The opinion of the court was delivered by: Ricardo M. Urbina United States District Judge
GRANTING THE PLAINTIFFS'MOTION FOR LEAVE TO SUPPLEMENT THE COMPLAINT
The action is before the court on the plaintiffs' motion to supplement their complaint, adding three claims and seven plaintiffs. The Fish and Wildlife Service and the defendant-intervenors (collectively "the defendants") oppose the plaintiffs' proposed supplement due to the delay it will impose on the proceedings. Because the judicial interest in addressing all the legally similar claims together outweighs any prejudice the defendants may suffer, the court grants the plaintiffs' motion to supplement.
II. FACTUAL & PROCEDURAL BACKGROUND
A detailed factual background has been recited in previous iterations of this case, and the following is a summary of only the most recent proceedings. On August 31, 2006, the court issued a memorandum opinion granting the plaintiffs' motion for summary judgment. Mem. Op. (Aug. 31, 2006). Specifically, the court determined that the Fish and Wildlife Service did not analyze the cumulative impacts of six agency rules. Id. at 8-14. In light of the court's determination, the defendants committed to completing "new environment analysis . . . by May 30, 2007." Defs.' Supplemental Brief (Oct. 5, 2006) at 4. After the defendants completed the analysis and while the production of the administrative record containing this new analysis was pending, the plaintiffs filed a motion requesting that the court permit the plaintiffs to challenge three additional rules and add seven plaintiffs. The defendants oppose the plaintiffs' request, and the court now turns to this pending motion.
A. Legal Standard to Supplement a Pleading Pursuant to Rule 15(d)
Rule 15(d) authorizes the court, "upon reasonable notice and upon such terms as are just," to permit a party to serve a supplemental pleading setting forth events which have happened since the date of the original complaint. FED. R. CIV. P. 15(d). The "basic aim of the rules [is] to make pleadings a means to achieve an orderly and fair administration of justice." Gomez v. Wilson, 477 F.2d 411, 417 (D.C. Cir. 1973) (quoting Griffin v. County School Bd., 377 U.S. 218, 227 (1964)). Supplements under Rule 15(d) always require leave of the court, and the court has broad discretion in determining whether to allow supplemental pleadings in the interests of judicial economy and convenience. United States v. Hicks, 283 F.3d 380, 385 (D.C. Cir. 2002); Miller v. Air Line Pilots Ass'n Int'l, 2000 WL 362042, at *1 (D.D.C. Mar. 30, 2000). Although "the circumstances under which supplements may relate back have not been codified," courts often apply the relation-back principles of 15(c) to supplemental pleadings. Hicks, 283 F.3d at 385.
B. The Court Grants the Plaintiffs' Motion for Leave to Supplement the Complaint
By bringing on board seven plaintiffs and three claims to their ongoing odyssey of litigation, the plaintiffs contend that the supplemental claims will aid in the speedy and efficient resolution of the controversy. Pls.' Mot. at 5. This will be done, the plaintiffs assert, because the added claims are not materially different from those already before the court, and addressing all of the claims together saves judicial resources from being diverted to a second lawsuit. Id. at 5-6. In addition, the plaintiffs note that the request is not unduly delayed because the defendants have not yet produced the administrative record nor filed renewed motions for summary judgment. Id. at 7. Finally, the plaintiffs assert that the defendants will not suffer undue prejudice because they would still have to produce the administrative record if the plaintiffs were to challenge the three additional rules in a separate lawsuit. Id. at 3. Moreover, the effects of delaying the final resolution of the claims by supplementing the complaint do not amount to actual prejudice,*fn1 id. at 7.
The defendants insist that adding three additional claims will delay production of the administrative record by at least 8 months and, even if the claims are added, further litigation will be necessary because the new plaintiffs lack standing to bring the supplemental claims. Defs.' Opp'n at 3, 6; Def.-Intervenors' Opp'n at 3-6. They further allege that the plaintiffs will not be prejudiced by excluding the supplemental claims because "the current complaint will have direct legal bearing on the three additional rules." Defs.' Opp'n at 7; Def.-Intervenors' Opp'n at 7 (alleging that "plaintiffs' proposed supplemental challenges . . . may be mooted by the resolution of the original action"). The defendants contend that they, on the other hand, will suffer prejudice by adding the additional claims, resulting in "another protracted period of litigation," Defs.' Opp'n at 5, that "hampers [their] ability to plan and manage the refuge system, and in particular, all types of recreational activities that might be authorized on any refuge," id. at 7-8.
As an initial matter, the court should not deny supplementing a complaint based solely on the time elapsed between the filing of the complaint and the request for leave to supplement. See Atchinson v. District of Columbia, 73 F.3d 418, 426 (D.C. Cir. 1996). Although four years has passed since the plaintiffs filed their original complaint, the defendants have not yet filed the administrative record for the parties' anticipated renewed filing of summary ...