A.
Borough operated utilities (including water, sewer, electric, sanitation, and ports and harbors) shall be operated from an enterprise fund or funds separate from the general fund. An accounting system for each such fund shall be established within the general accounting system of the borough, and shall be so set up and maintained as to reflect the financial condition of the enterprise or enterprises and its or their income and expense. A balance sheet and statement of income and expense (profit and loss) shall be made for each such fund annually and as often as the assembly may require.
B.
None of the income, money, resources or property of the enterprise fund or funds shall be placed in the general fund or be used for the benefit of anything outside of the fund to which it belongs without due compensation or due value received in return; provided that this shall not prohibit payment into the general fund by such utilities of an amount in lieu of taxes reasonably estimated to be the amount which said utilities would pay in taxes if they were privately owned.