OPINION1
MEROW, Senior Judge.
In Yankee Atomic Electric Co. v. United States, 536 F.3d 1268 (Fed.Cir.2008) (‘‘Yankee II ”) the United States Court of Appeals for the Federal Circuit affirmed-in-part and reversed-in-part this court’s findings and conclusions in Yankee Atomic Electric Co. v. United States, 73 Fed.Cl. 249 (2006) (“Yankee I”). The Court remanded the case, requiring a reassessment of causation using the 1987 Annual Capacity Report (“ACR”) acceptance rate for the reraeking and dry storage costs awarded to plaintiffs. Remand proceedings, including briefing and oral argument, are completed.
Familiarity with the development of the Standard Contract between the government and nuclear utilities, and the firmly-established government liability for partial breach, is presumed. Me. Yankee Atomic Power Co. v. United States, 225 F.3d 1336 (Fed.Cir.2000).2 In the initial six-week trial on damages held in August of 2004, the Yankees3 [684] presented both past and future costs of mitigating and providing a substitute performance for the contract services the government failed to supply. After trial covering both past and future costs, but before the Opinion was issued, the ruling in Indiana Michigan Power Co. v. United States, 422 F.3d 1369 (Fed.Cir.2005) confined partial breach claims under the Standard Contract to past but not future expenses. Supplemental briefing in Yankee I served to segregate future costs, thus limiting the Opinion to actual costs incurred for Yankee Atomic and Connecticut Yankee through 2001, and through 2002 for Maine Yankee.
In Yankee 1, Yankee Atomic was awarded $32,863,366 — the amount spent to build dry storage — an independent spent fuel storage installation (“ISFSI”) that the court found would not have been built and the costs incurred if the government had timely performed its contract obligation to remove spent nuclear fuel (“SNF”) and high-level waste (“HLW”) at any reasonable acceptance rate. Connecticut Yankee was awarded $8,350,893 for reracking its wet pool to increase storage capacity and $25,803,986 for ISFSI construction as neither the project nor the costs thereof would have been necessary if the government had timely performed at any reasonable removal rate. Maine Yankee was awarded $10,069,018 in reracking costs and $65,705,536 in ISFSI construction expenses which would not have been incurred had the government performed its contractual removal obligations. Yankee I, 73 Fed.Cl. at 326. The court rejected the government’s position that Greater-Than-Class-C radioactive waste (“GTCC”) was not covered by the Standard Contract so that its presence would have required the Yankees to build dry storage for it in the non-breach world, and the ISFSI costs, or some portion of the costs, would have been incurred in any event. Id. at 312-15. The court also rejected as premature the government’s proposed offset for Maine and Connecticut Yankees’ Nuclear Waste Fund (“NWF”) fees that, under the terms of the Standard Contract, are not due to be paid until DOE first begins to remove the utilities’ SNF. Id. at 325.
On appeal to the Federal Circuit, the government argued that: (1) the Yankees failed to establish a realistic non-breach world against which to determine whether actual costs would have been incurred regardless of breach; (2) the awards of pre-breach rerack-ing costs to Maine Yankee and Connecticut Yankee incurred prior to January 31, 1998, conflicted with Indiana Michigan, their decisions to rerack were not caused by DOE’s announced delays and were not reasonable; (3) the Standard Contract was wrongly construed to include removal of GTCC; and (4) deferred NWF fees should have been deducted from costs awarded to Maine Yankee and Connecticut Yankee.
The Yankees responded that the court did make non-breach world findings, concluding that if DOE had performed at any reasonable rate, the dry storage and reracking costs awarded would not have been incurred; pre-breach reracking costs were properly awarded; there was no error in construing the Standard Contract to encompass GTCC; the parties intended that the Yankees’ GTCC would be removed with their SNF; and the NWF fees not due until DOE first performs were deferred, not avoided costs.
Yankee II confirmed that DOE’s failure to begin performance prior to January 31,1998, was a partial breach of contract, and addressed the award of damages for incremental costs, affirming Yankee I’s findings on foreseeability, reasonable certainty and the use of the substantial causal factor standard to determine causation for those costs, 536 F.3d at 1272-73. Yankee I's conclusion that the NWF fees of Maine Yankee and Connecticut Yankee were not appropriate deductions from damages, but would be due when DOE first arrived at the respective utility site and removed SNF, was also affirmed. This court was instructed on remand to apply the 1987 ACR acceptance rates to assess causation for the ISFSI and reracking costs awarded. These costs are compared with hypothetical non-breach world costs avoided because of the breach, to determine the net or incremental costs caused by the government’s partial breach. “Without record evidence about the Yankees’ condition with full Government performance, the Court of Fed-[685] era] Claims could not perform the necessary comparison between the breach and non-breach worlds and thus could not accurately assess the Yankees’ damages.” Id. at 1273 (citations omitted). “ICjausation for the Yankees’ storage expenditures depended on some comparison of the contractually-defined hypothetical world to the expenses actually incurred.” Id. at 1274.
