Exhibit 99.1 Joint Filer Information Date of Event Requiring Statement: May 20, 2010 Issuer Name and Ticker or Trading Symbol: Crosstex Energy, L.P. [XTEX] Designated Filer: GSO Crosstex Holdings LLC Other Joint Filers: Blackstone / GSO Capital Solutions Fund LP Blackstone / GSO Capital Solutions Associates LLC GSO Special Situations Fund LP GSO Capital Partners LP GSO Advisor Holdings L.L.C. GSO Holdings I LLC Blackstone Holdings I L.P. Blackstone Holdings I/II GP Inc. The Blackstone Group L.P. Blackstone Group Management L.L.C. Mr. Stephen A. Schwarzman, Bennett J. Goodman, J. Albert Smith III, Douglas I. Ostrover Addresses: The address of the principal business and principal office of each of GSO Crosstex Holdings LLC, Blackstone/GSO Capital Solutions Fund LP, Blackstone/GSO Capital Solutions Associates LLC, GSO Special Situations Fund LP, GSO Capital Partners LP, GSO Advisor Holdings L.L.C., GSO Holdings I LLC, Bennett J. Goodman, J. Albert Smith III and Douglas I. Ostrover is 280 Park Avenue, New York, NY 10017. The address of the principal business and principal office of each of Blackstone Holdings I L.P., Blackstone Holdings I/II GP Inc., The Blackstone Group L.P., Blackstone Group Management L.L.C. and Mr. Stephen A. Schwarzman is c/o The Blackstone Group, 345 Park Avenue, New York, NY 10154. Signatures: Dated: May 24, 2010 GSO Crosstex Holdings LLC By: /s/ Marisa Beeney ----------------------------- Name: Marisa Beeney Title: Authorized Person Blackstone / GSO Capital Solutions Fund LP By: /s/ Marisa Beeney ----------------------------- Name: Marisa Beeney Title: Authorized Person Blackstone / GSO Capital Solutions Associates LLC By: /s/ Marisa Beeney ----------------------------- Name: Marisa Beeney Title: Authorized Person GSO Special Situations Fund LP By: /s/ Marisa Beeney ----------------------------- Name: Marisa Beeney Title: Authorized Person GSO Capital Partners LP By: /s/ Marisa Beeney ----------------------------- Name: Marisa Beeney Title: Authorized Person GSO Advisor Holdings L.L.C. By: /s/ Robert L. Friedman ----------------------------- Name: Robert L. Friedman Title: Authorized Person GSO Holdings I LLC By: /s/ Robert L. Friedman ----------------------------- Name: Robert L. Friedman Title: Authorized Person Blackstone Holdings I L.P. By: /s/ Robert L. Friedman ----------------------------- Name: Robert L. Friedman Title: Authorized Person Blackstone Holdings I/II GP Inc. By: /s/ Robert L. Friedman ----------------------------- Name: Robert L. Friedman Title: Authorized Person The Blackstone Group L.P. By: /s/ Robert L. Friedman ----------------------------- Name: Robert L. Friedman Title: Authorized Person Blackstone Group Management L.L.C. By: /s/ Robert L. Friedman ----------------------------- Name: Robert L. Friedman Title: Authorized Person Mr. Stephen A. Schwarzman By: /s/ Stephen A. Schwarzman ----------------------------- Name: Stephen A. Schwarzman Bennett J. Goodman By: /s/ George Fan ----------------------------- Name: George Fan Title: Attorney-in-Fact J. Albert Smith III By: /s/ George Fan ---------------------------------- Name: George Fan Title: Attorney-in-Fact Douglas I. Ostrover By: /s/ George Fan ----------------------------- Name: George Fan Title: Attorney-in-Fact