The Catalan Nationalist Party, Democratic Convergence of Catalonia (CDC), and the Catalan Republican Left (ERC) have formed a coalition on Tuesday to achieve their independence from Spain.
The new coalition will join its powers in the upcoming elections in September in order to breakaway from Madrid.
The parties also agreed to set up institutions that will be at the foundation of an independent Catalan state, while Catalan President Artur Mas stated in a document that the 18 months after the September polls will serve as a transition period towards independence.
The parties have expressed their hope that the elections will work as a referendum on the region’s future.
The demand came as a result of a non-official referendum held last November which Madrid considered as “unconstitutional.”
The catalonian government is trying to hold an independence referendum ever since.
"The parliament of Catalonia is empowered to initiate a process of constitutional reform. It is the only legal way to approach this process, and Mas knows this," Spanish Prime Minister Mariano Rajoy said at the time.
In the referendum, over 80 percent of Catalans voted in favour of independence, with a turnout of two million people out of an estimated 5.4 million eligible voters.
The parties state that a common government led by Artur Mas will be formed in case the elections bring a positive outcome.