TERRY, Associate Judge:
Chesapeake and Potomac Telephone Company (C & P) appeals from an order entered by the Public Service Commission in one of two separate ratemaking proceedings. At issue is the portion of the Commission’s order which allocates between C & P and its ratepayers the cost of a double tax payment made by C & P pursuant to an amendment to the District of Columbia franchise tax act. The Commission allowed the payment to be recovered in its entirety by C & P from its ratepayers over a three-year period through a surcharge on C & P’s rates, but it denied C & P any recovery of interest on the payment. We find the Commission’s decision to be just and reasonable, and therefore we affirm it.
I
On March 15, 1983, C & P filed an application with the Commission, initiating Formal Case No. 798, for permanent changes in its rates. Some time thereafter the District of Columbia Council enacted a new tax on utilities, to take effect on July 1, 1983;1 On June 15, anticipating that the law would have its impact long before any relief could be granted for it in the general rate case, C & P filed an application for a separate ratemaking proceeding, which became Formal Case No. 806, to deal solely and quickly with the effect of the new law. After a public hearing on the impact of the new tax on C & P, the Commission issued its Order No. 7891 on September 29, 1983. The order allowed C & P to impose surcharges which would enable it to recover immedi[1169]*1169ately the added cost of complying with the new tax law, and also to recoup, over a period of three years without interest, the final tax payment it made under the prior law.2 C & P filed an application for reconsideration, contending that it should be allowed to recover from the ratepayers a sum equivalent to interest on its tax payment over the three-year period. On December 30, 1983, the Commission issued Order No. 7952 denying C & P’s request. From that denial C & P appeals.
II
Our review of a ratemaking order by the Commission “is the narrowest judicial review in the field of administrative law.” Potomac Electric Power Co. v. Public Service Commission, 402 A.2d 14, 17 (D.C.) (en banc) (citations omitted), cert. denied, 444 U.S. 926, 100 S.Ct. 265, 62 L.Ed.2d 182 (1979); accord, e.g., People’s Counsel v. Public Service Commission, 472 A.2d 860, 862 n.3 (D.C.1984). The responsibility for setting utility rates lies with the Commission, not with this court. D.C. Code §§ 43-501, 43-601, 43-611 (1981); D. C. Telephone Answering Service Committee v. Public Service Commission, 476 A.2d 1113, 1118 (D.C. 1984); People’s Counsel v. Public Service Commission, supra, 472 A.2d at 862; Washington Public Interest Organization v. Public Service Commission, 393 A.2d 71, 75 (D.C. 1978), cert. denied, 444 U.S. 926, 100 S.Ct. 265, 62 L.Ed.2d 182 (1979). To meet that responsibility, the Commission must “ar-riv[e] at a fair balance between competing consumer and investor interests.” People’s Counsel v. Public Service Commission, 399 A.2d 43, 45 (D.C.1979); see FPC v. Hope Natural Gas Co., 320 U.S. 591, 603, 64 S.Ct. 281, 288, 88 L.Ed. 333 (1944). In the Commission’s performance of its task, “[i]t is not theory but the impact of the rate order which counts. If the total effect of the rate order cannot be said to be unjust and unreasonable, judicial inquiry ... is at an end.” Id. at 602, 64 S.Ct. at 288, quoted in People’s Counsel v. Public Service Commission, supra, 472 A.2d at 862.
Any rate order of the Commission, as “the product of expert judgment,” is presumptively valid and will be reversed only upon a “convincing showing” that the Commission has failed to comply with the statutory criteria. FPC v. Hope Natural Gas Co., supra, 320 U.S. at 602, 64 S.Ct. at 287; see D.C. Telephone Answering Service Committee v. Public Service Commission, supra, 476 A.2d at 1119; People’s Counsel v. Public Service Commission, supra, 472 A.2d at 863; General Services Administration v. Public Service Commission, 469 A.2d 1238, 1241 (D.C. 1983). So long as the Commission’s order is within a “zone of reasonableness,”3 it is insulated from judicial review, provided that the Commission has carried its “burden of showing fully and clearly why it has taken the particular ratemaking action.” Washington Public Interest Organization v. [1170]*1170Public Service Commission, supra, 393 A.2d at 75; accord, e.g., D.C. Telephone Answering Service Committee v. Public Service Commission, supra, 476 A.2d at 1119; People’s Counsel v. Public Service Commission, supra, 472 A.2d at 863.
