WASHINGTON, Circuit Judge.
This is a natural gas case, concerning the form of the rates to be charged by the petitioner, American Louisiana Pipe Line Company. Petitioner owns and operates an interstate natural gas pipeline running from' southern Louisiana to Michigan. The pipeline began operations in 1956. Currently, American Louisiana sells over 95% of its natural gas to two Michigan corporations, Michigan Wisconsin Pipe Line Company and Michigan Consolidated Gas Company. All three companies are wholly-owned subsidiaries of the American Natural Gas Company
A few words may be said about American Louisiana’s past tariff filings. In 1954, the Federal Power Commission issued a certificate of public convenience and necessity to American Louisiana, permitting it to begin building its facilities. A condition attached to the certification stated that American Louisiana must file a tariff satisfactory to the Commission at least 60 days before beginning operations. 13 F.P.C. 380, 393 (1954). A subsequent order reaffirmed this condition and reserved “the right to reject any such proposed tariff and service agreements and to prescribe appropriate tariff and service agreements * * 15 F.P.C. 23, 43 (1956). The Commission employs two principal rate forms. The “contract demand” form of rate fixes a set price for gas in dollars and cents per unit on the basis of experience in a test year. This is the conventional rate form in general use for natural gas pipelines. In its brief, the Commission concedes that in most natural gas rate cases the contract demand rate form is to be preferred. That form assures the pipeline customers of a definite price and stable supply. In turn, the set rate level stimulates the pipeline’s efforts to cut costs, thereby generating more capital for improvement and modernization of service, eventually resulting in lower charges to the consumer. See 18 F.P.C. 795, 799 (1957) (dissenting opinion). The “cost of service” form prescribes variable rates adjusted monthly so that a pipeline recovers its actual costs plus a fixed return. This rate is apparently used with new enterprises with little or no operating experience on which to base a contract demand rate.
[527]*527On June 11, 1956, American Louisiana filed a conventional contract demand rate schedule; this was rejected by the Commission. Its principal reason was that American Louisiana was a new enterprise and had no experience on which to base specific rates:
“As set forth in more detail hereinafter, American Louisiana’s cost of service is not sufficiently definitive at this time to support specified unit demand and commodity rates, such claimed costs of service appear excessive, and the proposed contract demand tariff does not seem appropriate for the sales to affiliates for the initial few years of service. *****
“We find that a cost of service type of tariff is necessary and proper here for the initial few years of service to protect American Louisiana (and its parent) if costs increase before increased rates can be made effective and to protect the public against excessive rates during the period required to properly determine costs of service and to effect rate reductions.” (Italics added.) 16 F.P.C. 779, 780-81 (1956).
The Commission prescribed a cost of service tariff “for the initial few years of service.”
On March 18, 1957, American Louisiana again filed a tariff based on a contract demand rate schedule. The Commission rejected this filing by a vote of 3-2. Viewing the contract demand filing as “premature,” the majority found:
“The brief period of actual operation does not yield sufficient experience to justify a change from the prescribed cost of service form of rate schedule to a contract demand rate schedule.” 18 F.P.C. at 798.
This rejection was expressly stated to be without prejudice to a future filing after sufficient operating experience had been accumulated. The inter-affiliate character of American Louisiana’s sales, which had been a factor in the rejection of the original filing, was not treated as an operative fact in this decision.1
On April 6, 1959, American Louisiana filed the contract demand tariff involved in this proceeding. At that time American Louisiana had been in operation for more than the two-year period suggested in the Commission’s 1957 decision as a prerequisite to the granting of a contract demand rate. After a field audit, on July 12, 1961, the Commission staff joined in a stipulation of American Louisiana’s overall cost of service (the annual revenue required to enable it to recover its operating costs and the allowed return on its rate base), based on test year operations for the year 1960. The Commission approved the stipulation, by order of October 20, 1961, with some modifications not here relevant. The Presiding Examiner approved the change in rate form requested by American Louisiana. The level of rates was lower than the level originally requested by American Louisiana, however; it was based on the cost of service stipulated for the test year 1960.
