This appeal arises from a utility rate order entered by the Public Service Commission of Missouri (hereinafter Commission). The controversial order authorized Laclede Gas Company (hereinafter Laclede) to impose, on an interim basis, a surcharge tariff on gas service customers who supplement their space heating needs with electric add-on heat pumps.
Heat pumps, devices of recent origin, are a technological adaptation of a scientific fact discovered by an English scientist, Lord Kelvin, in 1852 — there is heat in cold air down to absolute zero (minus 459.69 degrees Fahrenheit). Their versatility is exemplified by their ability to both heat and cool. Simplistically stated, they can serve as central air conditioners during warm seasons and then, during cold seasons, reverse their operation and extract heat from outside air for internal heating purposes. Their use in conjunction with commercial heating systems as supplemental sources of heat accelerated with the advent of the recent energy crisis.
A potential aura of confusion arising from alignment of the parties calls for an explanation. Marco Sales, Inc., a distributor of electric add-on heat pumps in the St. Louis area, and Dierberg Service Company, Inc., one of its dealers (hereinafter collectively referred to as Marco), filed a formal complaint with the Commission charging that Laclede was in violation of § 393.130, RSMo 1978, by its unilateral promulgation of a surcharge on gas customers utilizing electric add-on heat pumps without obtaining tariff approval from the Commission. Laclede answered the complaint lodged by Marco and, in addition, filed a proposed surcharge tariff whose approval by order of the Commission is the genesis of the present appeal. Marco, The Trane Company (hereinafter Trane), and Union Electric Company (hereinafter Union Electric) were permitted to intervene in the tariff case at the Commission level. The complaint and proposed surcharge tariff were consolidated for hearing before the Commission.
The tariff order in question, paraphrased in general terms, authorized Laclede to impose a uniform monthly surcharge (approximately $15.00 per month) on each gas customer with an electric add-on heat pump during the months of November, December, January, February, March and April. After the order was handed down by the *218Commission, Marco filed an application for rehearing pursuant to § 386.500, RSMo 1978, which was denied by the Commission. Thereupon, Marco filed an application for review in the Circuit Court of Cole County as provided in § 386.510, RSMo 1978. The Circuit Court of Cole County granted Marco’s application for review and also permitted Laclede to intervene as a respondent therein, and the Office of the Public Counsel, Trane and Union Electric to intervene as relators therein.
The Circuit Court of Cole County reversed the order of the Commission approving the surcharge tariff on Laclede’s gas customers using electric add-on heat pumps and ordered Laclede to refund any and all monies collected under the interim surcharge tariff to affected customers. The order of reversal entered by the Circuit Court of Cole County was accompanied by extensive findings of fact. Those deemed most pertinent to the timely appeals of the Commission and Laclede to this court are recapitulated as follows: (1) There was no competent and substantial evidence upon the whole record to support the Commission’s finding that Laclede’s use of 34 degrees Fahrenheit as a “balance” or “changeover” point for the average electric add-on heat pump was reasonable; (2) There was no competent and substantial evidence upon the whole record to support the Commission’s finding that Laclede would suffer a revenue deficiency by serving gas customers with electric add-on heat pumps under its current tariff; and (3) There was no competent and substantial evidence upon the whole record to support the Commission’s finding that electric add-on heat pumps, due to unique and inherent operating characteristics, have an impact on Laclede’s load factor different from that of other supplementary heating devices.
The scope of judicial review of decisions of the Commission is forged by Mo. Const. Art. V, § 18 (as amended 1976 —formerly Art. V, § 22) providing that “such review shall include the determination whether the same are authorized by law, and in cases in which a hearing is required by law, whether the same are supported by competent and substantial evidence upon the whole record.” This constitutional mandate establishes a minimum standard of judicial review which may be statutorily broadened so long as doing so is not in conflict with or repugnant to the federal and state constitutions. State ex rel. St. Louis Pub. Serv. Co. v. Pub. Serv. Comm’n, 365 Mo. 1032, 291 S.W.2d 95, 101-02 (1956). Judicial inquiry into the “reasonableness or lawfulness” of decisions or orders of the Commission prescribed by § 386.510, RSMo 1978, however, is nothing more than a reaffirmation of the constitutional mandate as questions of “lawfulness” turn on whether the Commission’s orders or decisions are statutorily authorized and questions of “reasonableness” turn on whether there is competent and substantial evidence upon the whole record to support them. State ex rel. Ozark Elec. Coop. v. Pub. Serv. Comm’n, 527 S.W.2d 390, 392 (Mo.App.1975). In the context at hand, “substantial evidence” means evidence “which, if true,” has “probative force upon the issues” and “implies and comprehends competent, not incompetent evidence.” State ex rel. Rice v. Pub. Serv. Comm’n, 359 Mo. 109, 220 S.W.2d 61, 64 (banc 1949).
