Attached files

file filename
10-K/A - 10-K/A - DYNEGY INC.a2211945z10-ka.htm
EX-32.1 - EX-32.1 - DYNEGY INC.a2211945zex-32_1.htm
EX-32.2 - EX-32.2 - DYNEGY INC.a2211945zex-32_2.htm
EX-31.2 - EX-31.2 - DYNEGY INC.a2211945zex-31_2.htm

QuickLinks -- Click here to rapidly navigate through this document


Exhibit 31.1

SECTION 302 CERTIFICATION

I, Robert C. Flexon, certify that:

1.
I have reviewed this report on Form 10-K/A of Dynegy Inc.;

2.
Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.
Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report.

Date: December 10, 2012   By:   /s/ ROBERT C. FLEXON

Robert C. Flexon
President and Chief Executive Officer



QuickLinks

SECTION 302 CERTIFICATION