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Operator
Good day and welcome to the ONE Gas, first quarter earnings conference call and Webcast. Today's conference is being recorded. At this time, I would like to turn the conference over to Erin Dailey.
Please go ahead, Ms. Dailey.
Erin Dailey - IR
Thank you, Matt. Good morning, everyone, and thank you for joining us on our first-quarter 2024 earnings conference call. This call is being webcast live and a replay will be available later today. After our prepared remarks, we're happy to take your questions.
Statements made during this call that might include ONE Gas expectations or predictions should be considered forward-looking statements and are covered by the Safe Harbor provisions of the Private Securities Litigation Reform Act of 1995.
The Securities Act of 1933 and the Securities and Exchange Act of 1934 each as amended. Actual results could differ materially from those projected in any forward-looking statement. For a discussion of factors that could cause actual results to differ, please refer to our SEC filings.
Joining us on the call this morning are Sid McAnnally, President and Chief Executive Officer; Chris Sighinolfi, Senior Vice President and Chief Financial Officer; and Curtis Dinan, Senior Vice President and Chief Operating Officer.
And now I'll turn the call over to Sid.
Robert McAnnally - President, Chief Executive Officer, Director
Thanks, Erin, and good morning, everyone. We're happy to be with you this morning to discuss our first quarter performance. Based on our first quarter financial results, we are on track to achieve the midpoint of our 2024 financial guidance despite warm winter weather in our service territory.
Our success is made possible by the management of O&M expenses, realizing the efficiencies of bringing functions such as line locating in-house and the diligence of our co-workers in the execution of our strategic plan, we continue to add new meters, which enhances affordability for our customers, and we are engaging in regulatory activity as planned, helping us address the impact of recent economic developments as we maintain our system and fund our growing business.
We remain focused on our primary mission, the safe delivery of reliable natural gas to our customers. We recently learned that we received the American Gas Association Safety Award for having the lowest rate of significant injuries among our peer companies for the seventh-year in a row. This is a remarkable achievement and one that requires a renewed commitment each day to keep our co-workers and customers safe and to operate in a way that's environmentally responsible.
I'm also pleased to announce that as of December 31, 2023, we've achieved a 50% reduction in emissions due to leaks by executing our safety driven pipeline replacement plan. This progress keeps us on track to reach our stated 2035 goal of reducing emissions associated with mains and services by 55%, measured from 2005 baseline, even as we continue to grow our system.
We also learned that we achieved a AAA ESG. rating from MSCI. due to our management of safety and climate related risks. We will continue to provide robust disclosures around our ESG policies and practices, and we'll proactively identify and address related risks.
Now I'll turn it over to Chris to discuss our financial performance for the quarter.
Chris?
Christopher Sighinolfi - Chief Financial Officer, Senior Vice President
Thanks, and good morning, everyone. As Sid noted, we had solid financial performance this quarter despite the headwinds posed by elevated interest rates and persistent inflation. Our teams continue to do a great job managing the risks we can control.
Net income for the first quarter was $99 million or $1.75 per diluted share compared with a $103 million or $1.84 in the same period 2023.
Although weather across our service territories for the first-quarter was 9% warmer than normal. The impact on earnings was not material due to our effective weather normalization mechanism. First-quarter revenues reflect an increase of $11.2 million from new rates and $1.3 million from continued growth in our customer base.
First-quarter O&M expenses were approximately 5% higher than the first-quarter last year. Continuing the moderating trend we experienced throughout 2023 as process efficiencies and the benefits of our in-sourcing efforts have borne fruit. We expect these initiatives to continue to help counterbalance inflationary pressures. And as a reminder, project operating expenses to go to grow by approximately 5% per year through 2028.
Other income net increased nearly $1 million, compared to the same period last year, primarily due to increases in the market value of investments associated with our non-qualified employee benefit plans. Excluding the amounts related to KGSS-I, interest expense in the first-quarter was $1.2 million or roughly 7% higher than the same period in 2023, which reflects higher rates on commercial paper balances, the issuance of $300 million of 5.1% senior notes in December and the maturity of lower coupon notes in February and March.
Last fall, we expanded both our credit facility and commercial paper program each to $1.2 billion from $1 billion. Our short term debt at March 31, is elevated compared to year end 2023 as we pre-funded our February maturity with a senior note issuance in December and initially absorbed our March maturity with commercial paper.
We will look to issue long term debt and exercise our equity forward sales agreements later in the year as construction work and progress becomes used and useful. Also, while our jurisdictions provide effective weather normalization mechanisms, which mitigated the earnings impact of the warm weather we experienced in the first-quarter.
Cash flows were affected as we did not monetize as much gas in storage as we would have under normal weather conditions, higher initial storage balances mean we will inject less this refill season. And so we expect the storage related cash flow impacts to be offset as we move through the next two quarters.
