[8][9] An agreement was reached on 28 October 2015 to constitute an alliance under the "En Comú Podem" label, aiming at mirroring Colau's success in the 2015 Barcelona local election.

[13] Under the promise of holding a legal and binding referendum on independence if accessing the national government,[14][15] En Comú Podem emerged as the largest force in Catalonia in the 20 December general election, securing 24.7% of the share and 12 seats in the Congress of Deputies.

[16][17] The alliance was renewed for the 2016 general election, with an unsuccessful attempt to incorporate Pirates of Catalonia into the lists despite the party having initially expressed interest in doing so.

[18][19][20] ECP maintained its status as the largest political list in Catalonia on 26 June, but fell short of achieving a landslide victory at the scale predicted by opinion polls.

[30] After the launching of Más País by former Podemos founder Íñigo Errejón ahead of the November 2019 Spanish general election and his announcement of a general agreement with Equo to run in alliance in a number of constituencies, including Barcelona,[31] Equo's branch in Catalonia refused to join Errejón's lists and pledged its support to the En Comú Podem alliance.