The Commission rejected the Presiding Examiner’s decision insofar as it permitted the change in rate form. It relied exclusively on the fact that American Louisiana sells virtually all of its gas to affiliates. In its Opinion and Order No. 387 issued May 16, 1963, the Commission ruled:
“We conclude that, contrary to the examiner, American Louisiana’s change from a cost-of-service to a conventional rate should be denied. As years of regulatory experience attest, sales to affiliates present possibilities of abuse and should be scrutinized with eare. * * * A cost-of-service rate affords us an effective and feasible means of supplying the desired supervision. Under such a rate, the seller’s charges to its affiliates are computed on the basis of its actual costs for succes[528]*528sive billing periods, plus the return allowed. Thereby the seller is permitted all costs to which it is entitled but no more, thus achieving the desideratum of utility rate regulation. **«■** -X-
“These arguments of Michigan Wisconsin [American Louisiana] do not support the requested change, nor was any evidence adduced to support it. American Louisiana is undeniably an affiliate of Michigan Wisconsin and Michigan Consolidated, which purchase in excess of 95 percent of its gas. These circumstances justify applying to it requirements not invoked against companies otherwise situated. * * * And on the present facts, we conclude that we can best attain the objective of rate regulation — the allowance of all proper costs and return but no more — by requiring the continued use of a cost-of-service form of rate.” (Footnotes omitted.)
American Louisiana has petitioned this court under Section 19(b) of the Natural Gas Act of 1938, 52 Stat. 831, as amended, 15 U.S.C. § 717r(b) (1958), to review this decision imposing a cost of service rate form. It has been the Commission’s regular practice to require established natural gas pipelines to sell on a contract demand basis. This practice is reflected in its regulations, which provide that a cost of service rate form will be allowed only “Upon application and for good cause shown.” 18 C.F.R. § 154.52.
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WASHINGTON, Circuit Judge.
This is a natural gas case, concerning the form of the rates to be charged by the petitioner, American Louisiana Pipe Line Company. Petitioner owns and operates an interstate natural gas pipeline running from' southern Louisiana to Michigan. The pipeline began operations in 1956. Currently, American Louisiana sells over 95% of its natural gas to two Michigan corporations, Michigan Wisconsin Pipe Line Company and Michigan Consolidated Gas Company. All three companies are wholly-owned subsidiaries of the American Natural Gas Company
A few words may be said about American Louisiana’s past tariff filings. In 1954, the Federal Power Commission issued a certificate of public convenience and necessity to American Louisiana, permitting it to begin building its facilities. A condition attached to the certification stated that American Louisiana must file a tariff satisfactory to the Commission at least 60 days before beginning operations. 13 F.P.C. 380, 393 (1954). A subsequent order reaffirmed this condition and reserved “the right to reject any such proposed tariff and service agreements and to prescribe appropriate tariff and service agreements * * 15 F.P.C. 23, 43 (1956). The Commission employs two principal rate forms. The “contract demand” form of rate fixes a set price for gas in dollars and cents per unit on the basis of experience in a test year. This is the conventional rate form in general use for natural gas pipelines. In its brief, the Commission concedes that in most natural gas rate cases the contract demand rate form is to be preferred. That form assures the pipeline customers of a definite price and stable supply. In turn, the set rate level stimulates the pipeline’s efforts to cut costs, thereby generating more capital for improvement and modernization of service, eventually resulting in lower charges to the consumer. See 18 F.P.C. 795, 799 (1957) (dissenting opinion). The “cost of service” form prescribes variable rates adjusted monthly so that a pipeline recovers its actual costs plus a fixed return. This rate is apparently used with new enterprises with little or no operating experience on which to base a contract demand rate.
[527]*527On June 11, 1956, American Louisiana filed a conventional contract demand rate schedule; this was rejected by the Commission. Its principal reason was that American Louisiana was a new enterprise and had no experience on which to base specific rates:
“As set forth in more detail hereinafter, American Louisiana’s cost of service is not sufficiently definitive at this time to support specified unit demand and commodity rates, such claimed costs of service appear excessive, and the proposed contract demand tariff does not seem appropriate for the sales to affiliates for the initial few years of service. *****
“We find that a cost of service type of tariff is necessary and proper here for the initial few years of service to protect American Louisiana (and its parent) if costs increase before increased rates can be made effective and to protect the public against excessive rates during the period required to properly determine costs of service and to effect rate reductions.” (Italics added.) 16 F.P.C. 779, 780-81 (1956).
