The department, after such hearing or investigation as it may deem proper, shall determine the actual or probable cost incurred or to be incurred; and, if in its judgment the issue of such securities upon the terms proposed is consistent with the public good, it shall authorize the same to an amount sufficient, at the price fixed in accordance with the laws applicable thereto, to provide funds for defraying the cost as so determined.
RSA 228:79
1985, 402:14.