OPINION
On May 13, 2010, relator, BP Oil Supply Company, filed a petition for writ of mandamus in this court. See Tex. Gov’t Code Ann. § 22.221 (Vernon 2004); see also Tex. R.App. P. 52. In the petition, BP asks this court to compel the Honorable Alexandra Smoots-Hogan, presiding judge of the 164th District Court of Harris County, to set aside her order denying BP’s motion to dismiss, or in the alternative, to stay. We conditionally grant the petition.
I
The underlying dispute relates to a buy-sell agreement 1 between BP and the real party in interest, ConocoPhillips Company. The agreement required BP to deliver 54,-000 barrels per day of Heavy Louisiana Sweet crude oil to ConocoPhillips in Empire, Louisiana, and required ConocoPhil-lips to deliver 54,000 barrels per day of West Texas Intermediate crude oil to BP in Cushing, Oklahoma. Due to Hurricanes Gustav and Ike, BP failed to deliver the required volumes of crude oil to Conoco-Phillips in August and September 2008. Instead, BP made its August and September deliveries in November 2008. Conoco-Phillips then paid the November 2008 price for the delayed deliveries, rather than the August and September 2008 prices. BP alleges that because the market price dropped significantly between August and November 2008, ConocoPhil-lips’ refusal to pay the August and September 2008 prices damaged BP in the amount of more than $50 million. Conoco-Phillips, on the other hand, asserts that paying the August and September 2008 prices would have resulted in a windfall to BP.
The parties unsuccessfully mediated their dispute before either filed suit. At 12:02 p.m. (CST), on November 4, 2009, BP filed a breach-of-contract action against ConocoPhillips in Delaware state *918 court, seeking more than $50 million in damages. That same day, at 5:40 p.m. (CST), ConocoPhillips filed a declaratory-judgment action in the 164th District Court in Harris County seeking a declaration that it did not breach the buy-sell agreement and asserting a claim for breach of the duty of good faith and fair dealing.
On November 2, ConocoPhillips moved to dismiss or, alternatively, to stay the Delaware case for forum non conveniens. BP filed its own motion to dismiss or, alternatively, to stay the Texas case on December 7.
The hearing in the Delaware case took place on January 12, 2010; on February 25, the Delaware court denied ConocoPhil-lips’ motion to dismiss.
See BP Oil Supply Co. v. ConocoPhillips Co.,
C.A. No. N09C-11-028,
At a scheduling conference on April 12, the Delaware court entered an order setting its case for trial on March 21, 2011. The Texas trial court also issued a docket control order on April 12 setting its case for trial on November 1, 2010.
II
To be entitled to the extraordinary relief of a writ of mandamus, the relator must show that the trial court abused its discretion and there is no adequate remedy by appeal.
In re Laibe Corp.,
Abuse of Discretion
BP argues that the trial court abused its discretion by denying BP’s motion because principles of comity require deference to the first-filed Delaware case and that the later-filed Texas case be stayed. “Our federal system benefits from a measure of state-to-state comity, which, while not a constitutional obligation, is a ‘principle of mutual convenience whereby one state or jurisdiction will give effect to the laws and judicial decisions of another.’ ”
In re AutoNation, Inc.,
The mere pendency of. a prior suit in one state cannot be pleaded in abatement or in bar to a subsequent suit in Texas, even though both suits are between the same parties and involve the same subject matter.
In re State Farm Mut. Auto. Ins. Co.,
When a matter is first filed in another state, the general rule is that Texas courts stay the later-filed proceeding pending adjudication of the first suit.
In re AutoNation, Inc.,
A resolution of the abuse-of-discretion question demands a close inspection of the two pending actions.
In re State Farm Mut. Auto. Ins. Co.,
Here, the Delaware case was filed first. The two cases involve the same parties, the same subject matter, and same contract, implicating the Uniform Commercial Code. The Delaware court was the first to exercise jurisdiction over the parties and subject matter of this ease. A judgment in the Texas case would render the Delaware court’s order denying ConoeoPhillips’ motion to dismiss moot. Moreover, because of the earlier trial setting, the Harris County trial court will likely try the underlying case first, and BP’s choice of forum will be lost.
ConoeoPhillips argues that a Texas court should extend comity to another state only when the other state would do the same for Texas. Under the principle of mutual convenience, Texas will rec
*920
ognize the laws and judicial decisions of other states, expecting that those states will extend Texas the same consideration.
K.D.F. v. Rex,
Under Delaware law, where one of two competing actions is filed before the other, the first-filed action is generally entitled to preference.
2
However, where two cases are filed within a short time of each other Delaware does not apply a first-filed preference, but instead treats them as contemporaneously filed for purposes of forum non conveniens.
3
In this case, the Delaware court found that the two actions were contemporaneously filed and considered ConocoPhillips’s motion to dismiss under the doctrine of forum non conve-niens.
4
BP Oil Supply Co.,
ConocoPhillips contends that, under the unique facts of this case, Delaware would not extend comity to Texas if the Texas case had been filed a few hours earlier than the Delaware case because the cases would be considered contemporaneously filed, and the Delaware court would then address the motion to dismiss or stay as a matter of forum non conveniens. Therefore, according to ConocoPhillips, the Texas trial court reached the same decision that the Delaware court would have reached had the situation been reversed.