The Commission prescribed a cost of service tariff “for the initial few years of service.”
On March 18, 1957, American Louisiana again filed a tariff based on a contract demand rate schedule. The Commission rejected this filing by a vote of 3-2. Viewing the contract demand filing as “premature,” the majority found:
“The brief period of actual operation does not yield sufficient experience to justify a change from the prescribed cost of service form of rate schedule to a contract demand rate schedule.” 18 F.P.C. at 798.
This rejection was expressly stated to be without prejudice to a future filing after sufficient operating experience had been accumulated. The inter-affiliate character of American Louisiana’s sales, which had been a factor in the rejection of the original filing, was not treated as an operative fact in this decision.1
On April 6, 1959, American Louisiana filed the contract demand tariff involved in this proceeding. At that time American Louisiana had been in operation for more than the two-year period suggested in the Commission’s 1957 decision as a prerequisite to the granting of a contract demand rate. After a field audit, on July 12, 1961, the Commission staff joined in a stipulation of American Louisiana’s overall cost of service (the annual revenue required to enable it to recover its operating costs and the allowed return on its rate base), based on test year operations for the year 1960. The Commission approved the stipulation, by order of October 20, 1961, with some modifications not here relevant. The Presiding Examiner approved the change in rate form requested by American Louisiana. The level of rates was lower than the level originally requested by American Louisiana, however; it was based on the cost of service stipulated for the test year 1960.
The Commission rejected the Presiding Examiner’s decision insofar as it permitted the change in rate form. It relied exclusively on the fact that American Louisiana sells virtually all of its gas to affiliates. In its Opinion and Order No. 387 issued May 16, 1963, the Commission ruled:
“We conclude that, contrary to the examiner, American Louisiana’s change from a cost-of-service to a conventional rate should be denied. As years of regulatory experience attest, sales to affiliates present possibilities of abuse and should be scrutinized with eare. * * * A cost-of-service rate affords us an effective and feasible means of supplying the desired supervision. Under such a rate, the seller’s charges to its affiliates are computed on the basis of its actual costs for succes[528]*528sive billing periods, plus the return allowed. Thereby the seller is permitted all costs to which it is entitled but no more, thus achieving the desideratum of utility rate regulation. **«■** -X-
“These arguments of Michigan Wisconsin [American Louisiana] do not support the requested change, nor was any evidence adduced to support it. American Louisiana is undeniably an affiliate of Michigan Wisconsin and Michigan Consolidated, which purchase in excess of 95 percent of its gas. These circumstances justify applying to it requirements not invoked against companies otherwise situated. * * * And on the present facts, we conclude that we can best attain the objective of rate regulation — the allowance of all proper costs and return but no more — by requiring the continued use of a cost-of-service form of rate.” (Footnotes omitted.)
American Louisiana has petitioned this court under Section 19(b) of the Natural Gas Act of 1938, 52 Stat. 831, as amended, 15 U.S.C. § 717r(b) (1958), to review this decision imposing a cost of service rate form. It has been the Commission’s regular practice to require established natural gas pipelines to sell on a contract demand basis. This practice is reflected in its regulations, which provide that a cost of service rate form will be allowed only “Upon application and for good cause shown.” 18 C.F.R. § 154.52. The regulations also state, with exceptions not here relevant, that “all rates shall be clearly stated in cents or in dollars and cents per unit,” and that “No * * * price adjustments or periodic changes shall be included in the rate schedule or any other part of the tariff which in any way purports to effect the modification or change of any rate or charge * * 18 C.F.R. § 154.38.
