The commission, upon the making of a valuation, shall:

Terms Used In North Dakota Code 49-06-15

1.    Keep itself informed through its experts and other assistants of all extensions and improvements or other changes in the conditions and value of the property of the public utility; 2.    Ascertain the value of such extensions, improvements, and changes; and

3.    Revise and correct, from time to time, its valuation of such property.