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Operator
Ladies and gentlemen, good day, and welcome to the Southwest Gas Holdings First Quarter 2022 Earnings Conference Call. (Operator Instructions) As a reminder, today's conference is being recorded.
I would now like to turn the call over to Boyd Nelson, Vice President, Strategy and Investor Relations for Southwest Gas. Please go ahead, sir.
Boyd S. Nelson - VP of Strategy & IR
Thank you, David. Good afternoon, everyone, and welcome to the Southwest Gas Holdings First Quarter 2022 Earnings Call.
Throughout the call, we will be referencing presentation slides, which we have posted on our IR website.
I am joined on today's call by Karen Haller, new President and CEO of Southwest Gas Holdings; Paul Daily, President and CEO of Centuri; Greg Peterson, Senior Vice President and Chief Financial Officer; and Justin Brown, Senior Vice President and General Counsel of Southwest Gas Corporation.
Please note that on today's call, the company will address certain factors that may impact this coming year's earnings and provide some longer-term guidance. Further, our attorneys have asked me to remind you that some of the information that will be discussed today contains forward-looking statements. These statements are based on management's assumptions, which may or may not come true, and you should refer to the language on Slides 34 and 35 of this presentation as well as in the press release and also our SEC filings for a description of the factors that may cause actual results to differ from our forward-looking statements. All forward-looking statements are made as of today, and we assume no obligation to update any such statements.
With that, I'll now turn the call over to Karen.
Karen S. Haller - President, CEO and Chief Legal & Administrative Officer
Thanks, Boyd, and good afternoon, everyone. I'm pleased to join you today as President and CEO of Southwest Gas to discuss the company's first quarter results and provide an update on our strategic alternatives process and the announcements we made last week.
First off, turning to Slide 5. John Hester has retired as President, CEO and Board member of the company, and I have been appointed by the Board to serve as President and CEO. I've worked with John for many years, and I know I speak for all Southwesters in thanking him for his leadership and service to our community. Looking to the future, I'm excited to step into this role at such an important time for the company.
Before I begin discussing the company, I'd like to briefly cover our agreement to settle the proxy contest with Mr. Icahn and his affiliates, covered on Slide 6. Our Board received valuable feedback from our stockholders and determined the best course of action was to eliminate the uncertainty of the proxy contest and concentrate on the strategic alternatives review process. We are committed to continuing valuable engagement with our investors as we work to execute on our strategy to maximize value for all stockholders.
Some of the key terms of our settlement agreement with Mr. Icahn are outlined here. First off, at least 3 and up to 4 new directors will join the Southwest Gas Board. The details around this are as follows.
Mr. Icahn has the right to appoint at least 3 directors effective immediately following the annual meeting. These directors are Andrew Evans, Russell Frisby, Jr. and Henry Linginfelter. A fourth director will join the Board in the event that the company determines not to spin off Centuri. This fourth director will be Andrew Teno, unless he is otherwise already appointed to the Board, in which case, one of Mr. Evans, Mr. Frisby or Mr. Linginfelter will be appointed instead. The decision on whether to spin off Centuri will be made within 90 days after the date of the settlement agreement.
Mr. Icahn may also elect to have Mr. Teno replace 1 of the 3 new directors within 90 days after the date of the settlement agreement. Current Board members, Bob Boughner and Thomas Thomas have resigned effective immediately following the annual meeting. Current Board member, Jose Cardenas, will resign from the Board if and when a fourth new director joins the Board. Our current Board member, Renae Conley, will be appointed as Chair of the Board following the annual meeting.
Taken together with my addition to the board following the annual meeting, the Board will comprise 11 directors, 10 of whom will be independent. Also, the Board's strategic transactions committee will be expanded following the annual meeting to comprise 6 new members. These members will be 3 current directors, and existing committee members, Anne Mariucci, Carlos Ruisanchez, Jane Lewis-Raymond; and 3 new directors, Mr. Evans, Mr. Frisby; and Mr. Linginfelter. When Mr. Teno joins the Board, he may replace one of the new committee members at Mr. Icahn's discretion.