In the case before us, the Commission seeks to justify its departure from its established practice on the ground that inter-affiliate sales present special difficulties for effective rate regulation in the public interest. But the view that the seller’s affiliation with its customers was to be the decisive factor in determining rate form was new, and American Louisiana had no notice of it before the Commission’s decision was handed down.2 Fairness to American Louisiana would require that it be given an opportunity to address itself to the significance to be attached to the inter-affiliate character of the regulated sales. As has been noted, the Commission’s 1957 refusal of American Louisiana’s contract demand tariff filing was based on American Louisiana’s lack of operating experience. Nothing was stated about its affiliation with its customers.
The tariff involved in this litigation was filed on April 6, 1959. On August 31,1961, American Louisiana’s rate filing was consolidated for hearing with rate filings of its customer, Michigan Wisconsin. Hearings were held from January 30 to February 20, 1962. No evidence was introduced attacking American Louisiana’s contract demand tariff.3 [529]*529The focus of the hearing was Michigan Wisconsin’s split between commodity and demand rates. There was no suggestion that the matter of affiliation would be regarded as dispositive. Hence, we are told, American Louisiana did not introduce evidence on the question.
We think that fairness requires that American Louisiana should have had an opportunity to address itself to this matter. Cf. Hill v. Federal Power Commission, 335 F.2d 355 (5th Cir. 1964). In its application for rehearing it sought such an opportunity:
“It is respectfully submitted that, for the reasons hereinafter set forth, an opportunity should be provided to make a full and adequate presentation directly to the Commission of the reasons why American Louisiana should adhere to a conventional contract demand (CD-I) form of rate instead of being required to revert to a cost-formula (CS-1) rate and why the considerations adverted to the Commission’s opinion and order do not justify the imposition of a cost-formula rate on American Louisiana and its customers.
“It did not appear necessary or appropriate to discuss this question at the oral argument before the Commission on February 26, 1963. American Louisiana was very properly under the impression, on the basis of the Commission’s prior orders, that it had satisfied all of the conditions requisite to the acceptance of a conventional contract demand form of rate.”
The application was denied.
The Commission seemed to asgume that American Louisiana had the burden of proving the reaSonableness of itg proposed rate form. In its opinion, for example, the Commission stated that American Louisiana’s arguments “do not support the requested change, nor was any evidence adduced to support it.” in the view we take of Section 4(e) of the Natural Gas Act, 15 U.S.C. § 717c (e), and the proceedings in this case, the Commission’s assumption is unwarranted. Section 4(e) states in part:
“At any hearing involving a rate or charge sought to be increased, the burden of proof to show that the increased rate or charge is just and reasonable shall be upon the natural-gas company * * (Emphasis supplied.)
It is our view, and the respondent’s brief seems to concede as much, that Section 4(e) governs as to burden of proof, and that the burden of proof is on the gas company only if an increase in rates is involved. If the change in rate is not an increase, the burden of proof is on the party attacking the filed tariff or on the Commission if it attacks the tariff.4
Some confusion might arise from the fact that the tariff American Louisiana originally filed in this proceeding on April 6, 1959, did involve an increase in rate level as well as a change from cost of service to contract demand rate form. These rates went into effect on November 1, 1959, after the statutory five months suspension period, subject to refund.
