Billionaire Mario Gabelli’s GAMCO Investors Discloses 5% Stake in Powersecure International, Inc. (POWR)

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Page 17 of 17 SEC Filing
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(f) under the securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with all other Reporting Entities (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the Common Stock of PowerSecure International, Inc. and that this Agreement be included as an Exhibit to such joint filing.  This Agreement may be executed in any number of counterparts all of which taken together shall constitute one and the same instrument.
IN WITNESS WHEREOF, the undersigned hereby execute this Agreement this March 17, 2016.
MARIO J. GABELLI
GGCP, INC.
MJG ASSOCIATES, INC.
GABELLI FOUNDATION, INC.
MJG-IV LIMITED PARTNERSHIP
By:/s/ Douglas R. Jamieson 
     Douglas R. Jamieson
     Attorney-in-Fact
TETON ADVISORS, INC.
By: /s/ David Goldman
       David Goldman
       General Counsel – Teton Advisors, Inc.
ASSOCIATED CAPITAL GROUP, INC.
By:/s/ Kevin Handwerker 
 Kevin Handwerker
General Counsel & Secretary – Associated Capital Group, Inc.
GAMCO ASSET MANAGEMENT INC.
GAMCO INVESTORS, INC.
GABELLI SECURITIES, INC.
G.RESEARCH, INC.
GABELLI FUNDS, LLC
By:/s/ Douglas R. Jamieson
     Douglas R. Jamieson
     President & Chief Operating Officer – GAMCO Investors, Inc.
     President – GAMCO Asset Management Inc.
     Vice President – Gabelli Securities, Inc.
     Secretary – G.research, Inc.
      President & Chief Operating Officer – sole member of
          Gabelli Funds, LLC
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