Near the beginning 2001, subsequent to making accusations against the BJP, she walked farther from the NDA cabinet and linked with the Congress Party for West Bengal Assembly Elections 2001, in the midst of gossip that the move could dethrone the Communist Government. She came back to the cabinet in January 2004, and held the Ministry of Coal and Mines portfolios till the Elections in 2004, in which she won as the solitary Trinamool Congress member to be triumphant of the Parliament seat from West Bengal.
On October 20, 2005, she raised complaint against the policy of industrialization of the West Bengal Government, particularly Buddhadev Bhattacharya. Benny Santoso, CEO of the based Salim Group of Indonesia had taken oath for a huge investment in West Bengal, and the Government had prearranged farmland for the purpose in Howrah, which ignited remonstration. Regardless of soaking wet rain, Mamata accompanied by further Trinamool Congress members plunked in the frontage of the Taj Hotel where Santoso had stayed, shut out by the security and police cordon. Soon after, she along with supporters pursued convoy of Santoso. A premeditated black flag dissent was restrained from, whilst the government had Santoso turn up three hours in advance of schedule.
Mamata Banerjee experienced additional impede during 2005, when her party mislaid command of the Kolkata Municipal Corporation and the then Mayor blemished from her party. In 2006, the Trinamool Congress was overpowered in West Bengal Assembly Elections, trailing more than half of the members.
A drama was witnessed on 4th August, 2006 when Mamata Banerjee pitched her letter of resignation towards the Deputy Speaker, Charanjit Singh Atwal. The aggravation was the denunciation of the Lok Sabha Speaker, Somnath Chatterjee of her motion to adjourn regarding illicit access by people of Bangladesh in West Bengal. The proposition was rejected by the speaker for the reason that it was not in suitably formatted.
During November 2006, Mamata Banerjee was by force blocked on her approach to Singur for a rally in opposition to a proposed car project of the Tata Motors. Mamata in turn arrived at the West Bengal Assembly to exhibit her protest at the venue. She spoke to a press conference at the assembly and made an announcement for a 12 hour shut down by her party. The M.L.A.s of Trinamul Congress as a mark of protest damaged furniture along with microphones in the West Bengal Assembly House. The spoil was likely to be worth Rs 15 lak. They furthermore assembled in the streets and blocked roads and burnt down vehicles in several places. A most important strike was called on December 14, 2006 that resulted life out of gear in West Bengal, Kerala and Tripura.
At this instant in Parliamentary Election 2009 where TMC had a coalition with UPA and populace of West Bengal acted chiefly in opposition to the Left front and elected Congress TMC association in 26 Parliamentary seats, which ended with Mamata Banerjee once more becoming the Honorable Minister for the Indian Railway for next five years.
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