Some other key terms of the agreement are as follows: Mr. Icahn has agreed to withdraw his slate of director nominees with respect to the annual meeting and will vote in favor of our nominees. We've agreed to amend the terms of the Southwest Gas stockholder rights plan to increase the triggering percentage from 10% to 24.9%. Mr. Icahn will amend his $82.50 tender offer to extend the expiration date to the date that is 10 business days following the date of the amendment. As part of that amendment, he will purchase shares validly tendered and not withdrawn as of that date, subject to the 24.9% ceiling. Mr. Icahn will further extend -- or will not further extend or amend his tender offer.
The agreement also includes customary standstill and voting commitments. These will extend until 30 days prior to the end of the advanced notice period for the 2024 Annual Meeting in the event there is a definitive agreement for the sale of the entire company or our natural gas utility. Otherwise, they extend until 30 days prior to the end of the advanced notice period for the 2023 Annual Meeting. While the standstill is in effect, Mr. Icahn has agreed to vote all of his shares in favor of any Board-approved sale of the entire company or its natural gas utility Southwest Gas Corporation.
Finally, in order to provide stockholders with adequate time to review the terms of the settlement agreement, we rescheduled the company's upcoming annual meeting to May 19. The record date of March 21, 2022, remains unchanged.
Now turning to Slide 7. I can provide an update on the strategic alternatives process. As we previously talked about on April 10, 2022, the Board received a credible attractive written proposal to acquire the whole company. After our legal and financial advisers engaged in follow-up discussions with the potential acquirer over the next several days to clarify certain elements of the proposal, our Board concluded that commencing a formal process to review strategic alternatives would be in the best interest of all our stockholders. To lead the process, our Board formed a dedicated strategic transactions committee, which, as I mentioned, will now comprise 6 directors. The expanded strategic transactions committee has deep collected regulatory and M&A experience and expertise.
As part of the strategic alternatives review process, we will consider all available alternatives in pursuing the option that will create the most value. These include considering the sale of the company, a separate sale of one or more of its business units and/or the spin-off of Centuri, which is expected to be tax-free to stockholders. The committee also engaged its own independent financial adviser, Moelis & Company, to work with the company's lead financial adviser, Lazard, to conduct a thorough auction process. We are confident that there will be significant interest in Southwest Gas.
Moving on to Slide 8. As you can see, we have 3 independently strong businesses under a consolidated platform. This provides a position of strength and offers many paths for value creation for all our stockholders. The Southwest Gas utility delivered $187 million in net income in 2021. We are positioned for value creation with stable long-term rate base growth of 5% to 7%, driven by $2.5 billion to $3.5 billion of investments over the next 5 years. Mountain West, with its unique structurally advantaged critical infrastructure, has deep, long-term customer relationships. More than 90% of Mountain West revenue is contracted, and over 70% of revenues are backed by investment-grade customers.
Finally, Centuri has been completely transformed from a low-growth infrastructure services company focused primarily on gas utility customers to a scaled, pure-play utility services platform in attractive end markets with a high-quality business model. We are confident in Centuri's long-term prospects, founded on a proven performance track record of a 17% compound annual revenue growth rate over the last 10 years.
I'll now turn the call over to Justin to discuss our utility business and our rate case activity.
Justin L. Brown - Senior VP & General Counsel
Thank you, Karen. Starting on Slide 10. We continue to focus on working with all stakeholders to secure positive regulatory outcomes. Most recently, this was in the form of a settlement in our Nevada rate case that was approved by the commission, with rates effective April 1, 2022. The settlement resulted in an increase in revenues of just over $14 million relative to an increase in rate base of nearly $250 million for a total authorized rate base in Nevada of $1.7 billion. The settlement also provides for an improved ROE of 9.4% relative to a 50% equity ratio. We also received approval to continue our decoupling mechanism, which included a proposal to add certain large commercial customers, which incrementally improves revenue stability and the amount of revenue we have under our decoupled rate structures.
We continue to make progress in our $90 million Arizona general rate case that was filed in December 2021. If approved, we expect this will result in a nearly 40% increase in rate base or $711 million, of which $190 million is part of our proposed 12-month post-test year plan adjustment. The proposed $90 million increase in revenues is also reflective of our proposed 9.9% ROE and 51% target equity ratio. Another component to the case we are really excited about is our Move2Zero Carbon Offset Program. This is similar to the program that was recently approved in Nevada, whereby customers who would like to move towards becoming net zero or carbon neutral will be given an option to purchase carbon offsets that will offset their individual combustible-related greenhouse gas emissions.