The Federal Circuit in a second SNF ease issued on the same day as Yankee II, selected the non-breach world, concluding that the 1987 ACR4 process “provides the best available pre-breach snapshot of both parties’ intentions for an acceptance rate.” PG & E v. United States, 536 F.3d 1282, 1292 (Fed.Cir. 2008) (“PG & E II”). In PG & E II, the Federal Circuit rejected the 1991 ACR acceptance rate advanced by the government because it was “tainted” by the impending breach. Id. (explaining that “[ajfter the 1987 Amendments Act, breach became highly likely or inevitable because of the strict linkage requirements. Later ACS reports became tainted by the impending breach and even impending litigation strategies.”). By 1991, “DOE’s timely performance of its full contractual obligations had, by then, already become a distant possibility.” Id. at 1291. Instead, the Federal Circuit instructed that: “Ltjhe most accurate picture of the parties’ intent for this contract is their conduct at a time when both parties still anticipated timely and full performance of the contract,” id. at 1290-91, and in 1987, for the most part, “both the DOE and the nuclear utilities realistically expected that DOE would accept SNF/HLW on schedule.” Id. at 1291. Accordingly, consideration of post-contract formation conduct and intentions is appropriate.
Because this court relies on this post-formation conduct to interpret the contract itself, the most accurate picture of the parties’ intent for this contract is their conduct at a time when both parties still anticipated timely and full performance of the contract. See Julius Goldman’s Egg City v. United States, 697 F.2d 1051, 1058 (Fed.Cir.1983) (per curiam) (“A principle of contract interpretation is that the contract must be interpreted in accordance with the parties’ understanding as shown by their conduct before the controversy.” (citing Macke Co. v. United States, 199 Ct.Cl. 552, 467 F.2d 1323, 1325 (1972))); Macke, 467 F.2d at 1325 (“[HJow the parties act under the arrangement, before the advent of controversy, is often more revealing than the dry language of the written agreement by itself.”).
PG & E II, 536 F.3d at 1290-91. See also Yankee II, 536 F.3d at 1278 (citing post-contracting evidence of the parties’ actions and intentions).
The court concludes that in the non-breach world of full government performance at the 1987 ACR removal rates, neither Yankee Atomic, Maine Yankee nor Connecticut Yankee would have built dry storage, and neither [686] Maine Yankee nor Connecticut Yankee would have reracked. Accordingly, the breach world mitigation costs awarded and affirmed as to reasonableness and foreseeability in Yankee II would not have been incurred in this non-breach world, and their award to the respective Yankees as modified in this Opinion, would not place them in a better position than if the government had not partially breached. Other matters raised by the parties, assertedly beyond the scope of the mandate, are separately addi’essed.
I. Background
From prior opinions in this matter familiarity with the historical and statutory background of the government’s responsibility for SNF disposal is presumed. Briefly, nuclear fuel in the core of civilian nuclear power reactors eventually becomes relatively inefficient for producing heat to create the steam that powers the turbines to generate electricity. About every eighteen months, some of the fuel assemblies that contain the nuclear fuel are removed from the reactor core and placed in a specialized spent fuel pool filled with treated water. New fuel is placed in the reactor.
Spent fuel pools are equipped with racks that hold submerged assemblies in vertical sleeves. When constructed, the Yankees’ wet pools were sized to hold a relatively limited number of assemblies for temporary storage pending removal for reprocessing. Yankee Atomic I, 73 Fed.Cl. at 252. After reprocessing was banned, necessary refueling caused spent fuel pools to approach maximum storage capacity. With regulatory approval, the storage capacity of a wet pool can be increased by “reracking” — replacing original racks with higher density arrays. Id. Through spent fuel management and technological advances, the number of fuel assemblies removed as spent has decreased and refueling intervals have increased, both of which extend the time before a pool reaches capacity. If a nuclear power plant does not have space in its pool to discharge spent fuel from the core, the plant can no longer produce power. Generally, alternative power from non-nuclear sources is more costly.
