Alberta wants to have its say when British Columbia goes to the Supreme Court for a ruling on who is in charge of interprovincial projects like pipelines.

The B.C. government has filed to have intervener status as regulators prepare for a second review of the Trans Mountain Pipeline expansion.

An advocacy group that argues for the interests of taxpayers will be asking the courts to allow it take part in separate legal cases in British Columbia and Saskatchewan in a dispute over federal and provincial jurisdiction.