C & P’s principal contention is that the Commission is required by law to grant rate-base treatment for the unamortized interest on the tax payment made under the prior law.4 C & P relies on certain language in our decision in People’s Counsel v. Public Service Commission, supra, 399 A.2d at 46:
Utilities often experience cash flow problems because they bill for service after it is rendered. ... Included, therefore, in the rate base is an allowance for working capital so that the company can keep itself current in paying costs. Cash-working capital represents an amount which the company (investors) must supply from its own funds for the purpose of enabling it to meet current obligations as they arise due to the time lag between payment of expenses and collection of revenues.... If investors supply the funds for working capital, they are entitled to a return on these advances and this is accomplished by including the working capital requirement in the rate base. [Emphasis in original; citations omitted.]
Because gross receipts taxes are prepaid by utilities, the Commission may properly grant a working capital allowance for them. Washington Gas Light Co. v. Public Service Commission, 452 A.2d 375, 381 (D.C.1982), cert. denied, 462 U.S. 1107, 103 S.Ct. 2454, 77 L.Ed.2d 1334 (1983). But that does not mean that the Commission must grant such an allowance. C & P maintains that since its investors supplied the funds which enabled it to pay its taxes, the amount advanced by the investors should have been included as part of “the working capital requirement in the rate base.” It is beyond dispute, however, that “[a]n allowance by the Commission for cash-working capital is not guaranteed as a matter of course. The utility carries the burden of establishing the need for cash-working capital.” People’s Counsel v.
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TERRY, Associate Judge:
Chesapeake and Potomac Telephone Company (C & P) appeals from an order entered by the Public Service Commission in one of two separate ratemaking proceedings. At issue is the portion of the Commission’s order which allocates between C & P and its ratepayers the cost of a double tax payment made by C & P pursuant to an amendment to the District of Columbia franchise tax act. The Commission allowed the payment to be recovered in its entirety by C & P from its ratepayers over a three-year period through a surcharge on C & P’s rates, but it denied C & P any recovery of interest on the payment. We find the Commission’s decision to be just and reasonable, and therefore we affirm it.
I
On March 15, 1983, C & P filed an application with the Commission, initiating Formal Case No. 798, for permanent changes in its rates. Some time thereafter the District of Columbia Council enacted a new tax on utilities, to take effect on July 1, 1983;1 On June 15, anticipating that the law would have its impact long before any relief could be granted for it in the general rate case, C & P filed an application for a separate ratemaking proceeding, which became Formal Case No. 806, to deal solely and quickly with the effect of the new law. After a public hearing on the impact of the new tax on C & P, the Commission issued its Order No. 7891 on September 29, 1983. The order allowed C & P to impose surcharges which would enable it to recover immedi[1169]*1169ately the added cost of complying with the new tax law, and also to recoup, over a period of three years without interest, the final tax payment it made under the prior law.2 C & P filed an application for reconsideration, contending that it should be allowed to recover from the ratepayers a sum equivalent to interest on its tax payment over the three-year period. On December 30, 1983, the Commission issued Order No. 7952 denying C & P’s request. From that denial C & P appeals.
