Scott Prochazka
Analyst · Goldman Sachs
Thank you, David, and good morning, ladies and gentlemen. Thank you for joining us today and thank you for your interest in CenterPoint Energy. This is our first quarter presenting combined results and we're pleased to be talking with analysts about the post merger company. We're also pleased with our integration efforts to date and we'll provide more detail on integration later in the call.
I will begin on Slide 5. This morning, we reported first quarter 2019 income available to common shareholders of $140 million or $0.28 per diluted share compared with income available to common shareholders of $165 million or $0.38 per diluted share in the first quarter of 2018. On a guidance basis and excluding merger impacts, first quarter 2019 adjusted earnings were $222 million or $0.46 per diluted share compared with adjusted earnings of $241 million or $0.55 per diluted share in the first quarter of 2018. Notable factors contributing to the $0.07 reduction are $0.07 from our Energy Services business, which is largely timing-related and driven by weather and a $0.02 noncash loss from the dilution of ownership in Enable as a result of the vesting of additional common units under Enable's long-term incentive program. Utility Operations, particularly our natural gas distribution business, had a strong quarter.
Overall, our businesses are performing well and we remain on target to achieve our financial objectives for the year. Increases for the quarter were associated with rate relief, customer growth, lower federal income tax expense and the benefit from businesses added as a result of the merger. These increases were more than offset by the Energy Services and Enable-related impacts I mentioned earlier as well as higher operations and maintenance expense, higher depreciation and amortization expense, lower equity return primarily due to the annual true-up of transition charges and higher financing costs associated with the merger. Our business segments continue to implement their strategies, which are focused on safely addressing the growing needs of our customers while enhancing financial performance.
It is worth mentioning that our first quarter 2018 guidance basis earnings of $0.55 per diluted share represented 34% of total earnings for 2018, largely due to weather-driven opportunities at Energy Services that allowed the company to capture earnings early in the year. By comparison, in the years 2015 through 2017, first quarter guidance basis EPS represented 27% to 28% of our annual guidance basis EPS. Considering this more historic distribution of earnings, our first quarter 2019 guidance basis EPS excluding merger impacts is aligned with our EPS guidance range of $1.60 to $1.70 for the year.
Now I will cover business highlights starting with Houston Electric on Slide 6. Core operating income, excluding merger-related expenses of $10 million, was $84 million in the first quarter of 2019 compared to $99 million in the first quarter of 2018. This decline of $15 million includes 2 anticipated reductions: a $10 million reduction in equity return and a $6 million decrease in revenue as a result of tax reform, which is offset by a reduction in income tax expense. Absent these known reductions, Houston Electric was up quarter-over-quarter. Xia will provide more detail later in the call.
On April 5, we filed the first Houston Electric rate case in nearly a decade, requesting an ROE of 10.4% along with a 50% equity, 50% debt capital structure. The rate case includes all invested capital through the end of 2018, including investments made as a result of Hurricane Harvey. After new rates have gone into effect, we anticipate we will seek recovery for investments made since the end of 2018, utilizing our distribution and transmission investment recovery mechanisms, known as DCRF and TCOS, respectively. As a reminder, DCRF is filed in April, reflecting the prior calendar year's qualifying distribution investment and TCOS may be filed twice per year.
We continue to see strong growth in our electric service territory in Texas, adding nearly 41,000 metered customers since the first quarter of 2018. It is worth noting we have added approximately 400,000 customers since the last rate case and we're proud of the part CenterPoint Energy plays in servicing that growth. We included Slide 17 in the appendix to demonstrate the consistent customer growth at Houston Electric over the last 30 years.
Turning to Slide 7. Indiana Electric contributed operating income of $11 million for the February 1 through March 31 period, excluding merger-related expenses of $20 million. In March, the Indiana Utility Regulatory Commission or IURC approved construction of a 50-megawatt universal solar array. In late April, the IURC approved both our plan to retrofit Culley Unit 3 and recover certain costs associated with ash ponds as well as past power plant pollution control investments. These capital expenditures will be recovered through a new annual environmental cost adjustment mechanism. Rather than approve our plan to build a 700 to 850-megawatt combined-cycle natural gas turbine or CCGT, the IURC instructed us to minimize the risk that any one fuel source becomes uneconomic by pursuing multiple smaller scale options. The IURC concluded these smaller scale options would better position Indiana Electric to respond to changing circumstances.
We have begun work on a new integrated resource plan that reflects the direction provided by the commission. This plan is expected to be finalized by mid-2020 and will form the basis for future requests to transform our generation resources.
