Opinion per curiam.
Concurring opinion filed by Senior Circuit Judge BAZELON.
PER CURIAM:
Petitioner General Motors Corporation (GM) seeks to set aside an order of the Federal Energy Regulatory Commission (Commission) which dismissed without a hearing GM’s complaint against a natural gas curtailment plan filed with the Commission by the Natural Gas Pipeline Company of America (Pipeline). GM contends that the Commission abused its discretion in dismissing its complaint. We hold that it did not, and we accordingly deny the petition to set aside the Commission’s order.1
Pipeline operates a natural gas pipeline system extending from the southwestern United States to the Chicago metropolitan area. It makes interstate sales of natural gas to municipalities, utility companies, and several industrial users. Among its customers are two Illinois natural gas distributors doing business as the Northern Illinois Gas Company (NI-Gas) and the Peoples Gas, Light & Coke Company (Peoples). NI-Gas and Peoples’ intrastate distribution activities are subject to the regulatory authority of the Illinois Commerce Commission. GM, which operates three industrial plants in Illinois, purchases natural gas from NI-Gas and Peoples.
Pipeline began curtailing deliveries of natural gas to its customers in 1970. In 1971 it filed with the Commission 2 a settlement agreement providing for the permanent allocation to be effective in 1972 and thereafter.3 The curtailment plan makes a distinction between Pipeline’s smaller customers and its nine major customers, the latter accounting for approximately 97% of Pipeline’s sales.4 Under the plan, the vol[209]*209ame of gas estimated to be required by the smaller customers is subtracted from Pipeline’s total gas supply available for sales. The amount of gas which a small customer receives from Pipeline during curtailment periods varies within the customer’s 1971 contractual limits as the customer’s needs change over time. Although the plan allows these smaller customers to increase their entitlements to serve newly attached firm load, in no event can the gas purchased by these customers from Pipeline exceed their daily or monthly contract quantities fixed by their tariffs effective in 1971.
Each of Pipeline’s nine major customers is assigned a “Basic Annual Quantity” of natural gas which represents that customer’s negotiated share of Pipeline’s remaining projected gas supply. The Basic Annual Quantity is a fixed volume; it does not increase as the customer attaches new firm load or provides more gas to its customers. If shortages occur in Pipeline’s gas supply, each of the major customers will be curtailed pro rata from the negotiated Basic Annual Quantity until each major customer has been reduced to a 75% annual load factor.5 Additional curtailments beyond this point are allocated among all Pipeline’s customers.
The Commission approved Pipeline s curtailment plan in 1971. Natural Gas Pipeline Company of America, 46 F.P.C. 1262 (1971). The Commission has twice revised the plan by order since that time, but has not altered its essential characteristics.6 None of Pipeline’s customers have complained about the plan since its inception.
In January 1973 the Commission adopted Order No. 467 in which it described its policies on the priorities of deliveries to be observed by interstate pipelines during periods of curtailment.7 Under this policy statement, the highest priority (that is, the last to be curtailed) is residential and small commercial users. The second highest priority is large commercial users and firm industrial uses for plant protection, feedstock, and process needs. The Commission’s statement declared that curtailment plans based on the “end-use” to which the natural gas would be put is the most effective way of ensuring protection for high priority users. The Commission said, however, that the decision to apply or not to apply an end-use-based system would require further proceedings into individual curtailment plans.8
[210]*210As a result of such further proceedings the Commission has stated its policy of favoring two limitations on curtailment plans which are designed to avoid incentives to pipeline customers to compete for available pipeline supplies by expanding their high-priority markets. One of these limitations bases allocations on actual deliveries for each end-use category during a fixed historical base period. The other imposes volumetric limitations on deliveries to each pipeline customer.
In April 1976 GM filed a complaint with the Commission pursuant to Rule 1.6 of the Commission’s Rules of Practice.9 Citing the Commission’s Order No. 467 Series, GM alleged that Pipeline’s curtailment plan is unjust, unreasonable, and discriminatory in violation of section 5(a) of the Natural Gas Act, 15 U.S.C. § 717d(a) (1976),10 because the curtailment plan (1) is not based on end-use, (2) lacks effective volumetric limitations, (3) is not implemented through use of a fixed historical base period, and (4) [211]*211contains incentives for expansion of high-priority markets by Pipeline’s customers. GM contended that these features of the plan were creating “increasingly severe problems” in Pipeline’s service area which were exacerbated by Pipeline’s “declining gas supply.” As evidence of the curtailment plan’s ostensibly generous view of expansion policies, GM pointed to the attachment policies being pursued by NI-Gas and Peoples and to the fact that Pipeline’s smaller customers were allowed to increase their entitlements. GM demanded a hearing on the Pipeline curtailment plan, asking that Pipeline show cause why the plan was not unlawful.
