Time charter and bareboat revenues: Time charter and bareboat revenues increased by $3.9 million to $132.9 million for the six months ended June 30, 2023, compared to $129.0 million for the six months ended June 30, 2022. The increase was mainly due to the inclusion of the Synnøve Knutsen in the fleet from July 1, 2022 and higher utilization in the fleet in the first half of 2023 compared to the first half of 2022 which was affected by the scheduled drydockings of the Tordis Knutsen, the Lena Knutsen, the Anna Knutsen, the Vigdis Knutsen and the Windsor Knutsen.
Voyage revenues: Voyage revenues for the six months ended June 30, 2023, were $8.8 million. Voyage revenues relate to spot voyages performed by the Ingrid Knutsen and the Torill Knutsen.
Loss of hire insurance recoveries: Loss of hire insurance recoveries for the six months ended June 30, 2023, were $2.3 million compared to $ nil for the six months ended June 30, 2022. The loss of hire insurance recoveries in the six months ended June 30, 2023, were related to the Windsor Knutsen in connection with repairs of a leakage from a tunnel thruster reported in the third quarter of 2022. The Windsor Knutsen was off hire from September 29, 2022, to October 31, 2022 for repairs. For the six months ended June 30, 2023, the Partnership recorded $0.8 million in loss of hire recoveries with respect to the Windsor Knutsen. The Lena Knutsen reported excessive and abnormal wear found on the steering gear rotor in relation with her scheduled drydocking in the second quarter of 2022. For the six months ended June 30, 2023, the Partnership recorded $0.6 million in loss of hire recoveries with respect to the Lena Knutsen. The Synnøve Knutsen reported an oil leakage from the controllable pitch propellers system in the third quarter of 2022. As a result, the vessel was placed off hire from October 14, 2022, to November 1, 2022, for repairs. For the six months ended June 30, 2023, the Partnership recorded $0.9 million in loss of hire recoveries with respect to the Synnøve Knutsen.
Other income: Other income for the six months ended June 30, 2023 was $973,000 compared to $180,000 for the six months ended June 30, 2022. The increase is mainly due to income related to the VOC plant installed on the Bodil Knutsen.
Vessel operating expenses: Vessel operating expenses for the six months ended June 30, 2023 were $44.7 million, an increase of $1.6 million from $43.1 million in the six months ended June 30, 2022. The increase is mainly related to bunker costs for the Windsor Knutsen, the Lena Knutsen, the Anna Knutsen and the Vigdis Knutsen in connection with their voyages to drydock.
Voyage expenses and commission: Voyage expenses and commission for the six months ended June 30, 2023, were $4.9 million and relate to bunker cost, commission and port costs for spot voyages performed by the Ingrid Knutsen and the Torill Knutsen.
Depreciation: Depreciation expense for the six months ended June 30, 2023 was $55.8 million, an increase of $3.8 million from $52.0 million in the six months ended June 30, 2022. The increase is mainly related to the inclusion of the Synnøve Knutsen from July 1, 2022.
Impairment: Impairment charge for the six months ended June 30, 2023 was $49.6 compared to $ nil for the six months ended June 30, 2022. The impairment charge for the six months ended June 30, 2023, related to the Dan Cisne and the Dan Sabia. The carrying values of the Dan Cisne and the Dan Sabia were written down to their estimated fair values, using a discounted cash flow valuation.
General and administrative expenses: General and administrative expenses for the six months ended June 30, 2023 were $3.5 million, compared to $3.1 million for the six months ended June 30, 2022.
Interest income: Interest income for the six months ended June 30, 2023 was $1.5 million compared to $61,000 for the six months ended June 30, 2022. The increase is mainly due to increased interest rates on our bank deposits.
Interest expense: Interest expense for the six months ended June 30, 2023 was $35.5 million, an increase of $20.5 million from $15.0 million in the six months ended June 30, 2022. The increase was mainly due to an increase in the US dollar LIBOR rate, increased interest expense for the credit facility related to the acquisition of the Synnøve Knutsen on July 1, 2022, increased interest expense on the revolving credit facilities and increased interest expense for the Torill Knutsen in connection with the sale and leaseback transaction in which both the financial obligation and interest rate increased.
Other finance expense: Other finance expense was $0.2 million for the six months ended June 30, 2023, compared to $0.3 million for the six months ended June 30, 2022. Other finance expense is primarily related to bank fees and guarantee commissions.