We continue to meet periodically with staff/intervenor to discuss the filing and any questions they may have. We are scheduled to receive their testimony in July, with hearings beginning in late September 2022.
Turning to Slide 11. A common theme in our rate case activity has been a significant rate base growth we continue to experience. Our investments in our system have been driven by new customer growth, robust pipeline, replacement efforts and capital tracker programs where we have partnered with our regulators on different investment opportunities as well as a variety of service territory expansions. These various investments in constructive regulatory mechanisms have supported a 79% increase in rate base since 2016.
As shown on this slide, we have a strong track record of working with stakeholders to ensure we have the necessary regulatory or legislative frameworks in place to continue to make the capital investments necessary to meet and exceed the expectations of our customers and regulators when it comes to delivering safe, reliable, affordable and sustainable gas service.
We remain focused and committed to continuing to work with all stakeholders to identify and execute on additional opportunities that will be presented by the attractive service territories that we serve.
Now I'll turn the call back to Karen to discuss Mountain West.
Karen S. Haller - President, CEO and Chief Legal & Administrative Officer
Thanks, Justin. Turning to Slide 12 to discuss Mountain West, an attractive asset with incredibly strong customer base, evidenced by deep, long-term relationships and solid customer credit profile.
In service of these customers, Mountain West has proven itself as a critical platform and key intermediary for its customer base. We believe this substantially minimizes recontracting risk, and we believe there is more value to be unlocked in Mountain West. As I mentioned, we also have investment opportunities that offer the potential for significant growth.
Turning to Slide 13. One example is our Carbonate Tap Expansion, which held a successful open season. We are targeting a July 1, 2023 target in-service date and expect it to deliver capacity of 47,000 Dth per day volume over a 15-year term. We also have other expansion projects that would provide additional delivery and receipt points for increased capacity, ranging from approximately 30,000 to 325,000 Dth per day.
In summary, Mountain West is expected to deliver significant value for our stockholders.
Now I'll turn the call over to Paul to talk about Centuri.
Paul M. Daily - President & CEO of Centuri Group, Inc.
Thank you, Karen. Now turning to Slide 14 and Centuri. Southwest Gas acquired Centuri for $25 million in 1996, and since then has built Centuri into the scaled business that it is today, a business that generated record revenues of $2.5 billion on a pro forma basis in 2021.
Having delivered sustained organic growth and with the addition of successful acquisitions like Link-Line, Neuco, Linetec and, most recently, Riggs Distler, Centuri has substantial scale, capabilities and geographic diversity. With our North American focus on utility infrastructure investment and long-term multi-decade relationships with blue chip customers, Centuri is well positioned to deliver consistently strong earnings and cash flow.
As Greg Peterson will note during the full company guidance, Centuri reaffirms its guidance for 2022 and is also expecting strong sustained growth during the 2022 to 2026, 5-year period, including: revenue compound annual growth rate of 7% to 8%; adjusted EBITDA compound annual growth rate of 9% to 11%; adjusted EBITDA margin of 11.5% to 13% by 2026 and beyond; and a more diversified gross profit by work type, with more even split between gas and our electric business.
Moving to Slide 15, you can see that Centuri is very well positioned to benefit from what many trade sources forecast to be decades of heavy investment across our end markets of electric, gas, 5G datacom and energy transition, which includes offshore wind renewables.
Before I turn the call over to Greg, I'd like to highlight just a few of the very recent contract awards, extensions or expansions that support our long-term growth expectations. These include: $125 million offshore wind support contracts that are in backlog and that we are mobilizing for later this quarter. Several additional offshore contracts are pending award that would be performed over a multiyear period. It should be noted that the magnitude of these contracts is very significant in comparison to the existing offshore wind contracts we already have in backlog.
