Energy Storage (ESS) Contracts & Service Agreements

Shivam Chauhan is a Consultant in Emerging Technologies at Customized Energy Solutions.  He joined CES in 2019 with focus on IESA activities and consulting services related to the area of energy storage and conversion technologies for various applications such as automotive, stationary power, portable power and grid scale storage.  Mr. Chauhan has in depth understanding of various energy storage technologies, electric mobility and renewable energy. Prior to joining CES, he has also worked on projects for National Institute of Solar Energy (N.I.S.E.)-India and the Indian Army.  Mr. Chauhan holds a Master of Technology in Renewable Energy Engineering and Management from The Energy and Resource Institute (TERI) University, Delhi, India as well as a Bachelor of Technology degree in Electrical and Electronics Engineering from G.L. Bajaj, Greater Noida, India.

Madeline Frierson is Lead Consultant of Emerging Technologies at Customized Energy Solutions.  She joined CES in 2024. Prior to joining the firm, she worked at Malta, a Long Duration Energy Storage technology company where she supported the commercialization of the OEM’s thermal energy storage product by analyzing and developing the US LDES market. Before her service at Malta, Ms. Frierson started her career with General Electric in roles in both the company’s Gas Turbine and Grid Connections service lines. At GE, she managed the commercial operations process for a number of key customers located across the United States for a wide variety of product offerings and was a graduate of the Commercial Leadership program, a two-year program focused on servicing the US energy markets.  Ms. Frierson holds a B.S of Chemical Engineering from Villanova University.

Devin Gaby is Associate Director of Emerging Technologies at Customized Energy Solutions (CES).  He joined the firm in 2024. He is a clean energy valuation expert with extensive experience supporting developers, utilities, co-ops, CCAs, and utility commissions identify the right solutions for their system.  Prior to CES, Mr. Gaby worked at Strategen Consulting, where he led quantitative analyses for renewables and energy storage serving as an expert witness in IRP proceedings. He also led the development of clean energy replacement strategies for fossil fuel generation in utilities across the country. Before his service at Strategen, he managed several software services for Ascend Analytics, including the implementation of gross margin at risk models for portfolios with market price exposure to guide hedging and risk mitigation strategies in CAISO, ERCOT, NYISO, PJM, and other regions.  Mr. Gaby earned a M.S. of Civil and Environmental Engineering with a focus on Energy, Civil Infrastructure and Climate from UC Berkeley and a B.S. of Physics and Mathematics from Dickinson College in Carlisle, Pennsylvania.

Kasturi Pattalwar is an Analyst in Financial Services at Customized Energy Solutions (CES).  She joined the firm in 2015.  In her role, she has been involved in financial modelling, analysis and consulting for various projects in India and USA. Her work focuses on comprehensive analysis of energy storage market providing investment analysis and pricing forecasts based on respective market regulations.  Prior to CES, she worked with Reliance Energy Ltd., in electricity distribution business of Mumbai as Assistant Manager for engineering and procurement services. Her experience includes network expansion planning, equipment specification designing, vendor management as well as technical evaluation of bids.  Ms. Pattalwar earned a Masters of Business Administration in Finance from Welingkar Institute of Management, Mumbai, India; Bachelor of Electrical Engineering from College of Engineering Pune, India.

Rochelle Rabeler is a partner at the law firm Holland & Hart.  She counsels developers, investors, sponsors, and independent power producers in connection with wind, solar, storage, and other energy projects throughout the U.S., varying in size from 100 kW to 1000+ MW. Ms. Rabeler works with both buyers and sellers, guiding them through each nuance of project development contracts, mergers and acquisitions, and debt and equity financing, including ISDA and other hedge and swap agreements. She specializes in power purchase agreements (PPAs) and has extensive experience representing parties in the negotiation of traditional physical off-take PPAs and also financial and virtual PPAs or contracts for differences. To date, Ms. Rabeler has supported clients successfully negotiate and execute corporate PPAs for wind and solar projects totaling more than 2 GW in the aggregate.

Ashley Wald is a Partner in the law firm Holland & Hart LLP.  She provides guidance to clients in the solar, wind, hydropower and natural gas industries as they develop energy projects and related infrastructure across the United States.  She negotiates power purchase agreements on behalf of clients seeking to buy renewable power, including municipal utilities and electric cooperatives, and she is uniquely positioned to provide insights and strategic solutions based on her experience sitting on both sides of the negotiating table.  In addition, Ms. Wald counsels clients in the purchase and sale of energy project assets and project companies.

Brian Warshay is a Principal of the Energy Storage Engineering section and Team Lead for Energy Storage Independent Engineering at DNV.  He has more than a decade of experience researching and evaluating and developing large-scale behind-the-meter and front-of-meter energy storage and electric vehicle projects that incorporate wholesale energy market revenues.  Mr. Warshay has worked with utilities and retailers to develop VPPs and procure energy storage and electric vehicles for a variety of grid services. At DNV, he supports project work that incorporates project and product financial and contractual analysis and retail rate policy assessment. He also works with clients developing strategies to incorporate energy storage and electric vehicles into their portfolios and those entering new markets with storage products.   Mr. Warshay’s team has led or supported the due diligence of some 1.5 GWh of standalone and hybrid energy storage projects in North America totaling in excess of $1bn in equity and debt financing transactions.

Ann Yu is Vice President of Emerging Technologies at Customized Energy Solutions (CES).  She assists clients with evaluating the costs and benefits of emerging technologies under different market structures.  Ms. Yu has extensive experience in modeling the technical and economic aspects of energy storage and other emerging technologies. Her work includes developing use cases and value proposition of integrating energy storage with renewable energy projects and evaluating the technical capabilities of various types of energy storage technologies in both structured markets and isolated electric grids. Prior to joining CES, Ms. Yu helped a leading energy storage manufacturer evaluate new market opportunities and manage operating projects. She holds an MS in Civil Environmental Engineering from Carnegie Mellon University and a Bachelor’s degree in Physics from National Taiwan University, Taipei, Taiwan.