Is SEI a Buy? What to Consider in 2026

Short answer

The bull case for Solaris Energy Infrastructure (SEI) rests on AI and data center power demand: SEI's power solutions segment is riding surging electricity demand from AI training and data center buildouts, where behind-the-meter and bridge power is scarce. Revenue (TTM) is ~$690M. If you believe that thesis holds, the real questions become position sizing and overlap, not timing. The main risk to that view: Customer concentration is the dominant risk: as of late 2024 a single large customer accounted for the vast majority of power solutions revenue, so any contract change, delay, or non-renewal could sharply affect results. Whether SEI is a buy comes down to whether you believe the thesis. This is informational, not a recommendation, and Walnut is not an investment adviser.

Solaris Energy Infrastructure (NYSE:SEI), formerly Solaris Oilfield Infrastructure (ticker SOI until September 2024), operates two segments. Solaris Power Solutions leases mobile natural-gas turbine power generation, control, and distribution equipment to data centers, energy operators, and industrial customers, while Solaris Logistics Solutions provides sand-handling and material-management systems used to complete oil and gas wells. The company has pivoted hard toward distributed power as demand from AI and data center buildouts has surged, expanding its power fleet and signing multiple long-term contracts with large technology firms, including one investment-grade customer for more than 600 MW under a 10-year term. The investment picture is a high-growth, high-multiple one. Revenue nearly doubled in 2025 to roughly $622 million and Q1 2026 revenue of about $196 million rose around 55 percent year over year, with power capacity expanding past 3.1 gigawatts and management guiding to further Adjusted EBITDA growth. The market has rewarded this with a valuation well above trailing earnings, so the stock behaves like an AI-infrastructure growth name rather than a traditional oilfield-services company. The offsetting concerns are a rich multiple, a balance sheet that took on roughly $1.3 billion of senior notes to fund fleet expansion, and meaningful concentration in a handful of anchor power customers.

What's the case for buying SEI?

1. AI and data center power demand

SEI's power solutions segment is riding surging electricity demand from AI training and data center buildouts, where behind-the-meter and bridge power is scarce. The company has signed multiple long-term contracts, including a third agreement for more than 600 MW over a 10-year term, and expanded operated fleet capacity past 3.1 gigawatts. This backlog is the core reason the stock re-rated.

2. Fleet expansion and long-term contracts

Management is scaling toward an operated fleet of roughly 3,100 MW by the end of 2029, backed by contracted capacity with technology customers. Long-duration contracts with extension options provide revenue visibility that traditional oilfield equipment leasing lacks. Execution on delivering and commissioning this equipment on schedule is the central driver of forward results.

3. Legacy logistics cash generation

The Solaris Logistics Solutions segment continues to supply sand-handling and material-management systems to oil and gas completions, providing a base of cash flow that partly funds the power buildout. It is now the smaller and slower-growing side of the business, but it anchors the company's roots and relationships in energy end markets.

4. Financing capacity for growth

SEI raised close to $2 billion in 2025 and 2026, including a $1.3 billion 6.375 percent senior notes offering, to fund turbine purchases and fleet growth. Ample liquidity lets the company pursue additional contracts, though it also introduces interest cost and leverage that must be serviced from contracted cash flows.

What are the risks to SEI?

Customer concentration is the dominant risk: as of late 2024 a single large customer accounted for the vast majority of power solutions revenue, so any contract change, delay, or non-renewal could sharply affect results. The valuation is demanding, with the stock trading at a large multiple of trailing earnings, leaving little room for execution stumbles or slowing AI-power demand. Rapid fleet expansion funded by roughly $1.3 billion of debt raises leverage and interest expense, and turbine delivery timelines are subject to supply chain and commissioning delays. The legacy logistics business remains tied to volatile oil and gas activity, and cash generation has historically been sensitive to commodity price swings. Broader risks include competition from larger equipment and power providers and the possibility that hyperscalers build or procure power capacity in-house.

