Nature of Business and Basis of Presentation Organization During 2016, Charah, Inc. converted from an S corporation to a limited liability company and changed its name to Charah, LLC, a Delaware limited liability company (Charah). In December 2016, Charah became a wholly owned subsidiary of CEP Holdings, Inc. In January 2017, Charah became a wholly-owned subsidiary of Charah Sole Member LLC, which itself is a wholly-owned subsidiary of Charah Management LLC, a Delaware limited liability company (Charah Management). Charah Management was a wholly-owned subsidiary of CEP Holdings, Inc. On January 13, 2017, Charah Management completed a transaction with Bernhard Capital Partners Management, LP ("BCP"), a previously unrelated third party, pursuant to which BCP acquired a 76% equity position of Charah Management ("the BCP transaction"). Allied Power Management, LLC, a Delaware limited liability company (Allied), was formed and became a wholly-owned subsidiary of Allied Power Holdings, LLC, a Delaware limited liability company (Allied Power Holdings), in May 2017. In July 2017, Allied became a wholly-owned subsidiary of Allied Power Sole Member, LLC, which itself is a wholly-owned subsidiary of Allied Power Holdings. Allied Power Holdings has been under common control with Charah Management since April 2017. Charah Solutions, Inc. and subsidiaries (Charah Solutions, the Company, we, us, or our) was formed as a Delaware corporation in January 2018 and did not conduct any material business operations prior to the transactions described below other than certain activities related to its initial public offering, which was completed on June 18, 2018 (the IPO). Charah Solutions is a holding company, the sole material assets of which consist of membership interests in Charah Management and Allied Power Holdings. Through the Companys ownership of Charah Management and Allied Power Holdings, the Company owns the outstanding equity interests in Charah and Allied, the subsidiaries through which Charah Solutions operates its businesses. The historical financial data presented herein as of December 31, 2019 and for periods after June 18, 2018 corporate reorganization is that of Charah and Allied on a consolidated basis, and on a combined basis for periods prior to June 18, 2018 corporate reorganization described below. References to Successor relate to the financial position and results of operations of Charah Solutions on a consolidated and combined basis for the years ended December 31, 2019 and 2018 , Charah and Allied Power Management on a combined basis for the period including and after January 13, 2017, and references to Predecessor relate to the financial position and results of operations of Charah for the period through January 12, 2017. Corporate Reorganization On June 18, 2018, pursuant to the terms of the reorganization transactions completed in connection with the IPO, (i) (a) Charah Holdings LP, a Delaware limited partnership (Charah Holdings) owned by BCP, contributed all of its interests in Charah Management and Allied Power Holdings to the Company in exchange for 17,514,745 shares of common stock, (b) CEP Holdings, Inc., a Delaware corporation owned by Charles E. Price and certain affiliates (CEP Holdings), contributed all of its interests in Charah Management and Allied Power Holdings to the Company in exchange for 4,605,465 shares of common stock, (c) Charah Management Holdings LLC, a Delaware limited liability company (Charah Management Holdings), contributed all of its interests in Charah Management and Allied Power Holdings to the Company in exchange for 907,113 shares of common stock, and (d) Allied Management Holdings, LLC, a Delaware limited liability company (Allied Management Holdings), contributed all of its interests in Charah Management and Allied Power Holdings to the Company in exchange for 409,075 shares of common stock, (ii) each of Charah Management Holdings and Allied Management Holdings distributed the shares of common stock received by them pursuant to clause (i) to their respective members in accordance with the respective terms of their limited liability company agreements and (iii) Charah Holdings distributed a portion of the shares of common stock it received in clause (i) above to certain direct and indirect blocker entities which ultimately merged into the Company, with the Company surviving, and affiliates of BCP received shares of common stock as consideration in the mergers. Description of Business Operations The Company provides mission-critical environmental and maintenance services to the power generation industry, enabling our customers to address challenges related to the remediation of coal ash ponds and landfills at open and closed power plant sites while continuously operating and providing necessary electric power to communities nationwide. Services offered include a suite of coal ash management and recycling, environmental remediation, and outage maintenance services. The Company also designs and implements solutions for complex environmental projects (such as coal ash pond closures) and facilitates coal ash recycling through byproduct sales and other beneficial use services. The Company has corporate offices in Kentucky, North Carolina, and Louisiana, and principally operates in the eastern and mid-central United States. The accompanying consolidated and combined financial statements include the assets, liabilities, stockholders equity, members equity, and results of operations of the Company and its consolidated subsidiaries. Intercompany transactions and balances have been eliminated in consolidation. Under the Jumpstart Our Business Startups Act (the JOBS Act), the Company meets the definition of an emerging growth company, which allows the Company to have an extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act. The Company intends to take advantage of all of the reduced reporting requirements and exemptions, including the longer phase-in periods for the adoption of new or revised financial accounting standards under Section 107 of the JOBS Act until the Company is no longer an emerging growth company. Among other things, we are not required to provide an auditor attestation report on the assessment of the internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act of 2002 and our disclosure obligations regarding executive compensation may be reduced. We may take advantage of these provisions until the last day of our fiscal year following the fifth anniversary of the IPO, or December 31, 2023. However, if certain events occur prior to the end of such five-year period, including if we become a large accelerated filer, our annual gross revenue exceeds $1.07 billion, or we issue more than $1.0 billion of non-convertible debt in any three-year period, we will cease to be an emerging growth company prior to the end of such five-year period. Business Segments The Company operates in two business segments: Environmental Solutions (ES) . The Environmental Solutions segment includes remediation and compliance services, as well as byproduct sales. Remediation and compliance services are associated with our customers need for multi-year environmental improvement and sustainability initiatives, whether driven by regulatory requirements, by power generation customer initiatives, by our proactive engagement or by consumer expectations and standards. Byproduct sales support both our power generation customers desire to recycle their recurring and legacy volumes of coal combustion residuals ("CCRs") commonly known as coal ash and ultimate end customers need for high-quality, cost-effective raw material substitutes. Maintenance and Technical Services (M&amp;TS). The Maintenance and Technical Services segment includes fossil services and nuclear services. Fossil services are the recurring and mission-critical management of coal ash and the routine maintenance, outage services and staffing solutions for coal-fired power generation facilities. Nuclear services, which we market under the Allied Power brand name, include routine maintenance, outage services, facility maintenance, and staffing solutions for nuclear power generation facilities. Unaudited Pro Forma Income Information The unaudited pro forma income information gives effect to the corporate reorganization that occurred in connection with the closing of the IPO and the resulting legal entity of Charah Solutions, which is incorporated as a C Corporation. Prior to the corporate reorganization, the holding companies for Charah and Allied were limited liability companies and generally not subject to income taxes. The pro forma net income, therefore, includes an adjustment for income tax expense as if the holding companies for Charah and Allied had been C Corporations for all periods presented at an assumed combined federal, state and local effective income tax rate of 38% for the year ended December 31, 2017 , and 25% for the periods from January 1, 2018 through June 17, 2018, plus the actual tax expense for the period from June 18, 2018 through December 31, 2018 , excluding the tax related to the corporate reorganization. These rates approximate the calculated statutory tax rate for each period. The tax rate in the preceding sentence for the year ended December 31, 2017 does not reflect the impact of U.S. tax reform, which reduces the federal U.S. statutory tax rate from 35% to 21% , effective in 2018. The tax rates mentioned for the year ended December 31, 2018 reflect the impact of U.S. tax reform.