Dan Cregg
Executive Vice President and Chief Financial Officer at Public Service Enterprise Group
Thank you, Ralph. Good morning, everyone. As Ralph mentioned earlier, PSEG reported net income of $1.06 per share for the first quarter of 2024 compared to $2.58 per share in 2023. Non-GAAP operating earnings were $1.31 per share in the first quarter of 2024 compared to $1.39 per share in 2023. We provided you with information on Slide 7 regarding the contribution to non-GAAP operating earnings per share by business for the first quarter.
And Slide 8 contains a waterfall chart that takes you through the net changes quarter-over-quarter in non-GAAP operating earnings per share by a major business. Starting with PSE&G, which reported first quarter net income of $0.98 per share for both 2024 and 2023. PSE&G had non-GAAP operating earnings of $0.98 per share for the first quarter of '24 compared to $0.99 per share in 2023. The main drivers for both net income and non-GAAP results for the quarter or growth in rate base from continued investments in infrastructure replacement, offset by higher distribution investment related depreciation and interest expense, not yet reflected in rates as well as higher O&M costs.
Compared to the first quarter of 2023, margin was $0.07 higher in total, driven by transmission at $0.03 per share, gas margin at $0.01 per share and other utility margin at $0.03 per share. Distribution O&M expense increased $0.05 per share compared to the first quarter of 2023 primarily due to gas meter inspections and overhead corrective maintenance following severe rain, wind and flooding events early in the year and tree trimming. Depreciation and interest expense increased by $0.01 per share and $0.03 per share, respectively, compared to the first quarter of 2023, reflecting continued growth and investment. These costs of weight recovery in our pending distribution rate case anticipated to be settled later this year. Lower pension and OPEB income resulting from the cessation of OPEB-related credits, which ended in 2023, resulted in a $0.01 per share unfavorable comparison to the year earlier quarter.
Lastly, the timing of taxes recorded through an annual effective tax rate, which nets to zero over a full year had a net favorable impact of $0.02 per share in the quarter compared to 2023. Weather during the first quarter, as measured by heating degree -- the warmest first quarter in PSE&G's records. As we've mentioned, the Conservation Incentive Program or SIP limits the impact of weather and other sales variances, positive or negative on electric and gas margins while helping PSE&G broadly promote the adoption of its energy efficiency programs. The number of electric and gas customers, which is the driver of margin under the SIP mechanism, continue to grow by approximately 1% over the past year.
On capital spending, as Ralph mentioned, PSE&G invested approximately $800 million during the first quarter, and we remain on track to execute on our 2024 regulated capital investment plan of $3.4 billion, focused on infrastructure modernization and electrification initiatives. These include upgrades and replacements to our T&D facilities, last mile spend in the infrastructure advancement program ongoing gas infrastructure replacement spending, Energy Strong II investments and the continued rollout of the clean energy investments in EE, smart meter installation and EV make-ready infrastructure.
We are reaffirming our five-year regulated capital investment plan of $18 billion to $21 billion. This 2024 to 2028 plan includes the $3.1 billion CEFEE2 filing made in December 2023, which would enable commitments starting January 2025 through June of 2027 based upon the BPU's EE framework with investments filed at the BPU later this year. Moving on to PSEG Power and other, for the first quarter of 2024, PSEG Power & Other reported net income of $0.08 per share compared to $1.60 per share for the first quarter of 2023.
Non-GAAP operating earnings were $0.33 per share for the first quarter of 2024 compared to non-GAAP operating earnings of $0.40 per share for the first quarter of 2023. For the first quarter of this year, net energy margin rose by $0.03 per share, including $0.02 favorable contribution from nuclear driven by the net impact of the nuclear production tax credit which went into effect January 1 of this year, partially offset by a reduction in capacity revenue. Importantly, for 2024, while the PTC begins this year, there will be a shape to our results per quarter as we move through the year. We anticipate realizing the majority of the increase in the 2024 gross margin over 2023's gross margin.
During the second half of the year based upon the shape of our underlying hedges. This will differ from last year when PSEG Power realized most of the step-up in the annual hedge price in the first quarter based on lower pricing in the winter of 2022 compared to 2023. O&M increased by $0.03 per share, mostly driven by the start of the scheduled refueling at our 100% owned Oak Creek nuclear plant. Interest expense was $0.01 unfavorable, reflecting higher interest rates, partially offset by lower short-term debt balances.
Taxes and other were $0.06 per share unfavorable compared to the first quarter of 2023. And primarily reflecting the use of a higher effective tax rate in the quarter that will reverse over the balance of 2024. From an operating standpoint, the nuclear fleet produced approximately 8.2 terawatt hours during the first quarter of 2024 compared to 8.4 terawatt hours in the year earlier period and ran at a capacity factor of 96.8%. Our Hope Creek nuclear unit is undergoing its scheduled refueling outage, which will include preliminary work on the fuel cycle extension project. As a result, as is always the case with outages for our 100% owned Hope Creek unit, we expect a little higher O&M and lower generation in the second quarter. Touching on some recent financing activity.
At the end of March, PCG had a total available liquidity of $5 billion, including $1.2 billion of cash on hand. Our revolving credit facilities totaling $3.75 billion were also extended by one year to March of 2028 during the first quarter. At the end of March, PSEG had $500 million outstanding of a 364-day variable rate term loan, which subsequently matured in April of 2024 and PCG Power had $1.25 billion outstanding of a variable rate term loan maturing in March of 2025.
The entirety of these term loans were swapped from a variable rate to a fixed rate, mitigating the fluctuations in interest rates. As of the end of March, given our swaps and cash position, we had minimal variable rate debt. In early March, PSE&G issued $1 billion of 10- and 30-year secured medium-term notes consisting of $450 million at 5.2% through March 2034 and $550 million at 5.45% due March 2054. A portion of the proceeds was used to pay the maturity of $250 million of 3.75% secured MTMs on March 15.
Later in March, PSEG issued $1.25 billion of senior notes, consisting of $750 million at 5.2% through April 2029 and $500 million at 5.45% due April 2034. A portion of the proceeds will be used to pay the maturity of $750 million of 2.875% senior notes in June. We continue to maintain solid investment-grade ratings. Looking ahead, we expect that PSE&G's considerable cash generation, combined with PSEG Power's enhanced cash flow visibility from the nuclear PTC will support the execution of PSEG's five-year capital spending plan dominated by regulated capex without the need to issue new equity or sell assets.
In closing, we are reaffirming PSEG's full year 2024 non-GAAP operating earnings guidance of $3.60 to $3.70 per share, which reflects continued rate base growth from ongoing regulated investments offset by higher depreciation and interest expense that will build over the balance of 2024 as we await resolution of our pending distribution rate case later this year. We are also reaffirming our forecast of long-term 5% to 7% compound annual growth in non-GAAP operating earnings through 2028, supported by our capital investment programs and the new nuclear PTC.
That concludes our formal remarks, and we are ready to begin the question-and-answer session.