Approximately $850 million of capital, primarily in the 2021 to 2023 period, is associated with the previously-planned CCGT plant. And while we cannot know the outcome of the new plan until the analysis is completed, we know that alternative capital investments identified in our 2016 integrated resource plan were of similar magnitude. For a complete overview of both electric segments' year-to-date regulatory developments, please see Slide 18.
Now turning to Slide 8. Natural gas distribution operating income in the first quarter of 2019 was $220 million compared to $156 million in the first quarter of 2018, excluding merger-related expenses of $53 million in the first quarter of 2019. This includes operating income from the newly-added businesses in Indiana and Ohio, which Xia will further detail in her walk-through of the segment. Natural gas distribution added nearly 1.1 million customers since the first quarter of 2018, more than 45,000 in legacy CenterPoint jurisdictions and the remainder as a result of the merger. This business continues to benefit from effective annual cost recovery mechanisms, which can be utilized in 7 of the 8 states we serve. These mechanisms include the Gas Reliability Infrastructure Program or GRIP in Texas, the Formula Rate Plan or FRP in Arkansas and the Distribution Replacement Rider or DRR in Ohio. We continue to anticipate a final order from the Public Utilities Commission of Ohio in the second or third quarter of this year regarding the settlement agreement, which reflects a $23 million increase in annual revenues. We anticipate filing rate cases during the fourth quarter in Minnesota and the Beaumont, East Texas jurisdiction. For a complete overview of natural gas distribution's year-to-date regulatory developments, please see Slides 19 and 20. We were pleased with the performance of both the legacy CenterPoint and the newly-acquired jurisdictions.
Turning to Slide 9. Energy Services operating income was $14 million in the first quarter of 2019 compared to $54 million in the first quarter of 2018, excluding a mark-to-market gain of $19 million and a loss of $80 million respectively. On average, roughly 80% of annual operating income is considered base business, with the remainder considered opportunities managing storage assets, which benefit from nonnormal weather in specific locations. Given the extreme weather conditions in the first quarter of 2018, our financial expectations for first quarter of 2019 were below what we achieved in first quarter of '18. Further, market conditions did not support our planned level of optimization in the quarter. As a result, we have assets in storage that we believe better position us to capitalize on opportunities through the remainder of the year. Therefore, under normal weather conditions, we expect full year operating income to be at or near 2018's level of $63 million, excluding mark-to-market impacts.
Infrastructure Services, acquired as part of the merger, is a new business for CenterPoint. This segment is primarily focused on pipeline construction and maintenance for natural gas distribution as well as transmission pipelines for natural gas, oil and liquids. Infrastructure Services had an operating loss of $1 million for February and March as part of CenterPoint Energy, excluding merger-related expenses of $15 million. For reference, the business' full quarter operating loss, including January and excluding merger-related expenses, was $11 million compared with an operating loss of $14 million in the first quarter of 2018 as part of Vectren. This business is typically weaker during the first quarter as less work can be done during cold weather months. However, the backlog for the next 12 months is almost $1 billion, over $200 million higher than the backlog at this time last year, which we believe suggests ongoing strong demand for the business.
On Slide 10, we've captured some of the highlights from Enable's first quarter earnings call on May 1. Enable reported strong rig activity as well as higher volumes of natural gas gathered, processed and transported as well as higher volumes of crude oil and condensate gathered. Enable's recent Gulf Run Pipeline project, anticipated to be completed in 2022, is backed with a long-term agreement with Golden Pass LNG. And we anticipate the project will provide a valuable earnings contribution to Enable for decades to come. We are pleased with Midstream Investments performance.
On Slide 11, we are reiterating our guidance for 2019, our guidance for 2020 and our EPS growth target CAGR of 5% to 7%. We have begun realizing the anticipated merger benefits with more than $50 million of projected cost savings for 2019, excluding costs to achieve. Xia will discuss merger savings and costs to achieve in more detail.
Overall, our businesses are performing well. We enjoy strong fundamentals that will continue to drive our earnings growth. Our continued focus on safety, reliability, customers, communities and financial performance will serve us well as we work to optimize our businesses post-merger.
As many of you know, Xia Liu joined CenterPoint a few weeks as our new Chief Financial Officer. Xia brings with her tremendous experience with more than 20 years in the utility industry, including roles in finance, operations, regulatory and corporate strategy. Today, Xia will cover additional financial details and wrap up the prepared remarks. I also know she's looking forward to catch up with -- catching up with many of you at the upcoming AGA conference. Xia?