A new multiyear MSA contract was recently signed for 5G datacom work with a new client in the Northeast. Cross-selling between Riggs Distler and Linetec resulted in expansion of an existing Riggs contract into additional 5G datacom work over the next 5 years throughout the Southeast United States. Linetec's electric transmission and distribution crew count has expanded by over 25% in the past 2 quarters alone, providing additional work for our existing customers. And we negotiated contract modifications and extensions with 2 of our largest gas LDC customers for increased scope and higher rates, spanning multiyear durations.
With that, I'll turn it over to Greg to discuss first quarter 2020 business results and performance highlights.
Gregory J. Peterson - Senior VP & CFO
Thanks, Paul. Earlier this afternoon, we announced our first quarter 2022 earnings and provided segment financial and some additional statistical information. We will file our first quarter 2022 Form 10-Q tomorrow with the SEC. Please refer to these documents for a comprehensive analysis of our first quarter results.
As shown on Slide 17, adjusted consolidated EPS was $1.74 per diluted share for the first quarter of 2022. We are focused on delivering value to our stockholders, providing excellent service to our customers and enhancing opportunities for our employees. Let me touch on some of the highlights at our operating segments.
At Southwest Gas, our natural gas distribution utility, we continue the trend of growing our customer base, adding 38,000 customers over the past 12 months. Those new customers provided about half of the $14 million margin increase between quarters, with the other half coming primarily from recoveries under the VSP and COYL programs in Arizona as well as rate reliefs in California. For the quarter, we invested $141 million in the expansion, safety and reliability of our natural gas distribution system to better serve our customers. We also completed a $600 million debt financing for 10 years at 4.05%.
At Mountain West, we recorded $67 million of revenue during our first quarter of ownership and recognized adjusted net income of $23.5 million. Both were consistent with our internal expectations. In March 2022, Southwest Gas Holdings issued $468 million of common stock as part of the permanent financing for our acquisition of Mountain West. This is about half of our originally estimated equity raise and completes the equity component of the Mountain West financing.
At Centuri, first quarter revenues were $524 million, reflecting 13% organic growth. Coupled with the addition of Riggs Distler, total revenue growth was 44% when compared to the first quarter of 2021. Centuri bottom line results were hampered by higher fuel costs for its significant fleet of trucks and equipment. Acquisition-related incremental interest expense and intangible amortization expense also impacted net income. As a reminder, the first quarter is Centuri's lowest-performing quarter due to seasonality of work availability, especially in the Midwest and colder climate areas in the East. Centuri remains on track to meet full year 2022 revenue and EBITDA margin guidance.
With that, let's move to the next slide and a comparative summary of the results from our 3 operating segments. As shown on Slide 18, consolidated adjusted net income was $106 million in the first quarter of 2022 compared to $117 million in the first quarter of 2021. The $8 million increase in net corporate and administrative costs between quarters consists primarily of incremental interest associated with the acquisition of Mountain West. It also includes about $3.8 million pretax of proxy contest and related litigation costs, which are components of the $10 million adjustments line item. I'll touch upon each of the operating segments in the next several slides.
Slide 19 depicts the comparative results of the Natural Gas Distribution segment. Despite a $14 million increase in operating margin, 2022 quarterly results declined from the record first quarter results of 2021. The cash surrender values of COLI policies declined by $2 million during the current quarter due to the overall decline in the stock market, while the prior year quarter reflected a $2.7 million increase. The $13.5 million O&M increase includes $3.5 million related to higher costs for customer service support systems. Higher service-related pension and employee benefit costs as well as increased insurance and other inflationary impacts were also experienced. Depreciation was up $3.4 million or 5% between quarters due to a $564 million or 7% increase in gas plant in service.
As indicated, we began recognizing incremental rate relief in Nevada in April that will bolster our results for full year 2022. As Justin indicated earlier, incremental rate relief in Arizona is expected in early 2023.
Slide 20 shows the first quarter results of Mountain West since we acquired them on December 31, 2021. Both adjusted net income and adjusted EBITDA were consistent with our internal expectations.
Slide 21 provides a comparative view of the seasonal net losses for the quarters and adjusted EBITDA levels at Centuri.
