Total other expense, net, decreased $0.3 million, or 53.4%, for the three months ended October 1, 2021 compared to the three months ended October 2, 2020 as a result of lower interest income and lower interest expense related to principal reductions in term loans.
We recorded an income tax benefit of $0.2 million for the three months ended October 1, 2021 compared to a tax benefit of $1.6 million for the three months ended October 2, 2020. The decrease in the income tax benefit is primarily attributable to higher pre-tax income combined with decreases related to energy efficiency building deductions.
Net income was $0.8 million, or $0.06 per diluted share, for the three months ended October 1, 2021, as compared to net income of $2.6 million, or $0.21 per diluted share, for the three months ended October 2, 2020. Adjusted Net Income (see “Use of Non-GAAP Financial Measures” below) for the third quarter of 2021 was $6.9 million, or $0.53 per diluted share, as compared to Adjusted Net Income of $8.5 million, or $0.68 per diluted share, for the third quarter of 2020.
Adjusted EBITDA (see “Use of Non-GAAP Financial Measures” below) was $10.1 million for the third quarter of 2021 compared to $11.0 million in 2020.
Nine Months 2021 Financial Results
Consolidated contract revenue decreased 11.1%, in the nine months ended October 1, 2021 to $261.5 million primarily due to decreased contract revenues from our construction management activities in our Energy segment and the impact of having one fewer week in our first fiscal quarter of fiscal year 2021 as compared to our first fiscal quarter of fiscal year 2020.
Net Revenue for the nine months ended October 1, 2021 was $149.7 million, an increase of 4.1%, from $143.8 million for the nine months ended October 2, 2020 as increasing utility program revenue offset the reductions in construction management activities.
Direct costs of consolidated contract revenue decreased $38.8 million, or 19.5%, in the nine months ended October 1, 2021 compared to the nine months ended October 2, 2020, primarily as a result of decreased contract revenues from construction management activities in our Energy segment and the impact of having one fewer week in our first fiscal quarter of fiscal year 2021 as compared to our first fiscal quarter of fiscal year 2020. The change in the mix of revenues resulted in a gross profit margin of 38.7% in 2021 compared to 32.3% in 2020.
G&A expenses increased by $5.6 million, or 5.3%, in the nine months ended October 1, 2021 compared to the nine months ended October 2, 2020. The increase in G&A expenses in the Energy segment and Engineering and Consulting segment was primarily attributed to higher wage and related benefit costs and an increase in professional service fees and travel.
Operating loss was $9.8 million for the nine months ended October 1, 2021 compared to a loss of $10.5 million in 2020 as a result of the factors noted above.
Total other expense, net, was $3.1 million for the nine months ended October 1, 2021 compared to $3.3 million for the nine months ended October 2, 2020.
Income tax benefit was $5.4 million for the nine months ended October 1, 2021 compared to a tax benefit of $3.3 million for the nine months ended October 2, 2020. The increase in the income tax benefit is primarily attributable to an increase in various tax deductions and tax credits related to stock compensation and project-related incentives, and an additional tax benefit related to the net operating loss carryback provision of the CARES Act.
Our net loss was $7.5 million, or ($0.61) per diluted share, for the nine months ended October 1, 2021, as compared to a net loss of $10.5 million, or ($0.90) for the nine months ended October 2, 2020. Adjusted Net Income (see “Use of Non-GAAP Financial Measures” below) for the nine months ended October 1, 2021 was $12.2 million, or $0.99 per diluted share, as compared to Adjusted Net Income of $9.0 million, or $0.77 per diluted share, for the nine months ended October 2, 2020.