Cognizance is also taken of certain tangential attributes associated with judicial review of orders and decisions of the. Commission: (1) The decision of the Commission, not the judgment of the Circuit Court, is the subject of appellate review — State ex rel. Pub. Water Supply Dist. No. 8 v. Pub. Serv. Comm’n, 600 S.W.2d 147, 149 (Mo.App.1980); (2) Orders and decisions of the Commission are “pri-ma facie” lawful and reasonable “until found otherwise” when judicially challenged — § 386.270, RSMo 1978; (3) The party complaining of an order or decision of the Commission must “show by clear and satisfactory evidence” that the order or decision of the Commission “is unreasonable or unlawful” as the case may be — § 386.430, RSMo 1978; and (4) Although courts on judicial review need not *219defer to the Commission on questions of “lawfulness”, they cannot substitute their judgment for that of the Commission where its order or decision is supported by competent and substantial evidence upon the record as a whole — State ex rel. Util. Consumers Council of Mo., Inc. v. Pub. Serv. Comm’n, 585 S.W.2d 41, 47 (Mo. banc 1979).
The Commission and Laclede stridently contend on appeal that the surcharge tariff was, in all respects, supported by competent and substantial evidence upon the whole record, but, in the unlikely event that it was not, the trial court erred in ordering Laclede to refund to affected customers all monies collected under the interim surcharge tariff from November 1, 1982, to June 2, 1983. Relators-respon-dents concede in their briefs on appeal that under State ex rel. Kansas City v. Pub. Serv. Comm’n, 362 Mo. 786, 244 S.W.2d 110 (1951), cited and relied upon by Lac-lede, the Circuit Court of Cole County exceeded its authority in ordering Laclede to refund all monies collected under the interim surcharge tariff.
Perforce, as succinctly put by Laclede in its reply brief, “[a]ll of the parties to this appeal concur that the issue to be resolved by ... [the Missouri Court of Appeals, Western District] is whether or not the Commission’s Report and Order is supported by competent and substantial evidence.”
From Laclede’s vantage point, the surcharge tariff is purportedly justified on two grounds: (1) the comprehensive nature of its General Service Rate structure; and (2) the mean or average temperature “balance” or “changeover” point at which electric add-on pumps cease to be operational. Attention first focuses on Laclede’s General Service Rate structure. According to Laclede, it has an inexpensive source of gas available to meet consumer demand when the outside temperature is above 34 degrees Fahrenheit. However, when the outside temperature falls below 34 degrees Fahrenheit increased consumer demand must be met by more expensive sources of gas. Nevertheless, Laclede’s rate per unit of gas to its customers remains constant as it reflects an overall margin of return for all gas consumed by an average customer on a constant rate basis. Advancing its argument a step further, Laclede asserts that its overall margin of return between the cost of gas and the rate charged is substantially narrowed by customers whose demands for gas principally occur when the outside temperature falls below 34 degrees Fahrenheit. Suffice it to say, Laclede contends that gas customers with electric add-on heat pumps constitute a class whose demands for gas substantially increase when the outside temperature falls below 34 degrees Fahrenheit. To alleviate the narrowing margin between gas rates and cost of gas ostensibly occasioned thereby, Laclede conceived the surcharge tariff on gas customers supplementing their heating needs with electric add-on heat pumps.
