⁠Calgary’s AltaGas Raises US$750 Million Through U.S. Unit in New Cross-Border Debt Deal

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Calgary-based AltaGas is tapping the U.S. debt market for US$750 million in a transaction that highlights just how cross-border the Canadian energy infrastructure company has become. AltaGas Services (U.S.) Inc., a wholly owned subsidiary, has priced US$750 million of 5.75% senior notes due in 2031, with the parent company fully guaranteeing the debt.

The financing arrives as AltaGas balances a substantial capital program, regulated U.S. utility investments and expanding Canadian midstream infrastructure. The company says proceeds could be directed toward existing credit-facility borrowings, outstanding medium-term notes and other corporate purposes. Although the headline number is large, the transaction should not automatically be viewed as US$750 million of entirely new leverage. Much will depend on how much existing debt AltaGas ultimately repays once the offering closes.

The US$750 Million Deal Is a Senior Unsecured Offering

AltaGas announced on September 21 that its U.S. subsidiary had priced US$750 million in aggregate principal amount of senior notes carrying a 5.75% coupon and maturing in 2031. The securities will be unsecured, meaning investors are not being given a specific pipeline, utility network or other physical asset as collateral. Instead, the notes rank equally with AltaGas’s other senior unsecured obligations. AltaGas itself is also providing a full and unconditional guarantee, an important feature because the actual issuer is AltaGas Services (U.S.) Inc.

At face value, the coupon implies annual interest payments of roughly US$43.1 million on US$750 million of principal while the notes remain outstanding. That figure puts the size of the financing into more practical terms. The deal is expected to close on October 1, subject to customary conditions, so AltaGas has priced the financing but had not yet completed the transaction when it announced the terms. That distinction matters when describing the company’s current debt position.

Much of the Money Could Simply Replace Existing Debt

AltaGas has given itself considerable flexibility over what happens to the proceeds. The company specifically identified repayment of borrowings under its credit facility as one possible use. It may also redeem or repurchase some outstanding medium-term notes, either in whole or in part. General corporate purposes are included as well. As a result, the US$750 million headline does not necessarily mean AltaGas intends to permanently increase its debt load by the same amount.

Consider what happens when a company issues US$750 million of bonds and then uses most of that cash to repay shorter-term bank borrowings or another bond maturity. The composition and maturity of its debt change, but the net increase in indebtedness can be much smaller than the size of the bond issue suggests. AltaGas has used similar refinancing tools before. In November 2025, for example, it issued C$500 million of senior unsecured medium-term notes and said proceeds would help repay existing indebtedness. The newest deal therefore fits within a broader pattern of actively managing funding sources rather than simply accumulating new borrowing.

A 5.75% Coupon Reflects a Much More Expensive Rate Environment

The 5.75% coupon also needs to be viewed against current U.S. borrowing conditions. On September 21, the Federal Reserve’s Treasury-market data put the five-year U.S. Treasury constant-maturity yield at approximately 4.83%. A simple comparison puts AltaGas’s 5.75% coupon about 0.92 percentage points, or 92 basis points, above that Treasury benchmark. That should not be treated as the precise credit spread on the issue because AltaGas’s announcement did not disclose the final issue yield and price, but it provides useful market context.

The bigger point is that corporations are raising money in a fundamentally different rate environment from the ultra-low-rate period several years ago. AltaGas itself reported second-quarter interest expense of C$117 million in 2026, compared with C$114 million a year earlier. Management attributed the increase partly to higher average interest rates and additional hybrid notes. For an infrastructure company with billions of dollars in long-lived assets, even modest changes in financing costs can become meaningful, making maturity management and the timing of refinancings increasingly important.

Using a U.S. Subsidiary Fits AltaGas’s Cross-Border Business

The Calgary headquarters can make AltaGas appear primarily Canadian at first glance, but a significant part of its business sits south of the border. Its regulated utility operations include Washington Gas and SEMCO Energy, which collectively serve around 1.6 million customers. Washington Gas operates across Virginia, Maryland and the District of Columbia, while SEMCO serves Michigan. AltaGas reported an average U.S. utility rate base of approximately US$5.5 billion for 2025.

That footprint helps explain why a financing through AltaGas Services (U.S.) Inc. is not an unusual departure from the company’s underlying business. AltaGas earns substantial amounts from U.S.-based infrastructure while simultaneously operating a major Canadian midstream platform that processes, transports and exports energy products. The latest financing effectively mirrors that geographic mix: a Canadian-headquartered parent is using a wholly owned American entity to access U.S.-dollar debt markets. The parent guarantee also links the financing back to the wider AltaGas enterprise instead of leaving investors dependent solely on the subsidiary’s standalone position.

AltaGas Is Spending Heavily While Major Projects Advance

The debt transaction also arrives during a capital-intensive period. After its second-quarter results, AltaGas increased its expected 2026 capital program from roughly C$1.7 billion to C$1.8 billion, excluding asset-retirement obligations. Approximately 61% was expected to go toward Utilities and around 36% toward Midstream, with the remainder allocated elsewhere in the company. That is a considerable annual investment program even for an infrastructure business of AltaGas’s scale.

One major project behind the higher spending is the Ridley Island Energy Export Facility, or REEF, in British Columbia. AltaGas said in July that the development was approximately 85% complete and revised the project’s estimated capital cost to about C$1.5 billion after higher maritime construction expenses. Commercial operations were expected before the end of the first quarter of 2027. AltaGas has also committed capital to Northeast British Columbia growth projects and ongoing U.S. utility modernization. With several initiatives competing for funding at once, maintaining access to multiple debt markets gives the company another layer of financial flexibility.

The Balance Sheet Was Stronger Heading Into the Financing

AltaGas entered the second half of 2026 with improving leverage metrics despite carrying substantial absolute debt. At June 30, the company reported C$10.04 billion of net debt and C$8.883 billion of adjusted net debt. Its adjusted net debt-to-normalized EBITDA ratio stood at 4.4 times on a trailing basis, down from 4.7 times at the end of 2025. AltaGas’s calculation gives 50% debt treatment to its subordinated hybrid securities and preferred shares, so the adjusted measure is not identical to conventional net debt.

That 4.4-times figure was below the bottom of AltaGas’s stated 4.5-to-5.0-times target range at the end of the quarter. Earlier guidance had emphasized maintaining an investment-grade balance sheet, with Fitch having affirmed a BBB rating and S&P having affirmed BBB- when AltaGas issued its 2026 outlook. Those metrics provide important context for the new US$750 million offering. The key issue is not simply whether gross borrowings rise temporarily when the notes settle, but where leverage ends up after the proceeds are deployed and existing obligations are repaid or retired.

October 1 Is the Next Important Date

Investors watching the transaction now have a straightforward milestone: expected closing on October 1, 2026. The offering remains subject to customary closing conditions. AltaGas also said the securities have not been registered for sale under the U.S. Securities Act of 1933. Instead, the notes are being offered to qualified institutional buyers under Rule 144A and through offshore transactions complying with Regulation S. In Canada, the offering is relying on exemptions from prospectus requirements rather than a conventional public prospectus-qualified sale.

Once the transaction closes, attention should move from the financing announcement to the actual deployment of the proceeds. The most important question will be how much goes toward credit-facility repayment, how much is used to retire outstanding medium-term notes and whether any meaningful amount remains for broader corporate purposes. That allocation will reveal whether the deal primarily extends maturities and reshapes AltaGas’s debt stack or results in a material increase in net borrowing. For a company simultaneously investing in U.S. utilities and Canadian export infrastructure, that difference will matter more than the US$750 million headline alone.

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