In accordance with its rules,11 the Commission forwarded the complaint to Pipeline, which filed a detailed answer to GM’s charges in May 1976. A number of Pipeline’s customers also filed pleadings opposing GM’s complaint. After giving public notice of the complaint and soliciting additional comments, the Commission took the matter under advisement. In May 1977, it issued an order dismissing the complaint, holding that GM had failed to state sufficient facts to warrant a lengthy investigation into the lawfulness of Pipeline’s curtailment plan. The Commission reasoned, inter alia, that the fact that a curtailment plan was not based on end-use did not render the plan a per se violation of section 5(a); that the expansion policies of NI-Gas and Peoples were within the regulatory jurisdiction of the Illinois Commerce Commission; and that GM’s allegations had failed to disclose the existence of a direct and immediate injury to GM from the continuance of Pipeline’s curtailment plan.
GM then applied for rehearing, charging that the Commission had failed adequately to explain why a formal hearing was not necessary to investigate Pipeline’s alleged gas shortages and why an end-use plan should not be imposed on Pipeline. The Commission granted rehearing for the purpose of additional consideration, and asked interested parties to respond to GM’s complaint. In July 1977, after considering these additional pleadings, the Commission again dismissed GM’s complaint.
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Opinion per curiam.
Concurring opinion filed by Senior Circuit Judge BAZELON.
PER CURIAM:
Petitioner General Motors Corporation (GM) seeks to set aside an order of the Federal Energy Regulatory Commission (Commission) which dismissed without a hearing GM’s complaint against a natural gas curtailment plan filed with the Commission by the Natural Gas Pipeline Company of America (Pipeline). GM contends that the Commission abused its discretion in dismissing its complaint. We hold that it did not, and we accordingly deny the petition to set aside the Commission’s order.1
Pipeline operates a natural gas pipeline system extending from the southwestern United States to the Chicago metropolitan area. It makes interstate sales of natural gas to municipalities, utility companies, and several industrial users. Among its customers are two Illinois natural gas distributors doing business as the Northern Illinois Gas Company (NI-Gas) and the Peoples Gas, Light & Coke Company (Peoples). NI-Gas and Peoples’ intrastate distribution activities are subject to the regulatory authority of the Illinois Commerce Commission. GM, which operates three industrial plants in Illinois, purchases natural gas from NI-Gas and Peoples.
Pipeline began curtailing deliveries of natural gas to its customers in 1970. In 1971 it filed with the Commission 2 a settlement agreement providing for the permanent allocation to be effective in 1972 and thereafter.3 The curtailment plan makes a distinction between Pipeline’s smaller customers and its nine major customers, the latter accounting for approximately 97% of Pipeline’s sales.4 Under the plan, the vol[209]*209ame of gas estimated to be required by the smaller customers is subtracted from Pipeline’s total gas supply available for sales. The amount of gas which a small customer receives from Pipeline during curtailment periods varies within the customer’s 1971 contractual limits as the customer’s needs change over time. Although the plan allows these smaller customers to increase their entitlements to serve newly attached firm load, in no event can the gas purchased by these customers from Pipeline exceed their daily or monthly contract quantities fixed by their tariffs effective in 1971.
Each of Pipeline’s nine major customers is assigned a “Basic Annual Quantity” of natural gas which represents that customer’s negotiated share of Pipeline’s remaining projected gas supply. The Basic Annual Quantity is a fixed volume; it does not increase as the customer attaches new firm load or provides more gas to its customers. If shortages occur in Pipeline’s gas supply, each of the major customers will be curtailed pro rata from the negotiated Basic Annual Quantity until each major customer has been reduced to a 75% annual load factor.5 Additional curtailments beyond this point are allocated among all Pipeline’s customers.
The Commission approved Pipeline s curtailment plan in 1971. Natural Gas Pipeline Company of America, 46 F.P.C. 1262 (1971). The Commission has twice revised the plan by order since that time, but has not altered its essential characteristics.6 None of Pipeline’s customers have complained about the plan since its inception.