Attention next focuses on the mean or average temperature “balance” ' or “changeover” point of 34 degrees Fahrenheit seized upon by Laclede as the structural core of its proposed surcharge tariff. Relying upon syllogism and mathematical calculations, Laclede advances the proposition that a surcharge tariff of $15.00 per month for each month starting in November and ending in April (totaling $90.00) would offset its theoretically narrowing margin of return between the cost of gas and the constant rate charge occasioned by customers with electric add-on heat pumps whose gas needs must be met by gas obtained by Laclede at premium prices. At this juncture the significance of the following observations is self-evident — Laclede’s use of 34 degrees Fahrenheit as a mean or average temperature “balance” or “changeover” point at which electric add-on heat pumps cease to be operational is the linch-pin of the controversial surcharge tariff. Hypothetically, if the mean or average temperature “balance” or “changeover” point at which electric add-on heat pumps cease to be operational is higher than 34 degrees Fahrenheit, then the surcharge tariff approved by the Commission is proportionally unfair and discriminatory with respect to the majority of gas customers *220with electric add-on heat pumps. Conversely, if the mean or average temperature “balance” or “changeover” point at which electric add-on heat pumps cease to be operational is lower than 34 degrees Fahrenheit, then the surcharge tariff approved by the Commission is proportionately unfair and discriminatory with respect to gas customers who do not supplement their heating needs with electric add-on heat pumps.
The record in this ease is fragmented with random bits of evidence regarding the temperature “balance” or “changeover” point at which various electric add-on heat pumps, subject to innumerable variables such as size, age, design, and premise insulation factors, cease to be operational. The temperature “balance” or “changeover” points mentioned run the gamut from approximately 44 degrees Fahrenheit to approximately 0 degrees Fahrenheit. There was no evidence, estimates or otherwise, of the market share of any of the various heat pumps just mentioned. In sum, none of the random bits of evidence, singularly or collectively, provided a foundation for establishing 34 degrees Fahrenheit as a mean or average temperature “balance” or “changeover” point at which electric add-on heat pumps cease to be operational.
Laclede attempts to weld the linch-pin of its surcharge tariff by emphasizing the testimony of one of its employees, who, although absent indicating or claiming any expertise in the field of electric add-on heat pumps, and absent making any “independent studies”, concluded that 34 degrees Fahrenheit represented a mean or average temperature “balance” or “changeover” point at which electric add-on heat pumps cease to be operational on the basis of some “ads” he had read and what others had told him. The record has been searched in vain for other evidence, whatever its character, which could arguably be said to support 34 degrees Fahrenheit as a mean or average temperature “balance” or “changeover” point at which electric add-on heat pumps cease to be operational. It is patent that the only evidence Laclede and the Commission have to rely on to preserve the integrity of their surcharge tariff is the unmitigated hearsay heretofore mentioned.
Cases are legion that hearsay evidence does not rise to the level of “competent and substantial evidence” within the ambit of Mo. Const. Art. V, § 18. State ex rel. DeWeese v. Morris, 359 Mo. 194, 221 S.W.2d 206, 209 (1949); Dickinson v. Lueckenhoff, 598 S.W.2d 560, 561-62 (Mo.App.1980); Wilson v. Labor and Indus. Relations Comm’n, 573 S.W.2d 118, 120-21 (Mo.App.1978); Bartholomew v. Bd. of Zoning Adjustment, 307 S.W.2d 730, 733 (Mo.App.1957); State ex rel. Horn v. Randall, 275 S.W.2d 758, 763 (Mo.App.1955); and Dittmeier v. Missouri Real Estate Comm’n, 237 S.W.2d 201, 206 (Mo.App.1951).
Laclede and the Commission seek to avoid the fatal consequence of the eviden-tiary deficiency by the classic hue and cry of virtually limitless discretion possessed by the Commission, the admonition that courts should not substitute their judgment for that of the Commission, and the indulgence of deference for decisions of the Commission because of its expertise in the complicated and highly sophisticated matters it is legislatively ordained to resolve. Judicial recognition thereof when and where appropriate, however, does not dictate blind acceptance of every order cut and every decision handed down by the Commission. Indiscriminate approval of orders and decisions of the Commission, without subjecting them to the rigors of Mo. Const. Art. V, § 18, is an abdication of judicial responsibility. Unbridled bureaucracy is the subtle destroyer of people’s rights and Mo. Const. Art. V, § 18, is their response.
