power line, yet the electric utility is being informed of power generated, e.g. through an RF-connected power meter, it seems you would be guilty of fraud, since the utility provides a rebate based on the amount generated, but power is not being returned to the grid.

There are electrical codes in every area for good reason. Hire someone licensed to interpret those codes to make the changes you want, if the changes are feasible.