| 1. | Section 1.1 of      the Agreement is hereby amended by deleting the definition of the term      “Designated Cash” therein and replacing it in its entirety with the      following: |
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| 2. | Exhibit A      attached to the Agreement is hereby amended by deleting the definition of      the term “Designated Cash Amount” therein and replacing it in its entirety      with the following: |
|----|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| 3. | Except      as herein amended, all other terms and provisions of the Agreement shall      remain in full force and effect, and the Parties ratify and confirm the      Agreement as amended hereby. |
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| 4. | The      Agreement, as amended by this Amendment, constitutes the entire agreement      among the Parties and supersedes any prior understandings, agreements, or      representations by or among the Parties, written or oral, to the extent      they relate in any way to the subject matter  hereof. |
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| 5. | This      Amendment and any claims with respect to the legal relations between the      Parties shall be governed by and construed in accordance with the laws of      the State of Delaware, excluding any choice of law rules which may direct      application of the laws of anotherjurisdiction. |
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| 6. | This      Amendment may be executed in one or more counterparts (including by means      of facsimile), each of which shall be deemed an original but all of which      together will constitute one and the same  instrument. |
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| MACQUARIE      INFRASTRUCTURECOMPANY      INC.        |                                                 |
|-------------------------------------------------------|------------------------------------------------------|
|                                                  |                                                 |   |
| By:                                                   | /s/      James Hooke                                 |   |
|                                                  | Name:      James Hooke                               |   |
|                                                  | Title:   Chief      Executive Officer |   |
|                                                  |                                                 |   |
| By:                                                   | /s/      Todd Weintraub                              |   |
|                                                  | Name:      Todd Weintraub                            |   |
|                                                  | Title:   Chief      Financial Officer |   |
|                                                  |                                                 |   |
| MACQUARIE      DISTRICT ENERGYHOLDINGS      III LLC   |                                                 |
|                                                  |                                                 |   |
| By:      Macquarie Infrastructure Company Inc.,       |                                                 |
|   its      Managing Member                  |                                                 |
|                                                  |                                                 |   |
| By:                                                   | /s/      James Hooke                                 |   |
|                                                  | Name:      James Hooke                               |   |
|                                                  | Title:   Chief      Executive Officer |   |
|                                                  |                                                 |   |
| By:                                                   | /s/      Todd Weintraub                              |   |
|                                                  | Name:      Todd Weintraub                            |   |
|                                                  | Title:   Chief      Financial Officer |   |
|                                                  |                                                 |   |
| JOHN      HANCOCK LIFE INSURANCECOMPANY               |                                                 |
|                                                  |                                                 |   |
| By:                                                   | /s/      Gerald C. Hanrahan, Jr.                     |   |
|                                                  | Name:      Gerald C. Hanrahan, Jr.                   |   |
|                                                  | Title:   Managing      Director       |   |
|                                                  |                                                 |   |
| JOHN      HANCOCK LIFE INSURANCECOMPANY      (U.S.A.) |                                                 |
|                                                  |                                                 |   |
| By:                                                   | /s/      Gerald C. Hanrahan, Jr.                     |   |
|                                                  | Name:      Gerald C. Hanrahan, Jr.                   |   |
|                                                  | Title:   Authorized      Signatory    |   |

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