The primary drivers for this segment’s revenues for the three months ended October 31, 2023, were the construction of the Shannonbridge Power Project, the Trumbull Energy Center and the ESB FlexGen Peaker Plants.
Industrial Construction Services
The revenues of our industrial construction services segment, representing the business of TRC, increased by $2.9 million, or 7.6%, to $41.3 million for the three months ended October 31, 2024 compared to revenues of $38.4 million for the three months ended October 31, 2023. For the three months ended October 31, 2024 and 2023, the revenues of this segment represented 16.1% and 23.5% of consolidated revenues for the corresponding periods.
Telecommunications Infrastructure Services
The revenue results of this business segment, which represent the business of SMC, were $3.6 million for the three-month period ended October 31, 2024, a decrease of $0.4 million, or 11.1%, from the amount of revenues earned during the three months ended October 31, 2023.
Cost of Revenues
With the increase in consolidated revenues for the three months ended October 31, 2024 compared with last year’s third quarter ended October 31, 2023, the consolidated cost of revenues also increased between the quarters. These costs were $212.7 million and $144.5 million for the three-month periods ended October 31, 2024 and 2023, respectively, representing an increase of approximately 47.2%.
For the three-month period ended October 31, 2024, we reported a consolidated gross profit of approximately $44.3 million, which represented an increase from the gross profit reported for the three-month period ended October 31, 2023 in the amount of $19.2 million.
The gross profit percentage of corresponding consolidated revenues increased to 17.2% for the three-month ended October 31, 2024, from 11.7% of corresponding consolidated revenues in the comparable prior year period. The increase in the gross profit percentage during the current period was primarily due to the changing mix of projects, strong execution and certain positive project closeouts. Additionally, during the three-month period ended October 31, 2023, gross profit was negatively impacted by losses recorded on the Kilroot Project, which reduced margins by approximately $10.7 million. The gross profit percentages of corresponding revenues for the power industry services, industrial construction services and the telecommunications infrastructure services segments were 18.3%, 11.1% and 26.1%, respectively, for the quarter ended October 31, 2024.
The gross profit percentages of corresponding revenues for the power industry services, industrial construction services and the telecommunications infrastructure services segments were 11.1%, 11.8% and 29.4%, respectively, for the quarter ended October 31, 2023.
Selling, General and Administrative Expenses
These costs were $14.0 million and $11.4 million for the three months ended October 31, 2024 and 2023, respectively, and represented 5.4% and 6.9% of corresponding consolidated revenues, respectively.
Other Income, Net
Other income, net, for the three months ended October 31, 2024 was $6.6 million, which reflected income earned during the period on investments in the total amount of approximately $4.8 million, as the weighted average balances of investments are meaningfully higher this year, and earnings related to cash and cash equivalent balances.
Other income, net, for the three months ended October 31, 2023 was $3.7 million, which reflected primarily income earned during the period on investments in the total amount of approximately $4.0 million.
Income Taxes
We incurred income tax expense for the three months ended October 31, 2024 in the amount of approximately $9.0 million, which represents an effective income tax rate of 24.3%. This effective tax rate differs from the statutory federal tax rate of 21% due primarily to the typically unfavorable estimated effects of state income taxes and permanent differences. For the