And we are excited about the subsequent round. To update on this, in August, in August the next installment of $400 million competitive grant funding round closed its application process, that is have already expected to start trickling out later this month and run into January, with the words to be issued later in Q1 2024. Since our last call, EPA has also opened up a subsequent $500 million funding round. This installment will look more similar to around one in 2022 as it will be a rebate process. The application window for this round is expected to be open until the end of January. Rebate recipients are expected to be notified in April 2024, after which winners can place purchase orders in relatively short order and submit for reimbursement.
We look forward to hopefully adding even more success in these rounds as we did in 2022. With our Nuvve K-12 unit, we are confident we are even better positioned. Before passing it over to David to discuss our financial results, we spoke a lot earlier in the year about our Circle K partnership in the Nordics. And it forms part of our strategic initiative to accelerate growth in megawatts under management to deployment of our GIVe platform on third party ChargePoint operator hardware. As of today, we are actually completely integrated our software with the hardware, we expect to begin participating in the market and generating revenue prior to the end of the year. More importantly, we are paving the way for more material revenue generation starting in 2024 and for exponential growth in megawatts under management in the region and beyond of the long-term.
David, over to you.
David Robson: Thanks, Gregory. I will start with a recap of third quarter 2023 results. In the third quarter we generated total revenues of $2.7 million compared $0.6 million in the third quarter of 2022. The increase was primarily driven by a large increase in charger hardware sales, higher grid service revenues and the sale of five buses. Grid service revenues of $0.6 million represented 21% of total revenues this quarter and 3.4x increase from the prior year quarter. Year-to-date through September 30, 2023 grid service revenues were $0.8 million, which compares with $0.3 million for the prior year period, representing approximately a three fold increase. Margins on products and service revenues were 9% for the third quarter 2023 compared to 43.3% in the year ago period, margins were heavily impacted by the affirmation sale of five busses.
As a reminder, margins can be lumpy from quarter to quarter depending on the mix. DC charger gross margins at standard pricing generally range from 15% to 25%. While AC charger gross margins are approximately 50%, but in dollar terms are a small fraction of the revenue of a DC charger. Grid service revenue margins are generally 30%. Operating costs, excluding cost of sales was $8.8 million for the third quarter of 2023, compared to $8.9 million in the third quarter of 2022 declining mainly due to lower payroll and public company fees offset by higher consulting and legal expenses. Cash operating expenses excluding cost of sales, stock compensation, and depreciation and amortization was $7.6 million in the third quarter of 2023 versus $7.7 million in the third quarter of 2022 and $7.3 million in the second quarter of 2023.
Other income was $0.3 million in the third quarter of 2023, down from $1.94 million in the year ago quarter. The year ago period benefited from $1.85 million non-cash gain from the change in the value of warrants. Net loss attributable to Nuvve common stockholders increase in the third quarter of 2023 to $8.3 million from a net loss of $6.7 million in Q3 of 2022. The increase was also primarily a result of the just mentioned non-cash gain in the year ago quarter. Now turning to our balance sheet, we had approximately $13.9 million in cash as of September 30, 2023, excluding $0.5 million in restricted cash. Included in our cash balance was approximately $9.8 million of EPA funds received. We expect to remit these funds to customers during the fourth quarter.
