ERC and EH Bildu will repeat their 2023 Senate alliance on 29 November. Both parties still need to ratify the pact, which puts housing at the centre of their parliamentary agenda.
The agreement still needs approval from both parties before it can move into the electoral process.
ERC and EH Bildu will return to the same Senate electoral platform on 29 November, reviving the coalition used in the 2023 general election. They say the arrangement will preserve a joint parliamentary force for Catalan and Basque priorities while confronting what both formations call the "bloque reaccionario". This is a separate pact between the two sovereignist parties. It does not amount to a coalition with PSOE.
For the separatist parties, the Senate alliance has a practical purpose. They present it as a tested way to coordinate pressure in the Cortes Generales and advance their political objectives from a shared position. According to La Vanguardia and Diario Vasco, ERC and EH Bildu intend to keep working together in the upper chamber and maintain their own parliamentary group after the election.
In the 23 July 2023 general election, ERC and EH Bildu stood for the Senate under the name ‘Izquierdas por la Independencia’. After the vote, the formula also served to coordinate their work in the upper chamber.
Housing now gives the pact its clearest social focus. The parties place the so-called "emergencia habitacional" among their main priorities and link it to intervention in the rental market, restrictions on property owners and a continued expansion of social protection managed by regional administrations. The source material presents these measures as demands associated with the radical left, not as policies already adopted. Their joint agenda also calls for defending the right to housing and supporting people affected by the housing crisis.
Their joint statement frames the coming vote as a contest with constitutionalist forces. ERC and EH Bildu say the campaign should defend the rights of Basques and Catalans, along with their ability to "decidir su futuro" outside the framework of Spanish national sovereignty. That language keeps the separatist objective at the centre of an alliance that also addresses housing. The parties tie the pact to expanding social guarantees and resisting what they describe as a reactionary bloc.
The agreement was announced subject to approval by the members of both parties. La Ciutat reported that the coalition registration was expected to be completed by 16 October, making ratification a formal step before the electoral process was finalised.
The wider campaign is already turning toward debates and political positioning ahead of the same 29 November vote.
ERC and EH Bildu have worked as preferred parliamentary partners of Pedro Sánchez's Government during the latest legislatures. Renewed coordination in the upper chamber is meant to preserve that influence over national governability while giving their separate territorial agendas a common electoral vehicle. The parties say their cooperation has helped defend the interests of Catalonia. They make the same claim for the Basque Country and their respective social groups.
The pact rests on two calculations: concentrate parliamentary pressure and keep the separatist programme visible inside Spain's common institutions. Housing supplies the immediate social issue. The deeper political purpose is continued coordination of Catalan and Basque independence demands.
Its electoral logic differs from a joint Congress list. ERC competes in Catalonia, while EH Bildu runs in the Basque Country and Navarre. The parties therefore do not normally compete for the same votes in the same territories. A Senate formula offers no obvious advantage through the redistribution of votes between their regions. Its practical value lies in preserving coordination and influence after the election.
The pact remains focused on the Senate, with housing added to the long-running territorial dispute as a central campaign demand.
