Clean Energy Standard Act of 2019 This bill addresses clean energy standards. Among other things, the bill requires retail electricity suppliers to sell a certain quantity of clean electric energy; establishes a federal clean energy credit trading program; subjects retail electricity suppliers to civil penalties for noncompliance with requirements; establishes a state energy efficiency, clean energy deployment, and electric bill reduction program; requires the Department of Energy (DOE) to facilitate coordination between the federal clean energy program and state clean and renewable energy programs; requires the National Academy of Sciences to periodically evaluate all aspects of the federal clean energy standard; and directs DOE to establish a program for the research, development, demonstration, and deployment of clean energy technologies and portfolios.