Voyage Expenses. Voyage expenses were $34.6 million for the three months ended September 30, 2024, an increase of $4.0 million from $30.6 million for the three months ended September 30, 2023. The net increase is primarily due to a $2.3 million increase in port, agency and broker commission costs, and a $1.7 million increase from higher bunker consumption.
TCE Rate. The average TCE rate for the Company’s fleet was $26,628 per day for the three months ended September 30, 2024, an increase of $281 per day from $26,347 per day for the three months ended September 30, 2023. TCE rates represent net revenues (a non-GAAP measure representing revenue less voyage expenses) divided by revenue days. Net revenue utilized to calculate TCE is determined on a discharge-to-discharge basis, which is different from how the Company records revenue under U.S. GAAP.
Vessel Operating Expenses. Vessel operating expenses were $14.0 million for the three months ended September 30, 2024, a decrease of $0.4 million from $14.4 million for the three months ended September 30, 2023. The decrease reflects the timing of vessel operating expenses between quarters. Vessel operating expenses, by their nature, are prone to fluctuations between periods.
Charter Hire Costs. Total charter hire expense was $5.9 million for the three months ended September 30, 2024, an increase of $1.8 million from $4.1 million for the three months ended September 30, 2023. This increase is as a result of higher charter hire rates during the three months ended September 30, 2024 compared to the three months ended September 30, 2023. Total charter hire expense for the three months ended September 30, 2024 was comprised of an operating expense component of $3.1 million and a vessel lease expense component of $2.8 million.
Depreciation. Depreciation expense for the three months ended September 30, 2024 was $7.8 million, an increase of $0.9 million from $6.9 million for the three months ended September 30, 2023. This increase is primarily attributable to the purchase of the Ardmore Gibraltar in April 2024 and the installation of ballast water treatment systems and scrubber systems on several vessels during their most recent drydock cycle.
Amortization of Deferred Drydock Expenditures. Amortization of deferred drydock expenditures for the three months ended September 30, 2024 was $1.0 million, an increase of $0.3 million from $0.7 million for the three months ended September 30, 2023. Deferred drydocking costs for a given vessel are amortized on a straight-line basis to the next scheduled drydocking of the vessel.
General and Administrative Expenses: Corporate. Corporate-related general and administrative expenses for the three months ended September 30, 2024 were $6.3 million, an increase of $1.2 million from $5.1 million for the three months ended September 30, 2023. This increase is primarily due to one-time expenses associated with the leadership transition during the three months ended September 30, 2024 compared to the three months ended September 30, 2023.
General and Administrative Expenses: Commercial and Chartering. Commercial and chartering expenses are the expenses attributable to Ardmore’s chartering and commercial operations departments in connection with its spot trading activities. Commercial and chartering expenses for the three months ended September 30, 2024 were $1.2 million, generally consistent with $1.1 million for the three months ended September 30, 2023.
Unrealized losses on Derivatives. The Company had an insignificant amount of unrealized losses on derivatives for the three months ended September 30, 2024, as compared to no unrealized gains or losses for the three months ended September 30, 2023.
Interest Expense and Finance Costs. Interest expense and finance costs for the three months ended September 30, 2024 were $1.1 million, a decrease of $1.9 million from $3.0 million for the three months ended September 30, 2023. The decrease in costs was due to the reduction of the average outstanding balance due to the conversion of the Company’s term loan into a fully revolving facility with 50% of the term loan being converted to a revolving facility during the three months ended June 30, 2023 and the remaining 50% being converted during the three months ended March 31, 2024. The current flexibility of the Company’s revolving facilities, with only $22.5 million drawn down as of September 30, 2024, has minimized the impact on the Company of the elevated interest rate environment. Amortization of deferred finance fees for the three months ended September 30, 2024 was $0.3 million, consistent with $0.3 million for the three months ended September 30, 2023.