Ml three Yankees are shut-down plants. Their reactors and SNF wet pools have been dismantled and the sites remediated. Ml that remains on the three sites are their “dry” storage facilities — the ISFSIs. The ISFSIs hold enormous concrete casks placed on an approximately 225 feet by 86 feet, 2-foot thick concrete pad. Yankee I, 73 Fed. Cl. at 285 n. 39. Record evidence speaks to the efforts undertaken to construct ISFSIs, acquire casks to store the SNF safely and transfer SNF from the pool to the ISFSI, all of which requires regulatory approval and oversight. ISFSIs are expensive to construct and load with SNF. This process requires a substantial diversion of the utilities’ internal labor. While dry storage has significant upfront and loading costs, once completed, dry storage is relatively passive with lower operation and maintenance (“0 & M”) costs. Accordingly, dry storage becomes a less costly alternative to wet pool storage the longer the anticipated storage period. The length of storage time contemplated prior to DOE’s actual commencement of SNF removal was a substantial factor in the Yankees’ decisions to build dry storage. Yankee I, 73 Fed.Cl. at 293, 294-95.
As shut-down plants, the Yankees differ materially from most other utilities in pending SNF cases. While operating reactors require ever-increasing storage space for SNF removed from the reactor and replaced with fresher, more efficient fuel, shut down plants have fixed amounts of SNF to store; accordingly, for storage options consideration is given to 0 & M costs as opposed to increasing storage space.
II. Causation for dry storage costs awarded
The government concedes that certain costs awarded in Yankee I are incremental— that is some of the costs the Yankees spent in the breach world would not have been spent in the non-breach world with full DOE performance at the removal rates of the 1987 ACR. The government contends that Yankee Atomic would have built a smaller ISFSI and loaded fewer casks at a cost of $20,539,604, which subtracted from the $32,866,088 in awarded breach world ISFSI and cask costs, [687] results in conceded incremental damages for Yankee Atomic of $12,326,484. (Def.’s Resp. to Pis.’ Post-Trial Br. [1018] at 123.)
The government asserts that Connecticut Yankee would have built a smaller ISFSI and purchased and loaded fewer casks, at a cost of $11,168,449, which subtracted from the $34,154,879 in breach world ISFSI and cask costs, and after subtracting $709,837 in AFUDC expenses included in that amount (a reduction advocated initially on remand as discussed hereinafter), results in conceded incremental damages for Connecticut Yankee of $22,276,593. (Id.)
The government hypothesizes that Maine Yankee would have built a smaller ISFSI and purchased and loaded fewer casks, at a cost of $34,906,066, which subtracted from the $75,774,554 in actual ISFSI costs in the breach world awarded in Yankee I, and after deducting $10,069,018 in reracking costs included in the award in Yankee I (but which the government contends Maine Yankee would have incurred in this non-breach world) results in conceded net or incremental damages of $30,799,470. (Id.)
In sum, on remand, the government admits that with the Yankees’ removal allocations in the 1987 ACR, total aggregate incremental damages are $65,402,547. (Id.)
Relying at least in part on the expert opinion of Mr. Frank Graves, the Yankees contend that in the non-breach world they would have increased their 1987 ACR removal allocations using the Standard Contract’s exchanges provision, and by doing so would have emptied their pools in a relatively short period of time, would not have built dry storage and would not have reracked. As no dry storage costs or reraeking costs would have been incurred in the non-breach world, the Yankees conclude, the dry storage costs awarded in Yankee I, the foreseeability and reasonable certainty having been affirmed, were and are appropriate, and awards of those amounts would not place them in a better position than if the breach had not occurred.
The government disagrees, arguing vigorously that the Yankees’ exchange-based non-breach world is speculative and not consistent with the Standard Contract.
a. DOE added the exchanges provision to the Standard Contract at the utilities’ request
A contract provision to allow utilities to exchange DCSs was added by DOE following the February 4, 1983 publication of a proposed form contract in the Federal Register and a brief comment period.5 (PX 31 at 1.) DOE’s Memorandum approved by Energy Secretary Donald Paul Hodel on April 11, 1983, contemporaneously with contract formation, reported that DOE acceded to the utilities’ request for “exchange” rights.
