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Diego Hernandez Diaz


Advises utilities and industrial companies on harnessing the power of digitization and advanced analytics to navigate the energy transition, improve performance, and reduce costs

Diego is a partner who works with Energy Solutions, a specialized McKinsey unit focused on harnessing digital and advanced analytics to enable the energy transition. He leads development of solutions, as well as their delivery to clients. Diego also leads McKinsey’s work on green power and heat procurement globally, supporting small and large industrial and consumers on the value capture. He co-leads McKinsey’s work in green energy transformation, supporting energy consumers in their decarbonization journey.

Diego has worked extensively with energy consumers, utilities and OEMs on challenges in operations, maintenance, and strategy across Europe, the Americas and Asia.

Examples of his recent client projects include the following:

  • Led the study and analysis of digital use cases enabling flexibility in the grid, as required by the European RES targets and plans culminating in the publication of a co-authored report
  • Developed an advanced analytics model to understand the pathway for industrial offtakers to optimize their green energy procurement considering a vast array of potential instrument including RES, storage, PPAs, GO’s to better define the LCOE and cost of decarbonization
  • Drove the analysis of the Swiss power market to support clients to better understand the potential stress point in the Swiss National Energy Strategy
  • Led the total value and digital assessment for a leading utility across production, identifying €20-40 million in total opportunity across CAPEX / OPEX; also,establishing a broad go-forward strategy aligned with the internal transformation and broader market trends, helping a utility to develop and implement a customized technology solution for managing asset performance across a portfolio of more than 30 solar construction projects

Before joining McKinsey, Diego spent four years with an international banking group as an equity research associate. He speaks five languages.

Published work

Playing offense: Industrials staying ahead in the energy transition,” McKinsey & Company, April 2024

A balancing act: Securing European gas and power markets,” McKinsey & Company, April 2023

Decarbonizing the grid with 24/7 clean power purchase agreements,” McKinsey & Company, May 2022

Digitalization of energy flexibility,” Publications Office of the European Union, March 2022

Finding the right (of) way to efficient road operation and maintenance,” McKinsey & Company, July 2021

The new imperative for grid operators,” McKinsey & Company, September 2020

4 myths about manufacturing in the Fourth Industrial Revolution,” European Sting and World Economic Forum, February 2019

Past experience

Credit Suisse
Equity research associate


The Wharton School, University of Pennsylvania
MBA, business administration and operations
BS, finance and management

University of Pennsylvania
MA, international studies

University of Pennsylvania School of Engineering and Applied Science
BS, computer science