Let's move to Slide 22, which provides some additional details. This waterfall chart depicts the major components of the change in Centuri's results between quarters. As shown in the first quarter of last year had about $6 million or $4.5 million net of tax of favorable items, including timing of a change order and work on some larger gas projects due to favorable weather conditions. Our acquisition of Riggs Distler in August resulted in a $5 million increase in noncash amortization of intangibles.
Interest expense increased nearly $10 million between quarters, including incremental amounts associated with the expanded secured term loan and credit facility. Fuel costs increased between quarters primarily due to a significant spike in retail fuel prices to which we attribute $5 million of the cost increase.
Moving to Slide 23, we outlined some of the items shaping our view for Centuri's results for full year 2022. As indicated previously, Centuri's business is seasonal, and the first quarter is generally the lowest-performing quarter and is not an indication of full year results. We are excited about the growth prospects of Riggs Distler, but some of the anticipated work has been delayed due to a combination of customer specification changes and supply chain issues. Overall, our backlog has increased 12% since the acquisition of Riggs Distler. Over $125 million of offshore wind support work is on tap to begin in the second half of this year, and we are anticipating other multiyear awards.
Linetec continues to experience growth with both existing customers and new customers. We expect the ramp-up of work with our large gas utility projects and have made contract modifications to shore up our profit margin.
Let me now move to Slide 25 and our company guidance for 2022 and beyond. For our utility operations at Southwest Gas, we estimate net income will be $200 million to $210 million. Operating margin will continue to benefit from ongoing customer growth, recoveries of previously deferred amounts in Arizona and refresh rates in Nevada. We continue to estimate COLI income of $3 million to $5 million in 2022.
Investments in our natural gas distribution will be $650 million to $700 million during 2022 and are expected to be $2.5 billion to $3.5 billion through 2026, resulting in rate base increasing at a compound annual growth rate of 5% to 7%. Additionally, return on equity at the utility for 2023 forward is expected to be 8-plus percent. And our 5-year O&M per customer compound annual growth rate is targeted at less than 1%.
At our newest subsidiary, Mountain West, we anticipate revenues will be $240 million to $245 million in 2022 with a run rate EBITDA margin of 68% to 72%. We are on track in our integration plan of Mountain West and are already benefiting from strong operating cash flows from this acquisition. Adjusting for onetime integration and overlapping costs, we reiterate that Mountain West will be accretive to EPS in 2022 and beyond. As Karen previously discussed, we identified $100 million in incremental growth CapEx investment at Mountain West over the next 3 years.
At Centuri, we expect 2022 revenues to be $2.65 billion to $2.8 billion, driven by growth in all facets of the business and especially at recently acquired Riggs Distler. While we expect some incremental costs during this potential separation transition period, normalized EBITDA margins are anticipated to be 11% to 12%. For 2022 to 2026, we are forecasting an adjusted EBITDA compound annual growth rate of 9% to 11%. Let me conclude by saying that overall, we reaffirm our 2022 guidance.
Before we turn the call over to the operator for Q&A, Karen has some closing remarks.
Karen S. Haller - President, CEO and Chief Legal & Administrative Officer
Thank you, Greg. I want to touch on a couple of the key points we've made today. We have compelling opportunities in each of our businesses that we continue to pursue. We are pleased to have settled the proxy contest with Ms. Icahn so we can focus on completing a well-run, successful strategic alternatives process to maximize value for all stockholders. And we are confident that there will be strong interest in Southwest Gas as we conduct an expeditious review of strategic alternatives.
With that, I'll turn it over to the operator to explain the process for asking questions.
Operator
(Operator Instructions) And we will take our first question from Richard Sunderland with JPMorgan.
Richard Wallace Sunderland - Associate
I appreciate the update kind of across the board here. But maybe I wanted to start on some of the settlement language at first. Particularly around the Centuri spin and the 90-day window, is that indicative of kind of a 90-day decision around interest in a whole company sale with Centuri then being kind of the alternative path forward in terms of the tax-free spin? Or just any high-level color you can lay out around the process for the company versus Centuri would be helpful.
Karen S. Haller - President, CEO and Chief Legal & Administrative Officer
This is Karen. And yes, with respect to the 90 days, we are looking to make some type of determination with respect to whether the best alternative is to spin Centuri. We're really looking at all alternatives at this point. So the idea is to maximize value for all shareholders, and we don't know what that is at this point. And so the 90 days is to give us the opportunity to make a determination as to whether the best alternative is to spin Centuri or not.
