- Energy Transition Speakers: How to Read This List
- The 25, In No Particular Order
- Audience Fit at a Glance
- How These 25 Distribute by Credibility Lane
- How to Use This List
- Fee Tiers, Honestly
- Voices We Considered and Held Off On
- Pairing These Voices With the Right Format
- Booking Lead Times and Availability
- The Bottom Line
Energy transition speakers come in five flavors, and most shortlists pick three of them and miss the other two. The strongest programs cast across all five. This is our 2026 list of twenty-five named voices, with a one-line read on who each one is best for.
This is not a popularity contest. It is a working list we maintain across analyst, executive, technologist, policy, and journalist categories. We have placed most of these voices for energy clients in the last twenty-four months, and we run a scoping call before every booking.
Energy Transition Speakers: How to Read This List
For each name, we note the credibility lane (analyst, executive, technologist, policy, or journalist) and the audience fit (operator-heavy, investor-heavy, or balanced). Fee tiers are taken from the framework in our complete energy industry keynote guide.
The 25, In No Particular Order
1. Daniel Yergin. Pulitzer Prize-winning historian, Vice Chairman of S and P Global. Marquee. Best for senior summits where you need a long-arc frame on global energy and the transition.
2. Michael Liebreich. Founder of BloombergNEF, host of Cleaning Up. Senior authority. Best for audiences that want honest economics and a contrarian streak.
3. John Hofmeister. Former President of Shell Oil Company. Senior authority. Best when you want an inside-the-tent voice on majors and the transition.
4. Jigar Shah. Co-founder of SunEdison, former director of the DOE Loan Programs Office. Senior authority. Best for renewables, project finance, and policy audiences.
5. Jennifer Granholm. Former US Secretary of Energy and Governor of Michigan. Marquee. Best for federal policy, IRA implementation, and workforce transition framing.
6. Fatih Birol. Executive Director of the IEA. Marquee. Best for global outlook keynotes and audiences with international scope.
7. Vicki Hollub. CEO of Occidental Petroleum. Marquee. Best when you want a current upstream chief executive on carbon capture and oil and gas in the transition.
8. Bjorn Lomborg. President of the Copenhagen Consensus Center. Senior authority. Best for audiences that want a rigorous policy economist with a contrarian read.
9. Ramez Naam. Author and clean-energy investor, formerly of Microsoft. