Exhibit 24

POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby
constitutes and appoints each of Paula M. Ciprich,
Sarah J. Mugel, Michael W. Reville and James P. Baetzhold,
signing singly, the undersigned's true and lawful
attorney-in-fact to:

(1) prepare, execute in the undersigned's name and on the
undersigned's behalf, and submit to the U.S. Securities and
Exchange Commission (the "SEC") a Form ID, including amendments
thereto, and any other documents necessary or appropriate to
obtain codes and passwords enabling the undersigned to make
electronic filings with the SEC of reports required by
Section 16(a) of the Securities Exchange Act of 1934 or any
rule or regulation of the SEC;

(2) execute for and on behalf of the undersigned, in the
undersigned's capacity as an officer and/or director of National
Fuel Gas Company (the "Company"), Forms 3, 4, and 5 in
accordance with Section 16(a) of the Securities Exchange Act of
1934 and the rules thereunder, Form 144 in accordance with
Rule 144 under the Securities Act of 1933, and any other forms
or reports the undersigned may be required to file in connection
with the undersigned's ownership, acquisition, or disposition of
securities of the Company;

(3) do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete and
execute any such Form 3, 4, 5, or 144, or other form or report,
and timely file such form or report with the SEC and any stock
exchange or similar authority; and

(4) take any other action of any type whatsoever in connection
with the foregoing which, in the opinion of such
attorney-in-fact, may be of benefit to, in the best interest of,
or legally required by, the undersigned, it being understood
that the documents executed by such attorney-in-fact on behalf
of the undersigned pursuant to this Power of Attorney shall be
in such form and shall contain such terms and conditions as such
attorney-in-fact may approve in such attorney-in-fact's
discretion.

The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform any and every act and
thing whatsoever requisite, necessary, or proper to be done in
the exercise of any of the rights and powers herein granted, as
fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution
or revocation, hereby ratifying and confirming all that such
attorney-in fact, or such attorney-in-fact's substitute or
substitutes, shall lawfully do or cause to be done by virtue of
this Power of Attorney and the rights and powers herein granted.

The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of
the undersigned, are not assuming, nor is the Company assuming,
any of the undersigned's responsibilities to comply with the
Securities Act of 1933 or the Securities Exchange Act of 1934,
as amended.

This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4,
and 5 with respect to the undersigned's holdings of and
transactions in securities issued by the Company, unless earlier
revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 14th day of June, 2019.

Signature: /s/ Elena G. Mendel
Name: Elena G. Mendel