KCBPU shall exclusively manage, operate, maintain and control the daily operation of any utility. KCBPU shall be charged with the exclusive duty of producing and supplying the unified government and the inhabitants within the city with utility services or products provided by any utility for domestic, commercial and industrial purposes and for public use within the city. KCBPU may also produce and supply such utility services and products outside the city on an exclusive or nonexclusive basis. KCBPU shall have the exclusive duty of providing steam and chilled water for heating and cooling for commercial and industrial purposes within the city unless upon application made to the unified government, KCBPU declines to do so, and subject to the a provisions of K.S.A. 66-104 and 66-131. KCBPU may contract for the purchase and sale of utility services or products within or outside the city as deemed necessary for the ultimate benefit of the unified government and the inhabitants within the city; and provided further that all extensions of retail water service outside the city limits shall be made only if the retail price charged for such service is equal to or greater than the retail price charged for services within the city.