Anthony Guzzi
Analyst · KeyBanc Capital Markets
Thanks, Mark. And I'm going to be on Page 12, remaining performance obligations by segment and market sector. Much like the last quarter, the second quarter was another strong project bookings quarter for the company. We continue to experience core demand across all our segments and many of our market sectors. Total company RPOs at the end of the second quarter was $6.4 million, [indiscernible] or [indiscernible] over June 30, 2021, total of $5.1 billion. Measuring from the end of 2021, RPO [indiscernible] $862 million thus far this year or a strong 15.4%. Additionally, second quarter project bookings were likely strong by an increase of RPOs of $508 million from this year's first quarter. Almost all of the RPO increase this quarter was organic.
Growth was broad-based, with each of the 5 segments growing RPO totals from both the year ago and 2021 periods. We are positioned in active nonresidential market sectors and continue to see velocity in our business.
The 1-2 punch we highlighted in our first quarter call continued this quarter, where we experienced both strong revenue growth and total RPO growth. While some RPO growth thus far could be attributable costs due to outside factors, we continue to see an active bidding environment despite current supply disruptions and inflation challenges. Together, our domestic construction segments experienced strong project growth year-over-year, RPOs increasing over $1 billion or 25% from June 2021. The Mechanical Construction segments or RPOs increased by [indiscernible] or 23% while the Electrical Construction segment saw an increase of $350 million or nearly 30%. Since September '21, our domestic [indiscernible] segment RPOs have increased over $600 million.
U.S. Building Services RPO levels increased $328 million or 44% from the year ago quarter and now is over $1 billion in quality projects and service [indiscernible]. As I mentioned earlier, extended lead times for HVAC equipment, combined with a continued push for energy efficiency and improving building wellness is resulting in our customers asking us to retrofit and repair their equipment. Additionally, strained equipment availability is driving our repair service, which is [indiscernible] grow margin work that we do at EMCOR.
Moving to the right side of the page, we show RPOs broken down by market segment. Continuing to trend, RPO growth was based in the second quarter across market sectors with RPOs increasing almost $1.1 billion. $700 million of which was booked in the first half of 2022. Also, moving to this $1.1 billion increase for projects in the hyperscale data center, high-tech semiconductor arena as well as projects within [indiscernible] sciences and the pharma businesses. All of this shows the diversity and strength of EMCOR's end markets.
Finishing our sector RPO growth year-over-year, health care RPOs are up 10%, institutional [indiscernible] and short-duration projects, which includes much of the HVAC retrofit project work are up 26%. Partially offsetting this was a reduction in transportation RPOs and as well as minor decreases in water and wastewater and industrial and manufacturing. From both a business segment and market perspective, I continue to like the balance and breadth of our RPOs.
We get to go to my -- one of my favorite slides, which is Page 13. And I'd like you to turn there now, and we can talk about why we remain optimistic about EMCOR for the future. On this page, you see well positioned in growing nonresidential market interest. And I'm going to talk about each of these in turn. Data centers and semiconductor fabrication. And we have big news today in the semiconductor front and EMCOR will benefit from that because we are working with all those customers that will benefit. We'll see strong electrical, mechanical and fire protection demand across all those opportunities in semiconductors. And EMCOR is positioned well in Arizona, specifically mechanically. We are positioned well across the entire geography where there'll be some projects done with fire protection and capability in Arizona and burgeoning [indiscernible] Ohio on the [indiscernible] sector front.
Data centers, it's tried to say, I believe there are none better at mechanical and electrical construction within data centers than our own companies. We have leading positions in some core geographical markets, and we can build from an enterprise level [indiscernible] to a high-tail data center using 50 megawatts hour. Our folks are terrific. And those teams in Portland and Salt Lake, Dine D.C., Gibson, Forest. These people are except data center builders on the electrical side. On the mechanical side, Bachelor & Kimball, Pool and Kent, F&G, our exceptional data center builders. They know their work. We're trusted by both our general contract customers and our owner customers. They come to us because we have great technical skill and they know that we have the financial strength to complete and finish those projects.
In the industrial and manufacturing side, we are very well positioned. Mark talked about some of the ability to bring together a prime project across a number of trades, especially for plant relocations. We also are market leaders in food fabrication. If you go to that trade business, there are none better than Southern industrial contractors down in the Southeast. And they also move up into the lower Midwest. And we not only help people fix their existing facilities. We help them upgrade where they are [indiscernible] in moving and relocating equipment and building and manufacturing capacity.
Our food processing expertise is [indiscernible] through our Shambaugh & Son. And we also, across a fleet of things are -- we can do as much as electrical charging station work [indiscernible], we need to be at the higher end of that, and we do that exceptionally well.
Health care, that's always been a core market for EMCOR. We were integral and a lot of the things that had to happen within the pandemic to build extra capacity within the ecosystem. And we are now part of the retrofit and expansion of not only hospital systems, but medical buildings and outpatient surgery centers.
