Xia Liu
Executive Vice President and Chief Financial Officer at WEC Energy Group
Thank you, Gale. Our 2023 first quarter earnings of $1.61 per share decreased $0.18 per share compared to the first quarter of 2022. Our earnings package includes a comparison of first quarter results on Page 12. I'll walk-through the significant drivers. Starting with our utility operations, our earnings were $0.09 lower compared to the first quarter of '22. Rate base growth contributed $0.22 to earnings, driven by continued investment in our ESG progress plan. This includes the base rate increase for our Wisconsin utilities as well as the interim rate increase for Minnesota Energy Resources, both of which were effective January 1, 2023. This favorable margin impact from rate base growth was more than offset by a number of factors.
First, as Gale noted, we experienced one of the mildest winters in history, which drove a $0.12 decrease in earnings compared to the first quarter of last year. Additionally, timing of fuel expense, depreciation and amortization interest, day-to-day O&M, taxes and other, drove a combined $0.19 negative variance.
Before I turn to earnings at the other segments, let me briefly discuss our weather-normalized sales. You can find our sales information on Page 9 of the earnings package. I'd like to remind you that weather normalization is not a perfect sign. Extreme warm weather in the first quarter may not be fully reflected in our weather-normalized data. Having said that, weather normal retail natural gas deliveries in Wisconsin, excluding natural gas used for power generation, were down 1%. However, residential usage, again, on a weather normal basis, grew 0.9%. That was ahead of our forecast. Weather normal retail electric deliveries, excluding the iron ore mine, were 1.9% lower. Residential usage was relatively flat compared to last year.
Now at our energy Infrastructure segment, earnings were $0.01 lower in the first quarter of '23 compared to the first quarter of '22. Production tax credits were higher by $0.03 quarter-over-quarter, resulting from acquisitions of renewable generation projects. This increase was largely offset by a pickup that we recorded in the first quarter last year from the resolution of market settlements in the Southwest Power Pool.
Finally, you'll see that earnings at our corporate and other segment decreased $0.08, primarily driven by an increase in interest expense and a pickup recorded in the first quarter '22 from our investment in the clean energy fund. These items were partially offset by favorable rabbi trust performance and some tax and other items. Remember, rabbi trust performance is largely offset in O&M.
Looking now at the cash flow statement on Page 6 of the earnings package, net cash provided by operating activities decreased $281 million. The mild winter and timing of recovery of commodity costs contributed to this decrease. Total capital expenditures and asset acquisitions were $1.3 billion in the first quarter of '23, an $884 million increase from the first quarter of '22. This was primarily driven by the acquisition of the Whitewater natural gas power generation facility in our Wisconsin segment, as well as the Sapphire Sky Wind farm and Samson 1 solar facility in our infrastructure segment.
In closing, as Gale mentioned earlier, we're reaffirming our 2023 earnings guidance of $4.58 to $4.62 per share assuming normal weather for the rest of the year. To offset the mild first quarter weather impact, we're implementing a variety of initiatives. As a result, we now expect our day-to-day O&M to be 2% to 3% higher than 2022 versus our previous expectation of 3% to 5% higher. I will also add that largely due to timing of O&M and fuel expense, we expect earnings in the second half of this year to be materially better than the second half of 2022. For the second quarter, we're expecting a range of $0.83 to $0.85 per share. This accounts for April weather and assumes normal weather for the rest of the quarter. As a reminder, we earned $0.91 per share in the second quarter last year.
With that, I'll turn it back to Gale.