But for the trial court to refuse to extend comity, it must find a “clear indication” that Delaware is not a cooperative jurisdiction. K.D.F., 878 S.W.2d at 595. There is no such “clear indication” in the record below. Extending comity to Delaware to try the breach of contract case would not violate Texas policy. To the contrary, extending comity to Delaware by staying the Texas case advances Texas public policy because it adheres to our well-established first-filed rule. We recognize that we would face a more difficult dilemma if the Texas case had been filed first; it is not clear that Delaware would have extended comity in that situation. But we do not encounter that problem under these facts.
Moreover, ConocoPhillips’ non-liability declaratory-judgment action is merely a mirror-image of the Delaware breach-of-contract action. Texas public policy does not favor the pursuit of a declaratory action when a previously filed liability action already addresses the same issues. “An action for declaratory judgment will not be entertained if there is pending, at the time it is filed, another action or proceeding between the same parties and in which may be adjudicated the issues involved in the declaratory action.”
Tex. Liquor Control Bd. v. Canyon Creek Land Corp.,
ConocoPhillips contends that Texas courts disfavor declaratory-judgment actions in tort cases, not in breaeh-of-con-tract cases where there is no “real” plaintiff.
See MBM Fin. Corp. v. Woodlands Operating Co., L.P.,
[T]he “real plaintiff’ and the “traditional right to choose the time and place of suit” are materially different in contract and tort cases. The “real” plaintiff in a tort action is the injured party, yet both parties often suffer injury if a contract collapses. When each party claims the other breached (as is usually the case), it is hard to say who ought to be the “real” plaintiff. Here, for example, why should *922 MBM get to choose the time and place of suit rather than Woodlands? The [Declaratory Judgment] Act itself specifically contemplates declarations that are negative (non-liability) as well as affirmative (liability). And historically, declarations of non-liability have been among the most common suits filed under the Act, including ... suits by a party to declare non-liability for higher or additional payments. Extending the bar against declarations of non-liability from tort to contract cases would drastically handicap declaratory-judgment practice in Texas.
Id. at 668.
But this case is not like
MBM Financial.
Unlike the contract at issue in
MBM Financial,
the contract in this case was not terminated. BP is the only party seeking affirmative relief and, therefore, is the “real plaintiff’ in this case.
6
Cf BHP Petroleum Co.,
For the foregoing reasons, we conclude that the trial court abused its discretion by not extending comity to Delaware and staying the underlying action pending the resolution of the first-filed Delaware suit.
No Adequate Remedy by Appeal
Having determined that the trial court abused its discretion, we must inquire whether BP has an adequate remedy by appeal. By setting the case for trial on November 1, 2010, the trial court has made it likely that the Texas case will be tried before the Delaware case. If the Texas case proceeds to trial and BP prevails, it will not appeal, and its right to a stay is lost forever.
8
See In re State Farm Mut. Auto. Ins. Co.,
ConocoPhillips argues that BP has not shown that it does not have an adequate remedy by appeal. Were the roles reversed, ConocoPhillips complains, Delaware would not extend comity to Texas. *923 Therefore, the benefit of extending comity — reciprocity-—would not be achieved, and the disruption and delay caused by mandamus review would outweigh any benefit in granting BP’s petition. But it remains that ConocoPhillips has not shown that Delaware is an uncooperative jurisdiction, that the Delaware court hearing the breach-of-contract action under Texas law violates the public policy of this State, or why we should abandon Texas’ long-standing preference for first-filed cases. We conclude that BP does not have an adequate remedy by appeal.
* * *
We hold that the trial court abused its discretion by refusing to stay the underlying case pending the conclusion of the Delaware case, and that BP does not have an adequate remedy by appeal. Accordingly, we conditionally grant the petition for writ of mandamus and direct the trial court to (1) set aside its order of March 26, 2010, denying BP’s motion to dismiss, or in the alternative, to stay, and (2) enter an order that grants BP’s motion to stay and stays the proceedings until entry of final judgment in the Delaware case. The writ will issue only if the trial court fails to act in accordance with this opinion.
Notes
. By its express terms, the agreement is to be construed under Texas law.
.
See McWane Cast Iron Pipe Corp. v. McDowell-Wellman Eng’g Co.,
.To justify dismissal for forum non conve-niens under Delaware law, the movant must demonstrate that litigation in Delaware would cause "overwhelming hardship.”
BP Oil Supply Co.,
. ConocoPhillips conceded in the Delaware court that it could not meet the "overwhelming hardship” standard.
BP Oil Supply Co.,
. ConocoPhillips conceded at oral argument that it is not seeking damages.
. In
Space Master,
the court held that a party should not be allowed to use declaratory relief as a forum-shopping device where the same parties and issues, i.e., breach-of-contract actions for money damages, were pending in New Jersey state court and Massachusetts federal court, and where the declaratory-judgment action alleged contracts should not be enforced because of usurious interest rates.
.We recognize that BP would shed no tears at this result.
