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Ms. Mariko Geronimo Aydin, a Senior Associate in The Brattle Group’s San Francisco office, has thirteen years of experience in analyzing the policies and economics of electricity system planning, regulation, and de-regulation of electricity supply, and wholesale electricity markets across the U.S.

Her more recent work has focused on finding sustainable and creative ways to adapt traditional planning processes and analytical tools to an industry rapidly shifting towards cleaner and more scalable supply technologies. Today’s electricity industry still has untapped potential to meet goals of clean energy, cost-effectiveness, and operational and planning flexibility through greater electricity customer engagement, cutting-edge data analysis, and new technologies. To reach this potential with a robust and modern grid, Mariko works with clients to explore options for evolving utility business models, customer choice, and wholesale market refinements that can make the best use of distributed and customer-driven power supply resources, in synergy with more traditional resources.

Mariko holds a B.S. in Economics and an M.A. in Applied Economics from Northeastern University in Boston, Massachusetts.

Rate Design for the Digital Age
June 28, 2019
Presented at CRRI - Rutgers University 32nd Annual Western Conference by Mariko Geronimo Aydin
Reinventing Demand Response
June 27, 2019
Presented at CRRI - Rutgers University 32nd Annual Western Conference by Mariko Geronimo Aydin
Expanding Customer Choices in a Renewable Energy Future
May 2019
Published in "Leadership and Rate Design" - A Supplement to the APPA Public Power Magazine
Customer Driven Rate Design
April 9, 2019
Presented at California Municipal Rates Group Annual Meeting
California Megafires: Approaches for Risk Compensation and Financial Resiliency Against Extreme Events
October 1, 2018
Prepared for Pacific Gas and Electric Company
Rate Design to Enable Flexible Loads
September 18, 2018
Presented at APPA Business & Financial Conference 2018
Shortage Pricing in North American Wholesale Electricity Markets
January 26, 2018
Judy Chang, Mariko Geronimo Aydin, Romkaew P. Broehm, Yingxia Yang, and Richard Sweet
Prepared for the Alberta Electric System Operator
Market Power Screens and Mitigation Options for AESO Energy and Ancillary Service Markets
January 26, 2018
Romkaew P. Broehm, Judy Chang, Johannes P. Pfeifenberger, Mariko Geronimo Aydin, Connor Haley, and Richard Sweet
Prepared for the Alberta Electric System Operator (AESO)
Modeling the 1-Step and 2-Step Dispatch Approaches to Account for GHG Emissions from EIM Transfers to Serve CAISO Load
November 17, 2017
Prepared for the California ISO
Re-evaluating the Implied Cost of CO2 Avoided by Clean Energy Investments
October 2017
Published in The Electricity Journal, Volume 30, Issue 8, Pages 17-22
Moving Forward with Electricity Tariff Reform
September 2017
Published in the CATO Institute's Fall 2017 Regulation Magazine
Advancing Past “Baseload” to a Flexible Grid: How Grid Planners and Power Markets Are Better Defining System Needs to Achieve a Cost-Effective and Reliable Supply Mix
July 28, 2017
Presented to the Senate Energy & Natural Resources Committee
Advancing Past "Baseload" to a Flexible Grid: How Grid Planners and Power Markets Are Better Defining System Needs to Achieve a Cost-Effective and Reliable Supply Mix
June 26, 2017
Prepared for the Natural Resources Defense Council (NRDC)

The report examines why traditional “baseload” power plants, such as coal and nuclear, are becoming less economical, why their ability to produce power continuously is less essential in today’s supply mix, and why operational flexibility is an increasingly important ingredient for a cost-effective supply of electricity.

