EXHIBIT 99.1 This statement on Form 4 is filed jointly by each of the undersigned. The principal business address of each of the reporting persons is is 333 South Grand Avenue, 28th Floor, Los Angeles, California 90071. Name of Designated Filer: OAKTREE CAPITAL GROUP, LLC Date of Event Requiring Statement: March 26, 2020 Issuer Name: Infrastructure and Energy Alternatives, Inc. [IEA] OAKTREE CAPITAL GROUP, LLC By: /s/ Henry Orren Name: Henry Orren Title: Vice President OAKTREE CAPITAL GROUP HOLDINGS GP, LLC By: /s/ Henry Orren Name: Henry Orren Title: Vice President OAKTREE CAPITAL MANGEMENT, L.P. By: /s/ Henry Orren Name: Henry Orren Title: Vice President OCM FIE, LLC By: /s/ Henry Orren Name: Henry Orren Title: Authorized Signatory OAKTREE HOLDINGS, INC. By: /s/ Henry Orren Name: Henry Orren Title: Authorized Signatory