II
Our review of a ratemaking order by the Commission “is the narrowest judicial review in the field of administrative law.” Potomac Electric Power Co. v. Public Service Commission, 402 A.2d 14, 17 (D.C.) (en banc) (citations omitted), cert. denied, 444 U.S. 926, 100 S.Ct. 265, 62 L.Ed.2d 182 (1979); accord, e.g., People’s Counsel v. Public Service Commission, 472 A.2d 860, 862 n.3 (D.C.1984). The responsibility for setting utility rates lies with the Commission, not with this court. D.C. Code §§ 43-501, 43-601, 43-611 (1981); D. C. Telephone Answering Service Committee v. Public Service Commission, 476 A.2d 1113, 1118 (D.C. 1984); People’s Counsel v. Public Service Commission, supra, 472 A.2d at 862; Washington Public Interest Organization v. Public Service Commission, 393 A.2d 71, 75 (D.C. 1978), cert. denied, 444 U.S. 926, 100 S.Ct. 265, 62 L.Ed.2d 182 (1979). To meet that responsibility, the Commission must “ar-riv[e] at a fair balance between competing consumer and investor interests.” People’s Counsel v. Public Service Commission, 399 A.2d 43, 45 (D.C.1979); see FPC v. Hope Natural Gas Co., 320 U.S. 591, 603, 64 S.Ct. 281, 288, 88 L.Ed. 333 (1944). In the Commission’s performance of its task, “[i]t is not theory but the impact of the rate order which counts. If the total effect of the rate order cannot be said to be unjust and unreasonable, judicial inquiry ... is at an end.” Id. at 602, 64 S.Ct. at 288, quoted in People’s Counsel v. Public Service Commission, supra, 472 A.2d at 862.
Any rate order of the Commission, as “the product of expert judgment,” is presumptively valid and will be reversed only upon a “convincing showing” that the Commission has failed to comply with the statutory criteria. FPC v. Hope Natural Gas Co., supra, 320 U.S. at 602, 64 S.Ct. at 287; see D.C. Telephone Answering Service Committee v. Public Service Commission, supra, 476 A.2d at 1119; People’s Counsel v. Public Service Commission, supra, 472 A.2d at 863; General Services Administration v. Public Service Commission, 469 A.2d 1238, 1241 (D.C. 1983). So long as the Commission’s order is within a “zone of reasonableness,”3 it is insulated from judicial review, provided that the Commission has carried its “burden of showing fully and clearly why it has taken the particular ratemaking action.” Washington Public Interest Organization v. [1170]*1170Public Service Commission, supra, 393 A.2d at 75; accord, e.g., D.C. Telephone Answering Service Committee v. Public Service Commission, supra, 476 A.2d at 1119; People’s Counsel v. Public Service Commission, supra, 472 A.2d at 863.
C & P’s principal contention is that the Commission is required by law to grant rate-base treatment for the unamortized interest on the tax payment made under the prior law.4 C & P relies on certain language in our decision in People’s Counsel v. Public Service Commission, supra, 399 A.2d at 46:
Utilities often experience cash flow problems because they bill for service after it is rendered. ... Included, therefore, in the rate base is an allowance for working capital so that the company can keep itself current in paying costs. Cash-working capital represents an amount which the company (investors) must supply from its own funds for the purpose of enabling it to meet current obligations as they arise due to the time lag between payment of expenses and collection of revenues.... If investors supply the funds for working capital, they are entitled to a return on these advances and this is accomplished by including the working capital requirement in the rate base. [Emphasis in original; citations omitted.]
Because gross receipts taxes are prepaid by utilities, the Commission may properly grant a working capital allowance for them. Washington Gas Light Co. v. Public Service Commission, 452 A.2d 375, 381 (D.C.1982), cert. denied, 462 U.S. 1107, 103 S.Ct. 2454, 77 L.Ed.2d 1334 (1983). But that does not mean that the Commission must grant such an allowance. C & P maintains that since its investors supplied the funds which enabled it to pay its taxes, the amount advanced by the investors should have been included as part of “the working capital requirement in the rate base.” It is beyond dispute, however, that “[a]n allowance by the Commission for cash-working capital is not guaranteed as a matter of course. The utility carries the burden of establishing the need for cash-working capital.” People’s Counsel v. Public Service Commission, supra, 399 A.2d at 47 (citation omitted). In this case C & P failed to carry that burden. It offered no evidence before the Commission of its “need for cash-working capital,” and it has not shown that even with the relief granted by the Commission, it has been or will be unable to meet its current obligations as they come due.
