The oath-taking ceremony, which was held in the Speaker's chamber, was attended by Bahuguna's family members, union minister Harish Rawat, Lok Sabha MP Satpal Maharaj and Uttarakhand PCC Chief Yashpal Arya among others.
Bahuguna was elected as MLA from Sitarganj last month when he defeated his nearest rival of BJP, Prakash Pant, with a record margin of nearly 40,000 votes in the by-election which was necessitated after former BJP MLA Kiran Mandal quit his membership in his favour.
Bahuguna's huge win also increased the tally of Congress to 33 in a house of 70 while the strength of the BJP was reduced to 30. All the 7 non-Congress and non-BJP MLAs including 3 independents are supporting the Bahuguna government.