Exhibit 21.1

List of Significant Subsidiaries of Copano Energy, L.L.C.

Name	Jurisdiction of Formation
Copano Energy Finance Corporation	Delaware
ScissorTail Energy, LLC	Delaware
Cimmarron Gathering, LP	Texas
Copano Field Services/Copano Bay, L.P.	Texas
Copano Field Services/South Texas, L.P.	Texas
Copano Field Services/Agua Dulce, L.P.	Texas
Copano Field Services/Central Gulf Coast, L.P.	Texas
Copano Field Services/Karnes, L.P.	Texas
Copano Field Services/Upper Gulf Coast, L.P.	Texas
Copano Field Services/Live Oak, L.P.	Texas
Copano Pipelines/South Texas, L.P.	Texas
Copano Pipelines/Upper Gulf Coast, L.P.	Texas
Copano Pipelines/Hebbronville, L.P.	Texas
Copano Pipelines/TGC, L.P.	Texas
Copano Energy Services/Upper Gulf Coast, L.P.	Texas
Copano Energy Services/Texas Gulf Coast, L.P.	Texas
Copano Field Services/North Texas, L.L.C.	Delaware
Alamo Creek Properties, L.L.C.	Delaware
River View Pipelines, L.L.C.	Delaware
CMW Energy Services, L.L.C.	Delaware
Greenwood Gathering, L.L.C.	Delaware
Copano Pipelines/North Texas, L.L.C.	Delaware
Copano Pipelines/Texas Gulf Coast, L.L.C.	Delaware
Copano Pipelines/Victoria, L.L.C.	Delaware
Copano Processing/Louisiana, LLC	Oklahoma

Name	Jurisdiction of Formation
Copano NGL Services, L.P.	Texas
Copano Processing, L.P.	Texas
Copano NGL Services (Markham), L.L.C.	Delaware
Copano/Webb-Duval Pipeline, L.P.	Delaware
Copano Field Services/Rocky Mountains, LLC	Delaware
Copano Field Facilities/Rocky Mountains, LLC	Delaware
Copano Pipelines/Rocky Mountains, LLC	Delaware
CPNO Services, L.P.	Texas
Copano Risk Management, L.P.	Texas