The majority of the utilities commented that they should have “exchange” or “swapping” rights to ship their SNF and/or HLW to our repository. After consideration, aside from some complex record keeping, this poses no great problem to us, and consequently, we have accepted this suggestion. It will require our approval, and we intend to be reasonable.
(PX 30, Tab D at ZAB-001-0899.)
The Exchanges section provides:
Purchaser6 shall have the right to exchange approved [DCSs] with parties to other contracts with DOE for disposal of SNF and/or HLW; provided, however, that DOE shall, in advance, have the right to approve or disapprove, in its sole discretion, any such exchanges.
48 Fed.Reg. 16590-01, 16601 (April 8, 1983) (footnote added).
The published commentary to the final contract explained that this provision was added because of numerous comments to the published initial draft, to allow utilities flexibility in managing their spent fuel inventory. It was one of the few comments adopted by DOE.
This new provision allows Purchasers to exchange DOE-approved delivery commitments with one another, subject to DOE approval. While this procedure will allow [688] the Purchaser greater flexibility in arranging its inventory of spent fuel and delivery thereof, all SNF and/or HLW to be delivered must comply with the requirements of the contract regarding acceptability.7
Id. at 16592 (footnote added).
The Federal Circuit noted that “[t]he Standard Contract also included provisions setting priority for acceptance of waste (generally through an oldest fuel first (OFF) scheme) and allowed utilities to swap approved delivery commitment schedules (the Exchanges provision).” PG & E II, 536 F.3d at 1285.
b. Expert opinion of economist Frank Graves
Relying in part on exchanges, economist and expert witness, Mr. Frank Graves,8 who testified at the original and remand trials, analyzed the Yankees’ allocations under the 1987 ACR and the inter- and intra-utility markets for approved DCSs that would have developed in the non-breach world. Mr. Graves concluded that utilizing exchanges, including buying and selling allocations, each of the Yankees would have removed all of their SNF and HLW from their wet pools in the first ten years of DOE’s performance. In the non-breach world, Yankee Atomic’s pool would have been empty by 1999; Connecticut Yankee’s by 2002; and Maine Yankee’s by 2004. (Rem. Tr. [1001] 72:3-13 (Graves).)
Under the Standard Contract, a utility would receive an allocation for each year in weight (metric tons of uranium (“MTIJ”)) and number of assemblies. This allocation was obtained from an industry-wide ordinal ranking of SNF by age, based on the date of discharge of that weight and number of assemblies from the reactor. The allocation was set forth on an oldest fuel first (“OFF”) basis. From publieally available data, many utilities that either had enough room in their wet pool for additional SNF or for other reasons would not face a need for immediate removal of SNF could be identified. Instead of exercising its allocations, the utility could sell or “exchange” allocations it obtained by having old SNF to other utilities that did not have sufficient pool space and consequently, were facing substantial costs to build dry storage to accommodate SNF in excess of the utility’s storage capacity. To avoid dry storage cost this “must move” SNF would provide the incentive for the utility to buy an early removal allocation from another utility. Thus, through exchanges of approved allocations, a utility seeldng to avoid the costs of additional SNF storage could advance its place in the queue and accomplish that goal.
It is likely that revenue from an allocation market which could reduce costs to the benefit of ratepayers, would be attractive to utility regulators and consumer advocacy groups, and a market would have developed in the non-breach world with full government performance at the 1987 ACR rates. The tension or interaction in the non-breach world between the potential cost avoidance of utilities facing additional storage needs, and possible revenue realization potential for utilities [689] that had more than sufficient room, would have created this market for purchase and sale of allocations. The court credits testimony of utility preference for creative markets, a factor noted by Mr. Graves and supported by witness testimony. (Rem. Tr. L1001J 80:19-80:8 (Graves); 258:19-259:16 (Davis);9 [1005] 45:11-47:05 (Thomas)10 (describing inter-utility cooperation to save costs, coordination of timing of outages and sharing equipment).)11 See 73 Fed.Cl. at 303-06 (discussing witness testimony, evidence and case law recognition of robust inter-utility markets in regulatory-based environments).
