EXHIBIT 99.15

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each of the Reporting Persons (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, par value $0.0001 per share, of Infrastructure and Energy Alternatives, Inc., a Delaware corporation, and that this agreement may be included as an exhibit to such joint filing.

IN WITNESS WHEREOF, the undersigned hereby execute this agreement as of October 11, 2022.

ARES SPECIAL SITUATIONS FUND IV, L.P.

By:	ASSF OPERATING MANAGER IV, L.P.
Its:	Manager

	/s/ Chris Kerezsi
	By:	Chris Kerezsi
	Its:	Authorized Signatory

ASSF OPERATING MANAGER IV, L.P.

	/s/ Chris Kerezsi
	By:	Chris Kerezsi
	Its:	Authorized Signatory

ASOF HOLDINGS I, L.P.

By:	ASOF INVESTMENT MANAGEMENT LLC
Its:	Manager

	/s/ Chris Kerezsi
	By:	Chris Kerezsi
	Its:	Authorized Signatory

ASOF INVESTMENT MANAGEMENT LLC

	/s/ Chris Kerezsi
	By:	Chris Kerezsi
	Its:	Authorized Signatory

ARES MANAGEMENT LLC

	/s/ Josh Bloomstein
	By:	Josh Bloomstein
	Its:	Authorized Signatory

ARES MANAGEMENT HOLDINGS L.P.

By:	ARES HOLDCO LLC
Its:	General Partner

	/s/ Josh Bloomstein
	By:	Josh Bloomstein
	Its:	Authorized Signatory

ARES HOLDCO LLC

	/s/ Josh Bloomstein
	By:	Josh Bloomstein
	Its:	Authorized Signatory

ARES MANAGEMENT CORPORATION

	/s/ Josh Bloomstein
	By:	Josh Bloomstein
	Its:	Authorized Signatory

ARES MANAGEMENT GP LLC

	/s/ Josh Bloomstein
	By:	Josh Bloomstein
	Its:	Authorized Signatory

ARES VOTING LLC

By:	ARES PARTNERS HOLDCO LLC
	Its Sole Member

	/s/ Christina Oh
	By:	Christina Oh
	Its:	Authorized Signatory

ARES PARTNERS HOLDCO LLC

	/s/ Christina Oh
	By:	Christina Oh
	Its:	Authorized Signatory

Infrastructure & Energy Alternatives, Inc. SC 13D/A