In January 1973 the Commission adopted Order No. 467 in which it described its policies on the priorities of deliveries to be observed by interstate pipelines during periods of curtailment.7 Under this policy statement, the highest priority (that is, the last to be curtailed) is residential and small commercial users. The second highest priority is large commercial users and firm industrial uses for plant protection, feedstock, and process needs. The Commission’s statement declared that curtailment plans based on the “end-use” to which the natural gas would be put is the most effective way of ensuring protection for high priority users. The Commission said, however, that the decision to apply or not to apply an end-use-based system would require further proceedings into individual curtailment plans.8
[210]*210As a result of such further proceedings the Commission has stated its policy of favoring two limitations on curtailment plans which are designed to avoid incentives to pipeline customers to compete for available pipeline supplies by expanding their high-priority markets. One of these limitations bases allocations on actual deliveries for each end-use category during a fixed historical base period. The other imposes volumetric limitations on deliveries to each pipeline customer.
In April 1976 GM filed a complaint with the Commission pursuant to Rule 1.6 of the Commission’s Rules of Practice.9 Citing the Commission’s Order No. 467 Series, GM alleged that Pipeline’s curtailment plan is unjust, unreasonable, and discriminatory in violation of section 5(a) of the Natural Gas Act, 15 U.S.C. § 717d(a) (1976),10 because the curtailment plan (1) is not based on end-use, (2) lacks effective volumetric limitations, (3) is not implemented through use of a fixed historical base period, and (4) [211]*211contains incentives for expansion of high-priority markets by Pipeline’s customers. GM contended that these features of the plan were creating “increasingly severe problems” in Pipeline’s service area which were exacerbated by Pipeline’s “declining gas supply.” As evidence of the curtailment plan’s ostensibly generous view of expansion policies, GM pointed to the attachment policies being pursued by NI-Gas and Peoples and to the fact that Pipeline’s smaller customers were allowed to increase their entitlements. GM demanded a hearing on the Pipeline curtailment plan, asking that Pipeline show cause why the plan was not unlawful.
In accordance with its rules,11 the Commission forwarded the complaint to Pipeline, which filed a detailed answer to GM’s charges in May 1976. A number of Pipeline’s customers also filed pleadings opposing GM’s complaint. After giving public notice of the complaint and soliciting additional comments, the Commission took the matter under advisement. In May 1977, it issued an order dismissing the complaint, holding that GM had failed to state sufficient facts to warrant a lengthy investigation into the lawfulness of Pipeline’s curtailment plan. The Commission reasoned, inter alia, that the fact that a curtailment plan was not based on end-use did not render the plan a per se violation of section 5(a); that the expansion policies of NI-Gas and Peoples were within the regulatory jurisdiction of the Illinois Commerce Commission; and that GM’s allegations had failed to disclose the existence of a direct and immediate injury to GM from the continuance of Pipeline’s curtailment plan.
GM then applied for rehearing, charging that the Commission had failed adequately to explain why a formal hearing was not necessary to investigate Pipeline’s alleged gas shortages and why an end-use plan should not be imposed on Pipeline. The Commission granted rehearing for the purpose of additional consideration, and asked interested parties to respond to GM’s complaint. In July 1977, after considering these additional pleadings, the Commission again dismissed GM’s complaint. The Commission reiterated its view that GM had failed to show injury from the implementation of Pipeline’s plan. It also again declined wholesale application of its Order No. 467 to every pipeline system, adding that it found effective market deterrents to expansion in Pipeline’s curtailment plan.
On this petition GM argues that the Commission’s orders represent an abuse of discretion, are arbitrary and capricious, and lack substantial evidence. It insists that in light of its allegations of increasing curtailments the Commission was obliged to conduct a formal hearing into the lawfulness of Pipeline’s curtailment plan. It complains that the Commission’s refusal to impose an end-use plan with fixed historical base periods and volumetric limitations constitutes a departure from the Commission’s past policy without the requisite reasoned consideration explaining that departure.