How is SEI valued? (as of MAY 2026)

Price

$64.83

Market cap

$6.06B

P/E (TTM)

77.18

Forward P/E

25.38

Price / book

4.84

Beta

1.18

52-week range

$24.57 to $86.19

Snapshot for SEI as of July 2026, sourced from Yahoo Finance and may be delayed. Valuation figures move with price and earnings; verify the current numbers with your broker before deciding.

Revenue (TTM): ~$690M
Revenue (FY2025): ~$622M
Q1 2026 revenue: ~$196M (up ~55% YoY)
Adjusted EBITDA (TTM): ~$283M
Market cap: ~$6-7B
Net debt / EBITDA: ~1.3x

SEI trades at a rich trailing P/E in the roughly 80 to 95 range, reflecting expectations that its contracted power fleet drives large forward earnings growth. Q1 2026 delivered record revenue near $196 million and Adjusted EBITDA of about $84 million, ahead of consensus, and management raised near-term EBITDA guidance. The company carries roughly $1.3 billion of net debt after refinancing, keeping leverage near 1.3 times EBITDA.

How do you decide if SEI is a buy?

Rather than asking whether SEI is a buy in the abstract, it tends to help to answer four questions:

Thesis: do you believe the case above, and is it still true today?
Time horizon: a single stock can be volatile, so a longer horizon absorbs more of the swings.
Position sizing: a thesis can be right and the sizing still wrong; decide how much of your portfolio one name should be.
Overlap: check whether you already hold SEI indirectly through an index or sector ETF before adding more.

For the full picture, see the SEI stock guide (what the company does, the ETFs that hold it, similar stocks, and the themes it fits). In Walnut you can ask its AI about SEI against your real portfolio and see your actual exposure before deciding.

The bottom line on SEI

The bottom line: Solaris Energy Infrastructure's story right now is AI and data center power demand, with revenue (ttm) at ~$690M. If you believe that narrative continues, the call is about sizing SEI sensibly and checking overlap with what you own; if you doubt it (the risk: customer concentration is the dominant risk: as of late 2024 a single large customer accounted for the vast majority of power solutions revenue, so any contract change, delay, or non-renewal could sharply affect results.), it is not for you. Decide from the thesis, not the ticker. Walnut is not an investment adviser.

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FAQ

Is SEI a good stock to buy right now?

The case for Solaris Energy Infrastructure right now is AI and data center power demand, with revenue (ttm) at ~$690M. If you believe that thesis holds, SEI is a way to own it and the real questions are sizing and overlap, not timing; the main risk to that view is customer concentration is the dominant risk: as of late 2024 a single large customer accounted for the vast majority of power solutions revenue, so any contract change, delay, or non-renewal could sharply affect results. So it comes down to whether you believe the thesis. Walnut is not an investment adviser and this is not a recommendation.

What does Solaris Energy Infrastructure do?

Solaris Energy Infrastructure (NYSE:SEI), formerly Solaris Oilfield Infrastructure (ticker SOI until September 2024), operates two segments.

What are the main risks of SEI?

What does Solaris Energy Infrastructure (SEI) do?

SEI provides mobile, scalable power generation and distribution equipment, primarily natural-gas turbines leased to data centers and industrial customers, alongside a legacy logistics business that supplies sand-handling systems for oil and gas well completions.

Why did the ticker change from SOI to SEI?

The company was renamed from Solaris Oilfield Infrastructure to Solaris Energy Infrastructure to reflect its expansion into distributed power. Its Class A shares stopped trading as SOI and began trading as SEI on the NYSE on September 12, 2024.

How does SEI make money?

SEI earns revenue from two segments: Solaris Power Solutions, which leases power generation and distribution equipment under long-term contracts, and Solaris Logistics Solutions, which provides sand-handling and material-management systems to oilfield completions.

How fast is SEI growing?

Revenue nearly doubled in 2025 to about $622 million, and Q1 2026 revenue of roughly $196 million rose around 55 percent year over year, driven mainly by expansion of the power generation fleet and new data center contracts.

Walnut is informational and is not an investment adviser. This page is educational and not a recommendation to buy or sell SEI; figures are approximate and dated, and your own situation, time horizon, and risk tolerance should drive any decision. Verify current data before investing.