[530]*530On July 12, 1961, American Louisiana and the Commission entered into a stipulation based on the experience of a test year, 1960. By its terms, for the period during which the filed tariff was in effect, up to December 31, 1960, American Louisiana was to refund to its customers a total of $2,044,961, the difference between its cost of service and the revenue actually collected under its filed tariff. The stipulation also set forth a new schedule of interim contract demand rates which replaced the rates originally filed by American Louisiana. These rates were designed to generate revenues that would equal the cost of service of the test year, 1960, normalized for known changes —$56,261,267.5 Hence, on the face of the tariffs, no increase in rate was involved at the time of the hearing. This is the time that is relevant under Section 4(e).6
We do not think that the fact that the tariff originally filed by American Louisiana was a rate increase gave it the burden of proof throughout the proceeding. After the stipulation, American Louisiana scaled down its requests so that the projected revenues beginning January 1, 1961, would equal the cost of service for 1960, normalized for known changes; thereafter, only a change in rate form was involved.7 The stipulated rates were to become effective on January 1, 1961. In deciding whether the new rate is an increase over the old rate, one naturally compares the revenue generated in the preceding period (calendar 1960) under the old rate with the revenue anticipated under the new rate during calendar 1961. In making this comparison the actual revenue collected in 1960 is not the relevant figure, since these revenues were collected under American Louisiana’s filed tariff, which went into effect on November 1, 1959. The relevant figure is the cost of service for 1960 (expenses plus allowable re[531]*531turn — 6% of the rate base); this figure states how much would have been collected under American Louisiana’s old rate. The comparison of this figure, normalized for known changes, with the new rate shows that the new rate was not conceived as an increase in rate level.8
Based on the stipulated rates, there is no rate increase, unless the shift in form is itself an increase in rate level. A change of rate form designed to generate revenues equal to the actual revenues of the preceding year less appropriate refund and normalized for known changes is not, on its face, a rate increase. The Commission in its brief seems to suggest two possible reasons for considering the change in form an increase. First, it argues that a change from cost of service to contract demand necessarily involves a rate increase. But this proposition is novel, and it has no support in the record. Second, the Commission argues that the change in form is equal to an increase of rates on the facts of this case; but the facts on which the Commission relies again have no basis in the record. For example, the Commission asserts that American Louisiana is a declining rate base company so that a cost of service rate would constantly decline, leading to savings for consumers. Hence, the adoption of a contract demand rate, with constant charges, would amount to a rate “increase.” This is a disputable matter which American Louisiana should have an opportunity to argue in an adversary hearing. Petitioners convincingly argue in their brief in this court that the Commission’s analysis of American Louisiana’s future financial status is oversimplified and misleading.9 The placing of the burden of proof on American Louisiana by the Commission is unjustified because of the absence of a prior determination, on evidence, that the proposed change involves an increase in rates.10 Furthermore, even if these theories were supported by the record, if the Commission was going to rely on either of them to establish the existence of a rate increase, American Louisiana should have been forewarned and given an opportunity to dispute the theories. Then if either of the positions here urged had been sustained, American Louisiana could have attempted to bear the burden of proof they would impose.
On remand, the Commission should first determine whether the proposed change in form is also an increase in rate. We are not prepared to say, as a matter of law, that a shift from cost of service to contract demand rates, pegging the new rate to the cost of service in the preceding year, can never be regarded as a rate increase under Section 4(e). That section could be read as placing the burden of proof on the proponent of a new rate which would maintain the existing revenues of a pipeline whose revenues would otherwise have decreased. But the [532]*532decision could only' be made after inquiry.11
It may be argued that, even if the Commission had the burden of proving American Louisiana’s rate unreasonable, it adequately supported the burden. We do not find this argument convincing. The asserted need for cost of service rates for effective regulation of inter-affiliate sales has no basis in this record or, so far as appears, in the Commission’s prior proceedings. With all respect for the Commission’s expertise, we do not think that the Commission’s opinion, reached without hearing or argument, that a contract demand rate is unreasonable for a pipeline which sells principally to affiliates, adequately bears its burden of proving unreasonableness in this case. While we concede that inter-affiliate transactions present special regulatory problems, “possibilities of abuse” presented by inter-affiliate sales do not support the conclusion that such sales must be made on cost of service rates. The Commission’s “years of regulatory experience” cannot substitute for facts.12 A great part of’ the Commission’s brief is devoted to showing that the shift in form is actually a way of increasing profits. As we have noted above, we are not convinced by anything in the record that this change in form would necessarily increase profits and rob the consumer of future savings. And if the change in form does not do this, it would be hard to say that the change is unreasonable.
On remand the Commission should first decide whether the change in rate form is the equivalent of an increase in rate level, and place the burden of proof accordingly. After deciding this preliminary point, the Commission should hold an evidentiary hearing and decide whether the change to contract demand is reasonable, unreasonable on the facts of this case,13 or unreasonable per se in any case involving inter-affiliate sales of gas. If the last alternative is thought proper, the Commission should provide other interested parties an op[533]*533portunity to be heard. 5 U.S.C. § 1003 (a). There is no need for us to express any views on the merits of this question at this time.
For the above reasons, the Commission’s decision must be reversed and the matter remanded to it for further hearings not inconsistent with this opinion.
So ordered.