In our judgment, GM’s contentions misconceive the Commission’s authority to conduct an investigation and misapprehend the import of its past policy statements. First, section 5(a) does not require the Commission to conduct a formal hearing into the lawfulness of a curtailment plan every time a party such as GM files a complaint. In general, an administrative agency’s decision to conduct or not to conduct an investigation is committed to the agency’s discretion. City of Chicago v. United States, 396 U.S. 162, 165, 90 S.Ct. 309, 24 L.Ed.2d 340 (1969); Kixmiller v. SEC, 160 U.S.App.D.C. 375, 379, 492 F.2d 641, 645 (D.C. Cir. 1974). If an agency considers all the relevant factors so that a court can satisfy itself that the agency has actually exercised its discretion, an agency’s decision to refrain from investigation is unreviewable. Union Mechling Corp. v. United States, 185 U.S.App.D.C. 57, 59, 566 F.2d 722, 724 (D.C. Cir. 1977). “If an agency simply ignores issues whose relevance to the public interest is obvious, the agency’s decision may be reversed.” Id. 185 U.S.App. [212]*212D.C. at 60, 566 F.2d at 725 (citing Michigan Consolidated Gas Co. v. FPC, 108 U.S.App. D.C. 409, 283 F.2d 204, 226 (D.C. Cir.), cert. denied, 364 U.S. 913, 81 S.Ct. 276, 5 L.Ed.2d 227 (1960)).
GM does not contend that the Commission ignored any factor relevant to its decisionmaking, and our own inspection of the record indicates that the Commission confronted the salient features of the GM complaint. For example, it considered GM’s charges concerning curtailments at GM’s Illinois plants and found that those curtailments were not attributable to any element of the curtailment plan.12 It also examined GM’s charges of a declining gas supply and found that these charges did not show the presence of an immediate and direct injury to GM which would warrant the relief GM requested. And the Commission explained that its policy statement was not a binding rule on every curtailment plan, but instead represented guidelines it would follow if it found a curtailment plan was indeed in violation of section 5(a). The Commission’s two orders reflect its assessment of the charges GM made in its complaint and the Commission’s consideration of the issues whose relevance to the public interest is obvious. We are satisfied that the Commission actually exercised its discretion to refrain from an investigation of the Pipeline plan. We therefore find that the Commission’s orders dismissing the GM complaint are not subject to review in this court.
Second, even if the orders were reviewable, we would be compelled to deny GM’s petition to set aside its orders. That a curtailment plan is not based on end-use does not render the plan a per se violation of section 5(a); the Commission’s policy statement “is merely an announcement to the public of the policy which the agency hopes to implement in future rulemakings or adjudications.” Pacific Gas & Electric Co. v. FPC, 164 U.S.App.D.C. 371, 376, 506 F.2d 33, 38 (D.C. Cir. 1974). The Commission imposes end-use plans and accompanying limitations after it finds upon investigation that a particular curtailment plan is unjust, unreasonable, or unduly discriminatory. See Sebring Utilities Commission v. FERC, 591 F.2d 1003,1009 (5th Cir. 1979). Curtailment plans must be tailored to fit the characteristics of individual pipelines. See FPC v. Louisiana Power & Light Co., 406 U.S. 621, 92 S.Ct. 1827, 32 L.Ed.2d 369 (1972). Although by no means dispositive, that a curtailment plan is the product of negotiation among pipeline customers who offer no objection to the plan strongly suggests that it is a balanced and workable product capable of meeting the needs of the parties it affects in a lawful manner. See Consolidated Edison Company of New York, Inc. v. FPC, 167 U.S.App.D.C. 134, 143, 511 F.2d 372, 381 (D.C. Cir. 1974).
GM’s basic complaint is that some of Pipeline’s customers can attach new loads. In light of the alleged shortage of natural gas, GM charges that these expansion policies will imperil its supply. This reasoning is unpersuasive. A curtailment plan is not designed to avoid natural gas shortages but to meet them. Pipeline’s curtailment plan allocates supplies among its major customers on the basis of a fixed Basic Annual Quantity not subject to increase on the basis of new attachments. This figure operates as the functional equivalent of a fixed historical base period. Thus NI-Gas and Peoples cannot rely on Pipeline to expand its high-priority markets, but must instead turn to self-help measures of their own. NI-Gas and Peoples’ use of such measures to pursue attachment policies is within the regulatory jurisdiction of the Illinois Commerce Commission, which has approved them. Assuming the Commission can even reach those measures, it is within its power to defer to the [213]*213decisions of state commissions when those decisions are not inconsistent with national policies. We think it is also reasonable for the Commission to have found that the ability of Pipeline’s smaller customers — who lack the flexibility to pursue alternative energy sources — to increase their entitlements under Pipeline’s plan represented a minimal strain on the plan’s capacity to limit market expansion.
Nothing in this opinion is intended to intimate any view on the lawfulness of Pipeline’s curtailment plan. We hold only that the Commission did not abuse its discretion in dismissing GM’s request for an investigation of that plan. The petition for review is denied. It is
So Ordered.