We have forward sales agreements for approximately 3.6 million shares of our common stock with settlement by the end of 2024, at an average price of nearly $77 per share. Had all forward shares been settled. At quarter end, we would have received net proceeds of approximately $274 million. We also have approximately $225 million of equity available for issuance under our at-the-market equity program.
With forward sales executed last year, we have largely satisfied our equity needs for 2024. Yesterday, the ONE Gas, Board of Directors declared a dividend of $0.66 per share, unchanged from the previous quarter. We affirm our 2024 financial guidance, including net income of $214 million to $231 million, earnings per diluted share of $3.70 to $4 and capital investments of approximately $750 million.
Finally, last quarter, I noted the market's vigorous debate about the pace, timing and magnitude of potential interest rate cuts from the Federal Reserve. A discussion, which remains very much alive today and to which the market appears highly responsive.
Accordingly, I thought it worth repeating that our 2024 financial guidance is not predicated upon any rate cuts occurring this year. We did not assume that that would happen. Moreover, given heightened market volatility and consensus interest rate forecasts, which continue to fluctuate we outline the modeling assumptions, which underpin our 5-year guidance in our investor presentations. And I'd point your attention back to them for a sense of our mult-iyear expectations.
And now I'll turn it over to Curtis.
Curtis Dinan - Chief Operating Officer, Senior Vice President
Thank you, Chris, and good morning, everyone. I'll start with a brief update on the storm activity that moved through Oklahoma and Kansas last night. While there was widespread damage in Barnsdall and Bartlesville, Oklahoma, we did not experience any significant system damage and did not have any reported injuries to any of our co-workers.
Turning to our regulatory activities. The Kansas Gas Service rate case was filed in March. We are requesting a $58.1 million net revenue increase based on a 10.25% requested return on equity. And an equity ratio of 59.6%, reflecting our actual capital structure, each 25 basis point change in the requested ROE, results in a revenue change of approximately $2.6 million and each 1% change in the requested equity ratio result in an approximate $1.2 million revenue change.
We also ask the Kansas Corporation Commission to allow a dual rate structure for high and low usage customers and an annual performance based rate adjustments. We expect new rates to go into effect in November.
Texas Gas Service made Gas Reliability Infrastructure Program filing for all customers in the central Gulf region in February, seeking a $12.3 million adjustment with rates to be effective in June. We plan to file a full rate case for the Central Gulf territory in early June. In March, Texas Gas Service made GRIP filings for all customers in the West North service area requesting an $8.6 million increase to be effective in July.
Finally, Oklahoma Natural Gas filed its annual performance-based rate change application in February, seeking a $31.8 million adjustment with rates expected to go into effect in late June.
Turning to our commercial and operating activities, our capital execution continues to be strong with our investments for the first quarter running ahead of the same period last year.
Looking at growth, while the first quarter saw a slight deceleration in the pace of new meter sets, as elevated mortgage rates impact the immediate term decisions of homebuilders and potential buyers. We have set over 7,000 new meters year-to-date through April. 1900 new meters were set in April alone, making this the most active April since 2020.
As we have discussed previously, our region continues to enjoy strong economic growth with new employers moving into our territories, bringing jobs, people and an ongoing need for housing. Our planning and capital execution position us to serve the growing customer base arising from that economic development.
And I'll turn it over to Sid for closing remarks.
Robert McAnnally - President, Chief Executive Officer, Director
Thank you, both. Our success is made possible by the commitment of our coworkers to one another and to our mission. A positive indicator was reflected in the results of our annual gallop employee engagement survey, which looked at the way our co-workers experience work at ONE Gas.
While our engagement scores increased for the eighth consecutive year. We are already working on improvements, reflecting our commitment to provide both industry-leading safety results and the best workplace and customer experience possible while creating long-term value for our shareholders.
As Curtis mentioned last night, a series of storm systems moved through our service territory, and we recognize our teams who responded ensuring that our customers and systems were safe. We are grateful to each and every person who took place part in our response effort. And I'm grateful to each of our 3,900 co-workers for their dedication to safe operations and excellent service to our 2.3 million customers.
Thank you all for joining us this morning. Operator, we're now ready for questions.
Operator
(Operator Instructions)
David Arcaro, Morgan Stanley.
David Arcaro - Analyst
Hey, good morning. Thanks so much for taking my questions.
Robert McAnnally - President, Chief Executive Officer, Director
Good morning, David.
David Arcaro - Analyst
Morning. Is it fair to say then that even with the I guess you've got some debt issuance or refinancing coming up later this year, but just based on where yields are in the market there. And maybe could you just talk through how that is lining up against your financial plan right now? You hadn't been assuming really it's a down tick in terms of yields. So on track so far in terms of what the market is looking like in terms of pricing?