Richard Wallace Sunderland - Associate
Understood. So just in terms of 90 days then, is that kind of process-wise, the next time frame to look at for an update, absent some sort of announcement sooner?
Karen S. Haller - President, CEO and Chief Legal & Administrative Officer
We really want to be as transparent as possible with all of our stockholders. And so as soon as we have additional information to update, we will do so. It may be prior to that and it may not be, depending upon the process. We're really focused on running a well -- really well-run process at this point, and we don't know -- it will be timely and focused, but we don't know exactly the timing on all of that.
Richard Wallace Sunderland - Associate
Got it. That's helpful. And then maybe just turning to the results themselves, could you speak a little bit more to the inflation impacts on the quarter? And I guess, what offsets you're seeing to stay within the 22% range.
Gregory J. Peterson - Senior VP & CFO
Yes, this is Greg. Certainly, inflation has had an impact. And I think for -- not only for us, but for all companies, certainly, in the United States. And we are working with that. I personally think, and I think as we look forward, we anticipate that the inflationary impacts will somewhat diminish as we move throughout the year.
We know that interest rates, on the other hand, will feel some of the impact as those rates are being moved upwards by the Fed. But we think that we are still on track for our 2022 guidance and are working to mitigate the impacts of inflation on our operations.
Richard Wallace Sunderland - Associate
Got it. So are you targeting kind of a catch-up over the balance of the year? Or did you have some cushion already baked in that's basically bearing the inflation now?
Gregory J. Peterson - Senior VP & CFO
As I mentioned, Rich, we're monitoring and certainly working to minimize the impacts of inflation. I don't think we ever really have cushion in our expectations, but we do have a range of expectations, and we're working to stay within that range.
Operator
And we'll take our next question from Julien Dumoulin-Smith with Bank of America.
Julien Patrick Dumoulin-Smith - Director and Head of the US Power, Utilities & Alternative Energy Equity Research
Congrats to Karen for the promotion here. If I can jump into the process here, I want to word this carefully, just given the parameters of the call. But broadly speaking, what level of interest have you received already? Can you speak to the inbounds? It seems as if you've affirmed some level of interest already.
And then given the backdrop of rising rates, and you've been running the process for a bit, can you talk a little bit about how that could be impacting the process altogether here? I'll let you guys respond as open ended as possible here, just given the sensitivity of -- and your ability to respond.
Karen S. Haller - President, CEO and Chief Legal & Administrative Officer
Thank you, and I appreciate that very much. First of all, we have received multiple inbound interest already. Our financial advisers, really, the direction of our strategic transaction committee are making outbound calls to ensure our process is robust. We believe there will be significant interest in Southwest Gas and its businesses. I'm not going to go beyond that with respect to what inbound calls we have.
Our financial advisers are reaching out and trying to make sure that we're looking at all possible sellers -- or buyers, I should say. And we've sent out process letters containing process details, which provide for confidential information. Parties will need some time to conduct their preliminary due diligence, after which we'll expect nonbinding proposal. From there, we'll analyze the proposals and determine which alternatives will create the most value for our stockholders.
Julien Patrick Dumoulin-Smith - Director and Head of the US Power, Utilities & Alternative Energy Equity Research
Got it. All right. Fair enough. I wish you the best on that effort. And if I can just follow up on a couple of more mundane items here. Specifically, you're just capturing the 5% to 7% rate base CAGR. Your gross CapEx range of $2.5 billion to $3.5 billion, that's a particularly wide range here.
Can you kind of capture how you think about what that rate base and earnings growth could be at the lower and higher end of that CapEx, if you will? Again, understanding that there's obviously a range of recovery scenarios and earned returns that might accompany those scenarios as well.
Gregory J. Peterson - Senior VP & CFO
Yes. This is Greg. I will certainly start, and if Justin has some additional commentary. But certainly, by having a 5-year range of $2.5 billion to $3.5 billion, that is what drives, as you are well aware Julien, the rate base CAGR that we have. We have a solid and quite a large rate base currently existing. And when we finalize the Arizona rate case, we expect to add a significant amount to that. So that will be the big thing.
