Exhibit 4.24

Second Registration Rights Agreement Joinder

April 2, 2015

Each of the undersigned hereby agrees as Guarantor (as defined in the Registration Rights Agreement (as amended, supplemented or joined, the “Registration Rights Agreement”), dated as of October 27, 2014, among Dynegy Inc., a Delaware corporation (as successor in interest to each of Dynegy Finance I, Inc., a Delaware corporation, and Dynegy Finance II, Inc., a Delaware corporation), and the Guarantors party thereto and Morgan Stanley & Co. LLC, Barclays Capital Inc., Credit Suisse Securities (USA) LLC, RBC Capital Markets, LLC and UBS Securities LLC, as representatives of the several Initial Purchasers listed on Schedule I thereto) to be bound by the terms and provisions attributable to a Guarantor of the Registration Rights Agreement and to assume and be bound to perform all obligations of a Guarantor thereunder.  By executing and delivering this Second Registration Rights Agreement Joinder, each of the undersigned hereby becomes a party to the Registration Rights Agreement as a Guarantor thereunder.

[SIGNATURE PAGES FOLLOW]

IN WITNESS WHEREOF, the undersigned has executed this counterpart as of the date first set forth above.