Jeremy Hargreaves

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Jeremy Hargreaves

Dr. Jeremy Hargreaves joined E3 in 2010 and focuses on least-cost system planning under renewable and clean energy policies, as well as distributed energy resource evaluation and policy analysis. He has studied renewable integration and system planning for utilities in California and Hawaii, and is a principal architect of the E3 Renewable Energy Flexibility Model (REFLEX) for long-term system capacity and flexibility planning.

Jeremy has also developed local integrated resource planning models to identify optimal resource portfolios in transmission-constrained areas. One of these tools, the Integrated Demand Side Management Model, which he developed for Con Edison, won the 2014 Utility Analytics Institute Innovation Award. He is particularly interested in the interface between the bulk power and distribution systems and how new and lower-cost demand-side technologies will shape the future electricity grid.

Jeremy is enthusiastic about translating E3’s work in North America to our international consulting practice. He finds it especially satisfying to identify lower-cost clean energy alternatives in countries where low incomes make costly clean energy programs and incentives unfavorable. He recently completed an economic assessment for the U.S. Trade and Development Agency of the cost-effectiveness of energy storage in South Africa, and he is evaluating promising renewable energy projects in sub-Saharan Africa for the USTDA and a South African development bank. He has also studied the cost-effectiveness of distributed resources in Delhi, India. This project included developing a policy implementation pathway for solar rooftop deployment.

Education: PhD and MSE, Johns Hopkins University; MEng, chemical engineering, Imperial College London


Cost-effective pathways to Hawai‘i’s 100 percent RPS goal

n 2015, Hawai‘i passed unprecedented legislation, Act 97, which requires its investor-owned utility, Hawaiian Electric Company (HECO), to meet a 100 percent renewable portfolio standard (RPS) by the end of 2045. Strengthening the state’s economy depends on moving away from imported fossil fuels for both electricity and transportation and increasing reliance on its abundant renewable […]

Modeling California’s 50 Percent Renewables Portfolio Standard

In early 2013, California’s five largest electric utilities needed to find out how grid operations would be affected if the state increased its Renewables Portfolio Standard (RPS) to 50 percent by 2030. They turned to E3 to examine operational and cost implications, explore how the utilities could reach the 50 percent RPS goal, and assess […]

Least-cost planning for achieving Hawai‘i’s 100 percent RPS | HECO, 2015–present

With more than two decades of experience in Hawai‘i, E3 is now helping the Hawaiian Electric Company (HECO) plan for the grid transformation needed to reach 100 percent renewable generation by 2045. Our long-term analysis supported development of the utility’s Power System Improvement Plan (PSIP), with modeling centered on individual island plans and interisland transmission. The study develops least-cost expansion plans for each island using a variety of policy cases and fuel price forecasts. E3 used its Renewable Energy Solutions model (RESOLVE) to explore the economic trade-off between renewable curtailment and investments in storage, and to develop least-cost expansion plans consistent with each scenario. We also solicited and incorporated stakeholder input. HECO filed the PSIP, including testimony and support from E3, with the Hawai‘i Public Service Commission in December 2016.


Investigating a higher RPS for California | LADWP, PG&E, SMUD, SDG&E, and SCE, 2013–14

On behalf of California’s five largest electric utilities, E3 evaluated the challenges, costs, and potential solutions for achieving a 50 percent renewables portfolio standard (RPS) by 2030. Using our Renewable Energy Flexibility Model (REFLEX), we performed detailed operational studies of power system dispatch flexibility constraints under high levels of wind and solar generation. We found that achieving a 50 percent RPS is feasible and that California’s power system can remain reliable as long as renewable resources can be dispatched in response to grid needs. Our study recommended strategies for integrating higher levels of renewables, including greater regional coordination, renewables portfolio diversity, flexible generation capacity, flexible loads, and energy storage. We found that deploying these strategies would reduce the need to curtail renewables, lowering the cost of reaching 50 percent RPS.


Assessing benefits and challenges of the Western EIM

he grid in the western U.S. is a patchwork of 38 balancing authorities. Each balances its loads and resources independently, exchanging energy through bilateral trades. This inefficient system is being strained with the growing presence of variable resources such as wind and solar. In 2011, the Western Electric Coordinating Council (WECC) engaged E3 to quantify […]

Distributed resources planning tool development | Con Edison, 2014

E3 built on a collaboration with Con Edison going back to 2000 to develop an integrated demand-side management (IDSM) model that expands the utility’s distribution planning capabilities. Using detailed data on customer populations, the tool assesses market potential for dispatchable distributed energy resources (DERs) within local electric networks, enabling Con Edison to identify lower-cost ways to alleviate local distribution constraints.

Con Edison has integrated the IDSM tool into its distribution planning practices and is using it to help realize the New York State Public Service Commission’s Reforming the Energy Vision initiative. The E3 team continues to refine and enhance the tool, which won the 2014 Utility Analytics Institute Innovation Award.


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