Derivative Instruments & Hedge Accounting for Energy Transactions

Sara Mazzoccoli is Audit & Assurance Manager, who has served Deloitte’s energy clients for nearly a decade. She is a member of Deloitte’s commodities and energy markets audit and accounting advisory practice, which primarily focuses on derivatives and commodities being traded in the United States, and has extensive experience auditing energy trading companies and the related accounting matters, related to commodity transactions, valuation, and disclosure requirements. Further, Ms. Mazzoccoli has extensive experience serving in an advisory role as part of an internal control SOX remediation team. She worked on multiple acquisitions that required conversion from IFRS to US GAAP standards for reporting purposes, where she focused primarily on the derivative related areas of the company.

Chase Duncan is an Audit & Assurance Manager who has served Deloitte’s financial services clients for  nearly a decade.  He is a member of Deloitte’s commodities and energy markets audit and accounting advisory practice, and primarily focuses on audit and valuation of commodity derivative transactions as well as hedge accounting and disclosure requirements. Chase has extensive experience auditing internal controls over financial reporting for our largest regulated Banking & Capital Markets client and brings perspective on valuation best practices to the PU&R and O&G industries and energy trading markets. He has advised on commodity- and financial-hedge accounting and effectiveness assessments and further has experience serving as a "subject matter expert" over Valuation for audits in other financial services industries.

Nallely De Leon Timmins is Accounting Reporting & Advisory Manager for Commodities and Energy Markets at Deloitte.  She joined the Advisory firm in 2023, after serving five years at EY, most recently as a Senior Consultant.  She earned a B.A. and Masters degree in accounting at the University of Texas, Rio Grande Valley, and is a CPA.

Tawanda Chadenga is a Houston-based Audit & Assurance partner with more than a quarter century experience serving a variety of large, complex public and private companies in the energy industry, primarily power and utilities (both conventional and renewable) and oil and gas companies including energy trading and marketing companies. Mr. Chadenga currently leads Deloitte’s commodities and energy markets audit and assurance business , which provides specialized audit and assurance services to companies with energy trading, marketing, or hedging activities.

David Sackllah is Audit & Assurance Manager, and has served Deloitte’s energy clients for more than a decade.  He is a member of Deloitte’s commodities and energy markets audit and accounting advisory practice, and primarily focuses on auditing both energy trading companies and regulated power and utilities companies, related to commodity transactions (including natural gas and power trading) valuation and contract assessments.  Mr. Sackllah has considerable experience auditing internal controls over financial reporting for SEC. He has provided various accounting advisory services, ranging from contract accounting assessments, internal control assessments and recommendations, and valuation methodology implementation.