There is not really much in the way of deferred taxes that come into play when we calculate rate base. So the rate base growth is a direct correlation to the amount of CapEx that we have. And we're just providing ourselves some flexibility to focus our CapEx and both the amount and the timing to the areas that will provide the best benefit for our stockholders and allow us to provide safe and reliable service to our customers.
Julien Patrick Dumoulin-Smith - Director and Head of the US Power, Utilities & Alternative Energy Equity Research
Fair enough. And then the last one, just squeezing in here, if I can. On offshore, as you talk about the various opportunities you alluded to, how substantive could that become as a part of Riggs here? Is there any kind of framework or range that you could offer to the extent in which that you're awarded any number of these opportunities? How meaningful is a percent of total business on any metric could you speak to?
Paul M. Daily - President & CEO of Centuri Group, Inc.
Julien, this is Paul Daily. We have framework agreements in place with the clients that we're working with. And they basically, just as you noticed, have received often, what they call, callouts. Really, the thing that would hold in of a month is more environmental, fishermen or lobster sue and they are successful. But they are pending. They're very material. I don't think I should be saying more than that as far as what percent of Riggs' business it would be, but it's a very bright future.
Operator
And our next question comes from Ryan Levine with Citi.
Ryan Michael Levine - Research Analyst
I guess on the utility process, are you open to selling the utilities in pieces or on a state-by-state basis? And is there a certain ownership percentage that are -- that would trigger certain regulatory reviews in the states that you operate?
Karen S. Haller - President, CEO and Chief Legal & Administrative Officer
This is Karen. So we really have been focused on the process of looking at either to sell the entire company or each one of the individual businesses. So the utility, the Mountain West or Centuri, and not on breaking up the utility into pieces at this point.
You had a follow-up question. What was that?
Ryan Michael Levine - Research Analyst
In terms of ownership percentages, in the 25% that was in the recent settlements, can you elaborate as to why it was 25%?
Gregory J. Peterson - Senior VP & CFO
Yes, this is Greg, Ryan. So you're asking why 25% is -- that is the Nevada threshold. If you have the change in ownership, that requires then Nevada to be involved or allows them to be involved in that process. So I think you can find some correlation between that and the 24.9% that we are affording through the poison pill to all of our shareholders.
Karen S. Haller - President, CEO and Chief Legal & Administrative Officer
That's right. Each one of the states would require approval, and the 24.9% would require regulatory approval, if we go beyond that.
Ryan Michael Levine - Research Analyst
And what's your tax basis in Centuri as of the end of the quarter?
Karen S. Haller - President, CEO and Chief Legal & Administrative Officer
We've not disclosed that. And at this point, we'll not be disclosing that. But the tax is an important issue with respect to looking at how we separate Centuri going forward and why we've been focused on the spin and doing it in a tax-free manner.
Ryan Michael Levine - Research Analyst
Okay. And then last topic for me. In terms of the midstream CapEx $100 million number that you put out there with the release, what portion of the CapEx is carbonate? And can you provide additional color on the drivers of the other projects?
Karen S. Haller - President, CEO and Chief Legal & Administrative Officer
Yes. The carbonate is a very small portion of that CapEx. The primary piece is related to a project that we'll be going to open season on shortly. It's Overthrust Pipeline. Overthrust Pipeline, there's a lot of demand for expansion. There will be a compression project that will be going out on an open season for. That will take several years to put in place but is a very significant project and allows gas to be -- to flow from east to west. And so we've had a lot of demand from customers for that project.
Operator
(Operator Instructions) And there are no further questions on the line at this time, so this will conclude the Q&A portion of today's conference. I would now like to turn the call back over to Mr. Boyd Nelson for any closing remarks.
Boyd S. Nelson - VP of Strategy & IR
Thank you, David, and thank you all for joining us today. This concludes our conference call. Thank you for your interest in Southwest Gas Holdings. Have a good evening.
Operator
This concludes today's Southwest Gas Holdings First Quarter 2022 Earnings Call and Webcast. You may disconnect your line at this time, and have a wonderful day.