For the purpose of defraying the cost of acquiring such plants, or any one or more of them, or any part or parts thereof and making improvements and extensions thereto, either by purchase, construction, condemnation or otherwise, any municipal corporation or county may borrow money from any lender whomsoever, in such amount or amounts as the governing body of such municipal corporation or county may deem necessary or expedient, but no such municipal corporation or county that has reached or exceeded its constitutional debt limit which borrows money under the authority of this article shall bind its general credit or incur any personal liability or charge any general or special fund other than that authorized in this article or charge any property other than that authorized in this article for the repayment of such borrowed money or the payment of interest thereon.