Twelfth Supplemental Indenture, dated as of January 5, 2018, by and between Berkshire Hathaway Energy Company and The Bank of New York Mellon Trust Company, N.A., as trustee, relating to the 2.375% Senior Notes due 2021, the 2.800% Senior Notes due 2023, the 3.250% Senior Notes due 2028 and the 3.800% Senior Notes due 2048

TWELFTH SUPPLEMENTAL INDENTURE, dated as of January 5, 2018 (this “Twelfth Supplemental Indenture”), between BERKSHIRE HATHAWAY ENERGY COMPANY, an Iowa corporation (the “Company”), and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., a national banking association, as Trustee (the “Trustee”) under the Base Indenture referred to below.

WHEREAS, the Company has heretofore executed and delivered that certain Indenture, dated as of October 4, 2002, between the Company and The Bank of New York, as trustee (as amended by Article IV of the Second Supplemental Indenture thereto, dated as of May 16, 2003, between the Company and The Bank of New York, as trustee, Article IV of the Fourth Supplemental Indenture thereto, dated as of March 24, 2006, between the Company and The Bank of New York Trust Company, N.A., as trustee, and Article IV of the Fifth Supplemental Indenture thereto, dated as of May 11, 2007, between the Company and The Bank of New York Trust Company N.A., as trustee, the “Base Indenture,” and, together with this Twelfth Supplemental Indenture, the “Indenture”), to provide for the issuance from time to time of its unsecured debentures, notes or other evidences of indebtedness, the form and terms of which are to be established as set forth in Sections 2.01 and 3.01 of the Base Indenture;

WHEREAS, Section 9.01 of the Base Indenture provides, among other things, that the Company and the Trustee may enter into indentures supplemental to the Base Indenture for, among other things, the purpose of establishing the form and terms of the Securities of any series as permitted in Sections 2.01 and 3.01 of the Base Indenture and of appointing an Authenticating Agent with respect to the Securities of any series;

WHEREAS, the Company desires to create (i) a series of its unsecured notes in an initial aggregate principal amount of four hundred and fifty million dollars ($450,000,000) to be designated the “2.375% Senior Notes due 2021,” (ii) a series of its unsecured notes in an initial aggregate principal amount of four hundred million dollars ($400,000,000) to be designated the “2.800% Senior Notes due 2023,” (iii) a series of its unsecured notes in an initial aggregate principal amount of six hundred million dollars ($600,000,000) to be designated the “3.250% Senior Notes due 2028” and (iv) a series of its unsecured notes in an initial aggregate principal amount of seven hundred and fifty million dollars ($750,000,000) to be designated the “3.800% Senior Notes due 2048” (collectively, the “Securities”), and all action on the part of the Company necessary to authorize the issuance of the Securities under the Base Indenture and this Twelfth Supplemental Indenture has been duly taken; and

WHEREAS, all acts and things necessary (i) to make each series of Securities, when executed by the Company and authenticated and delivered by the Trustee as provided in the Base Indenture, the valid and binding obligations of the Company and (ii) to constitute these presents a valid and binding supplemental indenture and agreement according to its terms, have been done and performed.

NOW, THEREFORE, THIS TWELFTH SUPPLEMENTAL INDENTURE WITNESSETH:

That in consideration of the premises and of the acceptance and purchase of the Securities by the holders thereof and of the acceptance of this trust by the Trustee, the Company covenants and agrees with the Trustee, for the equal benefit of holders of the Securities, as follows:

The use of the terms and expressions herein is in accordance with the definitions, uses and constructions contained in the Base Indenture and the forms of Securities attached hereto as Exhibits A through E. In addition, for all purposes of this Twelfth Supplemental Indenture, except as otherwise expressly provided or unless the context

otherwise expressly requires, the following terms shall have the respective meanings assigned to them as follows and shall be construed as if defined in Article I of the Base Indenture:

“Exchange Security” means a security in global or definitive form substantially in the form set forth in Exhibit E to this Twelfth Supplemental Indenture.

“Global Security” means a Rule 144A Global Security, a Regulation S Temporary Global Security or a Regulation S Permanent Global Security, in global form substantially in the form set forth in Exhibits A, B and C, respectively, to this Twelfth Supplemental Indenture.

“Registration Rights Agreement” means the Registration Rights Agreement, dated January 5, 2018, between the Company and the Representatives.

“Representatives” means Citigroup Global Markets Inc., J.P. Morgan Securities LLC, Mizuho Securities USA LLC, MUFG Securities Americas Inc. and Wells Fargo Securities, LLC, as representatives of the initial purchasers of the Securities.

IN WITNESS WHEREOF, the parties hereto have caused this Twelfth Supplemental Indenture to be duly executed by their respective officers or directors duly authorized thereto, all as of the day and year first above written.

Exhibit A    Form of 144A Global Senior Note

Exhibit B    Form of Regulation S Temporary Global Senior Note

Exhibit C    Form of Regulation S Permanent Global Senior Note

Exhibit D    Form of Restricted Definitive Senior Note

Exhibit E    Form of Private Exchange Senior Note