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an m % m "not only at tbs time of the commencement of the service, hat likewise to keep p&ee with the growth of the com­munity or territory served and gradually to extend its system as the reasonable wants of the community or ter­ritory may require. Accordingly, a public utility, at the suit of a consumer, may be required to extend its service to any part of the district wherein it has re­ceived a franchise and has undertaken to operate, if the extension is a reasonable one, add a public service com­mission may, where its action is not unlawful, arbitrary or capricious, order such, an extension of service for the inhabitants in such territory* However, before a public service corporation can be required to enlarge its plant under a statute authorizing sueh requirement when it ought reasonably to be done, it must be found that the plant is not reasonably sufficient to furnish adequate service, that the enlargement is necessary to insure such service, and that it is within the scope of the original professed undertaking of the owner." A general statement of the principles which govern the reasonableness of a proposed increase in facilities or service of a public utility is found in the following quotation from 43 Am. Jur. page 602: "The right of an inhabitant or group of inhabitants of a community or territory served by a public service company to demand an extension of service for their benefit is not absolute and unqualified, but is to be determined by the reasonableness of the demand therefor under the cir­cumstances involved. The duty of a public service company to extend its service facilities, and the reasonableness of a demand for such extension, depend in general, upon the need and cost of such extension, and the return in revenue which may be expected as a result of the extensions the financial condition of the utility; the advantages to tbs public from such an extension; and the franchise or charter obligation to make such extension. In this last respect, a water company may be compelled to extend, its mains so as to supply all the inhabitants of the municipality by which it is franchised, if its charter requires it so to do. Furthermore, although a franchise ordinance provides that a water company need not extend its water mains along any ungraded street or alley, still, if the company has volun­tarily extended its main along sueh a street, it cannot re­fuse to supply a customer thereon, on the theory that it was not compelled to build along that street in the first place. "In regard to the reasonableness of the cost which an extension will entail, it is not necessary that a particular 2-