Reforming Ontario’s Wholesale Electricity Market: The Costs and Benefits
June 2017
Published in Energy Regulation Quarterly, Volume 5, Issue 2
This article provides a review of a recent report authored by Brattle economists examining the net benefit that Ontario could realize through implementation of a locational energy market, improving the system’s operating flexibility, and the introduction of an incremental capacity auction for maintaining resource adequacy.
The Future of Ontario's Electricity Market: A Benefits Case Assessment of the Market Renewal Project
April 20, 2017
Johannes P. Pfeifenberger, Kathleen Spees, Judy Chang, Mariko Geronimo Aydin, Walter Graf, Peter Cahill, James Mashal, and John Imon Pedtke
Prepared for IESO
Senate Bill 350 Study: The Impacts of a Regional ISO-Operated Power Market on California
July 12, 2016
Judy Chang, Johannes P. Pfeifenberger, Mariko Geronimo Aydin, Onur Aydin, Kai Van Horn, David Luke Oates, Lauren Regan, Peter Cahill, and Colin McIntyre
Prepared for the California Independent System Operator. Co-authored by members of The California Independent System Operator, Energy and Environmental Economics, Inc., Berkeley Economic Advising and Research, LLC, and Aspen Environmental Group.
Electric Utility Integrated Resource Plan (IRP): Demand-Side Resources
July 16, 2014
Romkaew P. Broehm and Mariko Geronimo Aydin
Presented to the Thai Energy Regulatory Commission, OERC, and Utilities Delegation, Boston, MA
Contrasting Competitively-Bid Transmission Investments in the U.S. and Abroad
May 13, 2014
Presented at a UBS Conference Call
Competition in Transmission Planning and Development: Current Status and International Experience
January 31, 2014
Prepared for the EUCI's Tranmission Policy: A National Summit
What Price, GHGs?
October 2012
Published in Public Utilities Fortnightly
Centralized Dry Storage of Nuclear Fuel: Lessons for U.S. Policy from Industry Experience and Fukushima
August 2012
Frank C. Graves, Mariko Geronimo Aydin, and Glen A. Graves
Published by The Brattle Group, Inc.
2010 Integrated Resource Plan for Connecticut
January 2010
Published by The Brattle Group, Inc.
2009 Integrated Resource Plan for Connecticut
January 2009
Onur Aydin, Judy Chang, Mariko Geronimo Aydin, Marc Chupka, and Joseph B. Wharton
Published by The Brattle Group, Inc.
Promoting Use of Plug-In Electric Vehicles through Utility Industry Acquisition and Leasing of Batteries, chapter 13 of Plug-In Electric Vehicles: What Role for Washington?
In Plug-In Electric Vehicles: What Role for Washington?, published by The Brookings Institution
Review of PJM's Reliability Pricing Model (RPM)
June 30, 2008
Prepared for PJM Interconnection, L.L.C.
News & Events
May 31, 2019
Brattle Economists Discuss the Importance of Customer Flexibility in a Future of Renewable Energy

Brattle Principal Ahmad Faruqui and Senior Associate Mariko Geronimo Aydin have co-authored an article published in the American Public Power Association’s “Leadership in Rate Design” supplement to the May/June issue of the Public Power Magazine.

September 16, 2018
Mariko Geronimo Aydin to Present at APPA Annual Business & Financial Conference

Brattle Senior Associate Mariko Geronimo Aydin will speak at the American Public Power Association (APPA) Annual Business & Financial Conference, to be held September 16-19 in Anaheim, CA.

June 26, 2017
Brattle Economists Recommend Moving beyond "Baseload" Generation for Planning and Operating Today's Electric Grid

Brattle economists have released a report explaining how the use of the term “baseload” generation is no longer useful for the purposes of planning and operating today’s electricity system.

June 20, 2017
Brattle Economists Contribute Two Articles to Energy Regulation Quarterly

Brattle economists have contributed two articles to the current issue of Energy Regulation Quarterly, a journal that provides a forum for debate and discussion on issues surrounding the regulated energy industries in Canada.

April 26, 2017
Ontario Market Renewal Effort Could Provide Up to CAD $5.2 Billion in Customer and Supplier Benefits, According to Brattle Economists

Brattle economists have authored a report that concludes the Independent Electricity System Operator’s (IESO) proposed Market Renewal efforts to reform the province’s wholesale electricity markets could provide significant benefits to customers and suppliers in Ontario.

July 12, 2016
Study Co-Authored by Brattle Economists Examines Impacts of a Regional Power Market in the Western U.S. for California ISO

Brattle economists have co-authored a new study that provides a comprehensive examination of the impacts of transforming the California Independent System Operator into a multistate, regional ISO.

August 15, 2014
Brattle Studies Cited by Appeals Court in Decision to Uphold Federal Energy Regulatory Commission Order 1000

The Court of Appeals cited Brattle studies in its recent decision to uphold the FERC Order 1000, compelling states to coordinate on transmission planning to meet cost obligations for new electricity transmission capacity.

July 16, 2014
Brattle Consultants Lead Demand Response Workshop Before Thai Energy Regulatory Commission and Utilities Delegation

Brattle consultants presented a half-day workshop on the growth of demand response technology in the electric utility industry before the Energy Regulatory Commission of Thailand, along with other representatives on July 16, 2014 at EnerNOC’s Boston headquarters.