Having concluded that there was no “competent and substantial evidence” upon the whole record to support a finding by the Commission that 34 degrees Fahrenheit was a mean or average temperature “balance” or “changeover” point at which electric add-on heat pumps cease to be operational, the surcharge tariff sought by Lac-lede and approved by the Commission falls apart for want of a linch-pin. Perforce, the *221Circuit Court of Cole County was eminently justified when it invalidated the surcharge tariff on the ground heretofore discussed.
Although it is unnecessary from a dispo-sitional standpoint to analyze or discuss the other invalidating grounds relied on by the Circuit Court of Cole County, one in particular merits special attention because of its potential aftermath. The Circuit Court of Cole County concluded that there was no competent and substantial evidence to support a finding by the Commission that users of electric add-on heat pumps legally constituted a separate, distinct class for rate purposes and, concomitantly, the surcharge tariff was discriminatory.
Section 393.130.3, RSMo 1978, provides, inter alia, that no “gas corporation” shall subject “any particular person, corporation or locality or any particular description of service to any undue or unreasonable prejudice or disadvantage in any respect whatsoever.” Admittedly, “ ‘[a] discrimination as to rates is not unlawful where based upon a reasonable classification corresponding to actual differences in the situation of the consumers or the furnishing of the service.’ ” Smith v. Pub. Serv. Comm’n, 351 S.W.2d 768, 771 (Mo.1961). The court in Smith goes on to point out, however, that “ ‘the reasonableness of the basis of the classification must appear; and whether a discrimination is unlawful and unjust or the circumstances substantially dissimilar is usually a question of fact.’ ” Id. 771. Thus, justification vel non for grouping gas customers with electric add-on heat pumps into a separate rate class goes full circle and raises the specter of whether competent and substantial evidence existed to support the classification as reasonable. Briefly, Laclede and the Commission submit that electric add-on heat pumps possess “distinguishing characteristics” which are “inherently determinable” by virtue of being designed to totally eliminate the use of gas for heating purposes for prolonged periods of time as opposed to other supplemental heat devices, e.g. kerosene space heaters, wood burning fireplaces and solar units. This court observes, in the frame of reference at hand, that the evidence relied upon by Laclede and the Commission to fill the role of “competent and substantial evidence” treads dangerously close to, if not in, the quicksands of speculation, conjecture and surmise.
There is no escape from the fact that the innovative features of electric add-on heat pumps have brought about a head-on confrontation between manufacturers and users of electric add-on heat pumps on the one hand and consumer oriented natural gas utilities on the other hand. This court is not so naive as to believe that the instant opinion has put this confrontation to final rest. This court is also aware that a seasonal rate differential, i.e., a lower rate applicable when the outside temperature is 34 degrees Fahrenheit or better and a higher rate applicable when the outside temperature is below 34 degrees Fahrenheit, would probably be looked upon with disfavor by Laclede because of its adverse psychological impact upon its gas customers. Psychologically, the marketplace is geared to quantity discounts not increases.
A few conclusionary remarks are in order regarding Laclede’s contention, and Marco’s acquiescence therein, that under State ex rel. Kansas City v. Pub. Serv. Comm’n, supra, the trial court erred in ordering Laclede to refund to affected customers all monies collected under the interim surcharge tariff from November 1, 1982, to and including June 2, 1983. The controversial surcharge tariff was not suspended during the pendency of the writ of review pursuant to § 386.520, RSMo 1978. Both the instant case and State ex rel. Kansas City v. Pub. Serv. Comm’n, supra, are distinguishable from State ex rel. Util. Consumers Council of Mo., Inc. v. Pub. Serv. Comm’n, supra. Having concluded that Kansas City rather than Consumers Council controls, it necessarily follows that the trial court erred in ordering Lac-lede to refund all monies collected under the interim surcharge tariff from November 1, 1982, to and including June 2, 1983.
*222That portion of the order or judgment of the Circuit Court of Cole County reversing and invalidating the interim surcharge tariff on gas customers with electric add-on heat pumps sought by Laclede and approved by the Commission on October 20, 1982, effective March 1, 1982, is hereby affirmed; however, that portion of the order or judgment of the Circuit Court of Cole County ordering Laclede to refund to affected customers all monies collected under the interim surcharge tariff from November 1, 1982, to and including June 2, 1983, is reversed.
Judgment affirmed in part and reversed in part.
PRITCHARD, P.J., concurs.
KENNEDY, J., dissents in separate dissenting opinion.