Homer Bhullar
Vice President of Investor Relations & Finance at Valero Energy
Thanks, Joe. For the first quarter of 2023, net income attributable to Valero stockholders was $3.1 billion or $8.29 per share compared to $905 million or $2.21 per share for the first quarter of 2022. First quarter 2023 adjusted net income attributable to Valero stockholders was $3.1 billion or $8.27 per share compared to $944 million or $2.31 per share for first quarter of 2022. For reconciliations to adjusted amounts please refer to our earnings release and accompanying earnings release tables.
The Refining segment reported $4.1 billion of operating income for first quarter of 2023 compares to $1.5 billion for the first quarter of 2022. Refining throughput volumes for first quarter of 2023 averaged 2.9 million barrels per day which was 130,000 barrels per day higher than first quarter of 2022. Throughput capacity utilization was 93% in the first quarter of 2023 compared to 89% in first quarter of 2022. Refining cash operating expenses were $4.78 per barrel in first quarter of 2023 lower than guidance of $4.95, primarily attributed to higher throughput and lower natural gas prices.
Renewable Diesel segment operating income was $205 million for the first quarter of 2023 compared to $149 million for first quarter of 2022. Renewable diesel sales volumes averaged 3 million gallons per day in the first quarter of 2023 which was 1.3 million gallons per day higher than the first quarter of 2022. The higher sales volumes in the first quarter of 2023 was due to the impact of additional volume from start-up of the DGD Port Arthur plant in the fourth quarter of 2022. The Ethanol segment reported $39 million of operating income for the first quarter of 2023 compared to $1 million for first quarter 2022. Ethanol production volumes averaged 4.2 million gallons per day in the first quarter of 2023 which was 138,000 gallons per day higher than the first quarter of 2022.
For the first quarter of 2023, G&A expenses were $244 million and net interest expense was $146 million. Depreciation and amortization expense was $660 million and income tax expense was $880 million for the first quarter of 2023. The effective tax rate was 22%. Net cash provided by operating activities was $3.2 billion in the first quarter of 2023. Excluding the unfavorable change in working capital of $534 million in first quarter and the other joint ventures member share of DGD's net cash provided by operating activity excluding changes in DGD's working capital, adjusted net cash provided by operating activities was $3.6 billion.
Regarding investing activities, we made $524 million of capital investments in the first quarter of 2023, of which $341 million was for sustaining the business, including costs for turnarounds, catalysts and regulatory compliance and $183 million was for growing the business. Excluding capital investments attributable to the other joint venture member's share of DGD, capital investments attributable to Valero were $467 million in the first quarter of 2023.
Moving to financing activities; we returned over $1.8 billion to our stockholders in the first quarter of 2023 of which $379 million was paid as dividend and $1.5 billion was for purchase of approximately 11 million shares of common stock, resulting in a payout ratio of 52% of [indecipherable] net cash provided by operating activities. With respect to our balance sheet, as Joe mentioned, we completed additional debt reduction transaction in the first quarter that reduced Valero's debt by $199 million through opportunistic open market repurchases. We ended the quarter with $9 billion of total debt, $2.4 billion of finance lease obligations and $5.5 billion of cash and cash equivalents. The debt-to-capitalization ratio -- net of cash and cash equivalents was 18% as of March 31, 2023. And we ended the quarter capitalized with $5.4 billion of available liquidity excluding cash.
Turning to guidance. We expect capital investments attributable to Valero for 2023 to be approximately $2 billion which includes expenditures for turnarounds, catalysts and joint venture investments. About $1.5 billion of that is allocated to sustaining business and the balance to growth. For modeling our second quarter operations, we expect Refining throughput volumes to fall with the following ranges; Gulf Coast at 1.73 million to 1.78 million barrels per day; Mid-Continent at 405,000 to 425,000 barrels per day; West Coast at 250,000 to 270,000 barrels per day and North Atlantic at 450,000 to 470,000 barrels per day. We expect Refining cash operating expenses in the second quarter to be approximately $4.60 per barrel.
With respect to the Renewable Diesel segment, we expect sales volumes to be approximately 1.2 billion gallons in 2023. Operating expenses in 2023 should be $0.10 [Phonetic] per gallon which includes $0.19 per gallon for noncash costs such as depreciation and amortization. Our Ethanol segment is expected to produce 4.2 million gallons per day in second quarter. Operating expenses should average $0.40 per gallon which includes $0.05 per gallon for non-cash costs such as depreciation and amortization.
For the second quarter, net interest expense should be about $145 million, and total depreciation and amortization expense should be approximately $670 million. For 2023 we expect G&A expenses, excluding corporate depreciation, to be approximately $925 million.
That concludes our opening remarks. [Operator Instructions]