Consolidated revenues for the three months ended October 31, 2023 were $163.8 million, which represented an increase of $45.9 million, or 38.9%, from consolidated revenues of $117.9 million reported for the three months ended October 31, 2022. The overall improvement in revenues was due to increases in revenues between quarters for both the power industry and industrial construction services reportable segments.
Consolidated gross profit for the three-month period ended October 31, 2023 was $19.2 million, or approximately 11.7% of the corresponding consolidated revenues, which reflected positive contributions from all three reportable business segments. However, the consolidated gross profit for the quarter was adversely impacted by the recorded loss of $10.7 million related to APC’s construction contract in Northern Ireland. For the three-month period ended October 31, 2022, the consolidated gross profit was $22.2 million, which represented approximately 18.8% of the corresponding amount of consolidated revenues.
Selling, general and administrative expenses for the three months ended October 31, 2023 and 2022 were $11.4 million, or 6.9% of corresponding consolidated revenues, and $12.7 million, or 10.7% of corresponding consolidated revenues, respectively.
Other income, net, for the three months ended October 31, 2023 was $3.7 million, which substantially related to income earned during the period on cash, cash equivalents and investments.
For the three months ended October 31, 2023, income tax expense was $6.1 million which represented an effective income tax rate of 52.9%. For the three months ended October 31, 2022, income tax expense was $2.6 million, which represented an effective income tax rate of 24.7% for the period.
Consolidated revenues for the nine months ended October 31, 2023 were $408.8 million, which represented an increase of $72.5 million, or 21.6%, from consolidated revenues of $336.3 million reported for the nine months ended October 31, 2022, with the power industry and industrial construction services reportable segments both contributing to the increase.
Consolidated gross profit for the nine-month period ended October 31, 2023 was $57.2 million, or approximately 14.0% of the corresponding consolidated revenues, which reflected positive contributions from all four of our operating companies, including APC. However, the $11.5 million of loss that was recorded during the nine-month period ended October 31, 2023, related to APC’s contract in Northern Ireland, adversely impacted the consolidated gross profit for the period. For the nine-month period ended October 31, 2022, the consolidated gross profit was $66.3 million, which represented approximately 19.7% of the corresponding amount of consolidated revenues.
Selling, general and administrative expenses for the nine months ended October 31, 2023 and 2022 were $32.5 million, or 7.9% of corresponding consolidated revenues, and $34.2 million, or 10.2% of corresponding consolidated revenues, respectively.
Other income, net, for the nine months ended October 31, 2023 was $7.2 million, which primarily reflected income earned during the period on invested funds, partially offset by the wire-transfer fraud loss that occurred in the first quarter of Fiscal 2024, its partial recovery, and related professional fees (see Note 15 to the accompanying condensed consolidated financial statements). Other income, net, for the nine months ended October 31, 2022 was $1.9 million, which included primarily our share of earnings associated with our solar fund investments and income earned on funds maintained in money market accounts and interest income earned on CDs.
For the nine months ended October 31, 2023, income tax expense was $11.6 million which represented an effective income tax rate of 36.3%. For the nine months ended October 31, 2022, income tax expense was $14.5 million.
For the three months ended October 31, 2023, our overall operating profit performance resulted in net income in the amount of $5.5 million, or $0.40 per diluted share. For the comparable period last year, we reported net income in the amount of $7.8 million, or $0.56 per dilutive share. For the nine months ended October 31, 2023, our net income increased to $20.3 million, or $1.50 per diluted share, from $19.5 million, or $1.36 per diluted share, for the nine months ended October 31, 2022.