Most publicly traded corporations are required to submit quarterly (10-Q) and annual (10-K) reports to the SEC detailing the financial operations of the company over the past quarter or year, respectively. These corporate filings are available on the SEC website at www.sec.gov

Go to the SEC website, follow the Search for Company Filings link, and search for SEC filings made by Tesla Motors (TSLA). Find the most recent 10-Q or 10-K and download the form. Look on the balance sheet to find the book value of debt and the book value of equity.