Water and wastewater our market really for that for the most part. We do electrical work at different parts around the country. The bigger part of that work is mechanical. The team down at pool and Ken South and to some extent, Harry Pepper are very good at that work. And the [indiscernible] team has had a leading position in both the East and West Florida and helping with the population in the consent decrees that have happened there.
Mechanical Services, if we are leading, we are within the top 3 of people that can provide mechanical services solutions. And those solutions that we provide not only provide efficiency, they provide building and resiliency, and they also now, with the pandemic, wellness has even become more important. The building efficiency is one of the major ways that you can drive carbon reduction. [indiscernible] happening across our footprint, right? Because as you increase the building wellness and increase outside air coming in, you have to even seek more efficiency within the building because outside actually at the detriment of building efficiency. It's a wonderful [indiscernible] for our people to meet our customers and for us to meet our carbon reduction goals that people -- that are client set. And we do that also through control solutions.
Fire protection, there are none better then the teams of Shambaugh & Son and [indiscernible] to bring a solutions to some of the most complex service and construction jobs. And I'd be remiss not to say [indiscernible] also are going to be big participants across the portfolio of projects, not only renewables, but carbon reduction and capture project. We like our position that work, for the most part, is happening in segment. A lot of it's been delayed. And in our Industrial segment, where [indiscernible] will participate in solar projects, and they also help within wind projects on the transmission side as does Wasatch out in the Intermountain area.
[indiscernible] participate a lot of robust market go up and down a little bit. But the general trend of these markets that I just went through are up into the right -- we spent a lot of time putting the assets in place, and we've got some of the best teams in the market executing against these opportunities.
I'm going to go to Page 14 and 15 now. and I'm going to close off this discussion, and we'll take your questions. Entering this year, we knew that we would face some margin challenges. We were all the way back in February 2021, talking about supply chain with our year-end '21 call. And we also knew that because of our product and project mix, and you couple that with what we thought was happening with supply chain and COVID disruptions. I think our teams have done a great job in [indiscernible] these challenges in this operating environment. and we are pleased with our current position. We talked about demand for our services remain strong across most of our most important market sectors and in all of our reporting segments.
As a result, we're going to update our guidance range. We now believe that we will achieve $7.30 to $7.80 in earnings per diluted share, and we expect at least $10.8 billion in revenue. Where we end up in that range, and I always sort of provide a road map of what could give you the ups or down. Where we end up in that range will depend not only on our execution, but also equipment and material [indiscernible]. We anticipate that we will continue to experience supply chain challenges. We do expect to convert operating income margins of 5% for the remainder of 2022, similar to what we achieved in the first half of the year. If we approve from margins due to better supply chain execution and improved productivity, we could see even stronger results in the back half of the year.
How do you get there? And what are the backers that drive that? We expect to continue to achieve favorable SG&A leverage as compared to 2021. We expect to see strong project demand across key market sectors like industrial, manufacturing, health care and commercial, which includes both data center and semiconductor projects. We expect demand to be strong across a range of project sizes and scopes. We believe we'll continue to see very strong HVAC repair service demand as trends we observed this quarter continue through the third quarter. The summer heat we are seeing helps us.
[indiscernible] a more normalized fall turnaround season in our Industrial Services segment with our oil and gas customers and our refining and petrochemical customers. We should start executing some renewable energy projects that are delayed because of material availability.
While we are pleased with our current trajectory and optimistic about the balance of the year, we are also aware that we will continue to face headwinds in the near term. COVID is still here. And while we believe we have the systems in place to navigate and mitigate its challenges and keep our workforce safe, we expect that some project sites will be disrupted. Further supply chain issues exist with availability, delivery and pricing all [indiscernible] challenges. This will continue in my estimation through the balance of 2022 into 2023.
Finally, with respect to challenges, we cannot ignore certain [indiscernible] in our macro environment. Rising interest rates, [indiscernible] lending and energy scarcity, exacerated by the conflict in Ukraine and other policy matters will cause issues. To date, as evidenced by our strong growth in RPOs, we believe we have the resilient market to operate in. However, when the leaders of major financial institutions cost projected market conditions, we [indiscernible] and we realize that it will likely [indiscernible]. We believe the outlook is strong despite all that, as evidenced by our year-to-date performance and our record RPOs of $6.5 billion.
Our confidence in our business is reflected capital allocation strategy as we have returned a record amount of cash to shareholders, up $468 million through June 30, 2022. We announced an increase in our dividend by approximately 15% or $0.08 per share per annum, and our Board has provided, as Mark talked to our announcement today, an additional $500 million in authorization for share repurchases. We will continue to take a balanced approach to cash management, considering all the implications for maintaining and deploying funds, including maintaining cash and a strong balance sheet for our sureties, our investment in our organic growth, which has been quite strong, our acquisitions and our customer expectations for our financial strength. This approach to capital allocation has historically served us well. especially in periods of economic uncertainty. We [indiscernible] support our organic growth, and we have a decent pipeline of acquisitions to invest in across our segments.
As always, I'd like to thank you for your interest in EMCOR. And I would like to especially thank all the members of our EMCOR team for their continued dedication, hard work and execution for our customers. And with that, I will ask Andrea to open the floor for your questions.