Mr. Graves’ expert opinion on exchanges was twice recently credited as support for conclusions that in the non-breach world of the 1987 ACR rates with exchanges, those nuclear utilities would have emptied their spent fuel pool in 1998 and avoided dry storage costs expended in the breach world. In PG & E III, the court ruled:
On remand, the Federal Circuit instructed this court “to calculate the damages owed to PG & E lor DOE’s partial breach of the Standard Contract on th[e] basis [‘that the Standard Contract required DOE to accept SNF/HLW in accordance with the 1987 ACLS] process’].” PG & E II, 536 F.3d at 1292. In the court’s view, the establishment of the rate of acceptance and the admonition to consider evidence of the parties’ conduct and intentions in 1987 greatly reduced the uncertainty in Mr. Graves’ model, such that his testimony regarding the market for exchanges was helpful to the court in its resolution of this case on remand. When the parties’ behavior and intentions are considered from the perspective that, in 1987, the nonbreach world operates on the assumption of performance by DOE in accordance with the terms of the Standard Contract and the ACS process, Mr. Graves’ testimony is not speculative, but rather provides a reasonable description of a readily imaginable [690] part of the business environment in which PG & E would have been functioning during the eleven years between 1987 and 1998 as it anticipated the pickup of its fuel at Humboldt Bay. Further, the Federal Circuit has instructed that “parties to a contract agree to perform fully, not partially,” -id., so that, in the nonbreach world, PG & E is entitled to the benefits of full government performance under the Standard Contract, including the exchanges provision. As described more particularly below, the preponderance of the credible evidence adduced at the remand trial indicates that a market would have developed around the exchanges provision of the Standard Contract and that PG & E would have used the exchanges provision to avoid SAFSTOR costs in 1999 at its Humboldt Bay power plant.
92 Fed.Cl. at 184-85.
Dairyland Power Cooperative v. United States, 90 Fed.Cl. 615 (2009) made similar findings, also crediting Mr. Graves’ expert opinion on exchanges resulting in DOE removing all SNF from that utility by the end of 1998.
Notwithstanding flaws going to the precision of Mr. Graves’s results, Dairyland proffered convincing testimony that it probably would have advanced to the front of the queue and been out of SNF in 1998. Although the Government revealed flaws in Dairyland’s expert’s study casting some doubt on the precision of its calculations, the Government did not effectively counter Dairyland’s ease regarding exchanges. The Court finds that Dairyland has proven by a preponderance of the evidence that it would have utilized exchanges and had its SNF removed by DOE by the end of 1998.
90 Fed.Cl. at 634-35.
Earlier in Tennessee Valley Authority v. United States, 69 Fed.Cl. 515 (2006), crediting exchanges as well as other possibilities, the court concluded that TVA would not have built dry storage in the absence of government delay even though TVA’s OFF allocations would not have been sufficient to alleviate storage shortages.
That a market would develop around the exchange provision of the Standard Contract is supported by experience with other regulatory-based exchange arrangements, including those associated with environmental emissions programs under the Clean Air Act ... Tellingly, it is significantly less speculative that a market would develop around the SNF-exchange provision in the Standard Contract than that government’s overall mitigation-limiting scenario would actually unfold.
69 Fed.Cl. at 533.
The Federal Circuit did not disturb Yankee I’s conclusion that exchanges would have occurred in the non-breach world, and the government does not argue that exchanges would not have occurred “at some point and in some fashion.” (Def.’s Resp. to Pis.’ Posb-Trial Br. [1018] at 43.) The court already ruled that in the non-breach world, DOE, in removing SNF from utilities, would not have followed the OFF procedure used for assigning yearly weight allocations. Instead, exchanges would have occurred, once allocations were approved, that would have enabled the Yankees to accelerate the removal of their spent fuel. 73 Fed.Cl. at 303. The Federal Circuit’s mandate that any non-breach world costs be determined using the 1987 ACR acceptance rates and full government performance did not overturn or otherwise disturb this court’s prior conclusions on exchanges. 536 F.3d at 1274. Moreover, in PG & E II, while the Federal Circuit deferred to that trial court’s discretion in then excluding Mr. Graves’ testimony, it had “no difficulty” with the undersigned’s decision to qualify Mr. Graves. Id. at 1292. If the exchange provision was meaningless, expert testimony in this regard would have been irrelevant.
Cost data is transparent and publically available. Appendix B to the 1987 ACR, listing SNF by discharge date, was based on data from utilities’ publically available 1985 Nuclear Data Forms RW-859. Discharge dates thereafter were based on DOE’s projections. In the non-breach world, DOE would have had actual data which would have been included in subsequent ACRs. (PX 52 at PA-103128.)
[691] Accordingly, with one exception, Mr. Graves used actual data from NAC International, mostly identical to actual discharge data contained in the 2004 APR/ACR to determine priority rankings of the industry. That data was used in Dairyland, and PG & E III.