Which MLPs Have an Investment Grade Rating?

Over the past 10 days, there have been two big acquisition announcements in the master limited partnership space. In both cases, the CEO of the acquiring partnership stressed that the primary motivation for the acquisition was the hope that the new assets would trigger a credit rating upgrade from ratings agencies like Standard & Poor's.

These ratings are a big deal because they have a direct impact on an MLP's cost of capital. With that in mind, today we're looking at which MLPs already have an investment grade rating and what other MLPs need to do to join their ranks.

Label me
First and foremost, Standard & Poor's does not rate every single master limited partnership. Of the 100 or so MLPs that exist today, approximately 56 carry ratings from S&P. Of that group, only 16 are rated investment grade. Remember, S&P defines investment grade as anything rated BBB- or higher.

Here are the 16 MLPs that make the grade:


Credit Rating

Enterprise Products Partners (NYSE: EPD  )


Magellan Midstream Partners


Boardwalk Pipeline Partners (NYSE: BWP  )


Enbridge Energy Partners (NYSE: EEP  )


Kinder Morgan Energy Partners (UNKNOWN: KMP.DL  )


ONEOK Partners


Plains All American Pipeline


Spectra Energy Partners


Williams Partners


Buckeye Partners


DCP Midstream Partners


El Paso Pipeline Partners


Energy Transfer Partners (NYSE: ETP  )


Sunoco Logistics Partners


TC PipeLines


Western Gas Partners


Source: S&P.

Though the S&P rating system goes as high as AAA, no master limited partnership has attained that rating. The business structure of an MLP is inherently more risky than a corporation, which will most likely prevent any from ever attaining the highest rating. In fact, Enterprise Products Partners became the first MLP to reach the BBB+ level just this past February. Magellan Midstream Partners followed shortly thereafter, receiving the same rating in July.

As the above chart suggests, there are a handful of MLPs in line hoping to be the next to qualify for the BBB+ rating. Some will have a much better chance than others, however, despite having the same BBB today. For example, S&P slapped Enbridge Energy Partners with a negative outlook last November, and reaffirmed that negativity this past May. You can get a sense of the agency's logic with this excerpt from its press release:

The negative outlook reflects rating pressure from the partnership's elevated financial measures and tight covenant cushion as it pursues major capital expansions with delayed cash flows, and ongoing expenses associated with its oil spill cleanup.

Enbridge Energy Partners is a bit of a mess right now, and Kinder Morgan Energy Partners or Boardwalk Pipeline Partners are likely better candidates for an upgrade. But why? What exactly drives these ratings?

The system
Standard & Poor's methodology for rating midstream companies is a long and winding road (which you can read about in its entirety here), but there are a few boxes that every MLP must check if it's looking to attain an investment grade rating:

  • Debt: 4.5 times debt to EBITDA is the limit; ideally, it's 4.0 times or lower.
  • Distribution coverage ratio: Keep it above 1.0 times coverage.
  • Revenue: As stable as possible, fee-based revenues are a big winner here, exposure to commodity prices is not.
  • Business Mix: Diversity is king, and that goes for geographical footprint as well as asset make-up. One-trick ponies need not apply.

When you look at this list, you can begin to gauge why an Enbridge Energy Partners may have a negative outlook and why Energy Transfer Partners might see an upgrade coming its way sometime next year. The partnership is much more diverse, both from an operational and geographical standpoint, than it was three years ago. On top of that, it finally (finally!) has its act together financially and is increasing its distribution. Investors can track the above metrics and have a sense of when the ratings tide might turn for Energy Transfer.

Bottom line
It's fair to be skeptical of ratings agencies, given their role in the financial crisis, and by no means should investors confuse a solid rating for a signal to buy. That said, the key factors to a great rating also signify a great business. Additionally, these ratings really do matter because they affect an MLP's cost of capital, and therefore they shouldn't be dismissed entirely.

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Read/Post Comments (6) | Recommend This Article (3)

Comments from our Foolish Readers

Help us keep this a respectfully Foolish area! This is a place for our readers to discuss, debate, and learn more about the Foolish investing topic you read about above. Help us keep it clean and safe. If you believe a comment is abusive or otherwise violates our Fool's Rules, please report it via the Report this Comment Report this Comment icon found on every comment.

  • Report this Comment On October 16, 2013, at 4:12 PM, toomuchgas wrote:

    Why is KMI which holds KMP and EPB is only rated BB?

  • Report this Comment On October 17, 2013, at 9:31 AM, XMFAimeeD wrote:

    It needs to continue to deleverage. Here's what S&P says:

    "Our outlook on KMI's ratings is positive. KMI's ability to complete its deleveraging plan and associated asset dropdowns to KMP and EPB while maintaining consolidated debt/EBITDA in the low 5x area and stand-alone debt/EBITDA of roughly 3x could ultimately lead to a higher rating. The outlook could be stabilized if KMI's consolidated and stand-alone debt/EBITDA are sustained above 5.5x and 4x, respectively. A stable outlook could also

    occur if additional debt-financed acquisitions or a decline in cash flows from its subsidiaries weakens its financial risk profile."

    ETE, which holds the GP for ETP and RGP is in the same boat. BB rating, despite ETP owning BBB-.


  • Report this Comment On October 18, 2013, at 9:24 AM, skywalker wrote:

    an we all know how excellent rating agencies are in making their decicions. See financial crisis, etc.

  • Report this Comment On October 18, 2013, at 9:34 AM, XMFAimeeD wrote:

    ^Yes, addressed in the conclusion.

  • Report this Comment On November 26, 2013, at 12:46 PM, JosephCam82 wrote:

    Do you have the S&P rating on Crestwood Maplewood LP (CMLP)?

  • Report this Comment On November 27, 2013, at 11:08 AM, XMFAimeeD wrote:

    ^Rated BB after closing its Inergy merger.

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