Moreover, quite apart from C & P’s failure to establish its “need for cash-working capital,” it has also failed to carry its heavy burden of demonstrating that the overall impact of the Commission’s order is confiscatory. It is not enough for C & P to complain that no return of capital, in the form of interest, was provided in the surcharge. Since the object of any ratemaking proceeding is to achieve “a fair balance [1171]*1171between competing consumer and investor interests,”5 C & P must show that the “actual rate of return earned by [it] is so low as to deprive [it] of the opportunity to maintain its financial integrity, to attract necessary capital and to compensate investors fairly.” Potomac Electric Power Co. v. Public Service Commission, 457 A.2d 776, 788 (D.C.1983); accord, FPC v. Hope Natural Gas Co., supra, 320 U.S. at 603, 64 S.Ct. at 288. In other words, it is only the big picture that counts. Because C & P has not shown that the Commission’s order was outside the zone of reasonableness or jeopardized its financial integrity, we must affirm that order, provided of course that it is adequately explained.
Although we will not set aside a rate order unless the party challenging it makes a “convincing showing” that it is unreasonable, unjust, or discriminatory, at the same time we cannot approve a rate order unless the Commission has fully and clearly explained why it has entered the particular order under review. People’s Counsel v. Public Service Commission, supra, 472 A.2d at 862-863; Washington Public Interest Organization v. Public Service Commission, supra, 393 A.2d at 75-79. The nature of the explanation, however, will vary from case to case. In rate proceedings separate from a general rate case, in which the scope is narrow, quick action is essential, and the record is necessarily less comprehensive, the Commission is “not required to make the full and complete findings ... that must accompany an exercise of its authority to prescribe permanent rates.” Payne v. Washington Metropolitan Area Transit Commission, 134 U.S.App.D.C. 321, 327, 415 F.2d 901, 907 (1968); see Potomac Electric Power Co. v. Public Service Commission, supra, 457 A.2d at 784; cf. Potomac Electric Power Co. v. Public Service Commission, 455 A.2d 374, 379 n.8 (D.C.1982). Moreover, it is entirely proper for the Commission in such cases to rely on findings made in the separate general rate case. See Potomac Electric Power Co. v. Public Service Commission, supra, 457 A.2d at 781 n.4; cf. D.C. Telephone Answering Service Committee v. Public Service Commission, supra, 476 A.2d at 1125 (the Commission’s explanation of its decision was sufficient “when read in conjunction with previous telephone rate orders”).
In this case the Commission noted that the “double-up” in tax payments was an “extraordinary event” for which “neither C & P nor its ratepayers bear the blame.” Order No. 7952 at 24. It found that the impact on C & P of its order allocating the cost of the tax between C & P and its customers was not as significant as it might seem to be at first blush.6 The Commission concluded that the effect of its order was to lessen “the immediate impact on the ratepayers, while at the same time allowing the Company to recoup its prepayment in a timely manner.” Order No. 7891 at 5 n.6. In other words, the order was designed to meet the Commission’s responsibility of achieving “a fair balance between competing consumer and investor interests.” People’s Counsel v. Public Service Commission, supra, 399 A.2d at 45. We are satisfied that the Commission’s explanation of the reasons behind its order is sufficient to meet the demands of the case law, which exist, after all, simply to ensure an adequate basis for judicial review. See Permian Basin Area Rate Cases, 390 U.S. 747, 792, 88 S.Ct. 1344, 1373, 20 L.Ed.2d 312 (1968); Washington Public Interest [1172]*1172Organization v. Public Service Commission, supra, 393 A.2d at 75-79.
Affirmed.