Christopher Sighinolfi - Chief Financial Officer, Senior Vice President
Good morning, David. This is Chris.
I think that's a fair characterization. There's two parts of it to look at it's not only what treasuries are doing at what corporate credit spreads are doing relative to them. And we have seen those gyrate around this year. They have tightened, relative to where they were last fall. And so that's a benefit we also had explained in the fall and it continues to be true that our maturity schedule, as you look out, does afford us some flexibility to consider various tenors. So presently and this has been true since the spin. We have had 5-year notes, 10-year notes and 30-year notes.
And so we continue to look at what that maturity schedule affords us, what treasuries are doing and what our spreads net to those treasuries resultant. But where you started, I think is a fair characterization. Our expectations versus current market realities.
David Arcaro - Analyst
Okay, great. Understood. And then with the Kansas rate case, I was wondering if you could speak to just your thoughts on the potential to settle that case and what the timing would look like for when we should watch for that?
Curtis Dinan - Chief Operating Officer, Senior Vice President
And David, this is Curtis. That case runs typically 240-days, which is the statutory period for rate cases in Kansas. We have typically in the past been able to settle those with the Commission and with the interveners and I've not had to go through a full litigation. So I really won't have any specific comments on the case itself until we get the closer to the end of that timeframe.
Operator
Christopher Jeffrey, Mizuho.
Christopher Jeffrey - Analyst
Good morning, everyone. Maybe just touching on the OpEx inflation that was more decelerated, I think, than from last year's. I just kind of wondering if there's anything specific to this quarter and whether that shaping of the OpEx, you know, more front-loaded still holds true through the 2028 plan?
Curtis Dinan - Chief Operating Officer, Senior Vice President
Chris, this is Curtis, and I'll take the first part of that. And I will turn it to Chris to talk longer term to your question.
But in the near term or in this quarter, specifically, we were seeing the benefits of the effort we made to in-source several functions starting late in 2022 and continuing through 2023. And we're certainly seeing the benefits of having those additional folks with joining our company and providing us the flexibility that we need to operate through the period.
The other thing, I would point out is, as Chris mentioned in his comments, the warmer than normal weather we experienced during the first-quarter, a period like that when it's in the first-quarter, we typically will have less overtime and less pull on our resources. So we also pick up some O&M savings in that type of an environment.
So it's really a combination of those two things primarily.
I'll turn it to Chris to talk a little bit longer term to the rest of your question.
Christopher Sighinolfi - Chief Financial Officer, Senior Vice President
Hey, Chris, good morning. And to Chris's point, we did have some effects in the first quarter. I think as you look out, we had detailed in our guidance presentation back in the fall that arguably the biggest driver over a multiyear period is just going to be what happens with the labor market in our territories and wage inflation generally.
And so there's, the Fed has talked in its most recent meeting last week about paying attention to the labor market and any weakening in the labor market. But that's something that's going to be the primary driver of what happens to our O&M inflation going forward.
I think the capacity building that Curtis, this group did around initial phases and subsequent phases of insourcing have largely been completed. Although we continue to look at opportunities to continue to move the needle on that front. So I think the capacity building side of that is largely behind us.
And now it's just efficiency gains and then riding the tide of what happens with labor market inflation in our territory.
Robert McAnnally - President, Chief Executive Officer, Director
And Chris, I'd only add that, I think the in-sourcing that Curtis mentioned is an example of being opportunistic when the opportunities present. We're always looking for the chance to be both more efficient and more effective. And so the in-sourcing is a good example of a project that started a few years ago as we saw the opportunity to be more efficient.
And then through COVID, as we saw some contractor prices starting to increase, we looked at our entire menu to see are there places that we thought we might could add financial efficiencies as well. So you can expect to see more of that from us when the opportunity presents itself. Thank you for the question.
Christopher Jeffrey - Analyst
Very helpful. And then maybe as I understood from the prepared remarks, we should expect a rate case filing for the Central Gulf in Texas. Just kind of any initial thoughts on that. And maybe as it pertains to the financing outlook for 2024, 2025, any kind of implications around that case?
Curtis Dinan - Chief Operating Officer, Senior Vice President
I'll take the first part of that, Chris.
And then pass it to Chris for the second half of your question again.
But we're still in prep for that rate case right now. As I indicated in my comments, we expect to file that in the early part of June. And until we do that, we won't have any other comments or be able to provide any details, but happy to discuss it once we get past that point.
Christopher Sighinolfi - Chief Financial Officer, Senior Vice President
And then Chris, there's really not a change in any of our financial plans. Obviously, we had talked in the fall and have continued to talk about our regulatory calendar and our regulatory recovery process. And all of that, it is baked into that financial plan that we that we outlined in the call.
Operator
This concludes the ONE Gas, first-quarter earnings conference call and webcast. You may now disconnect.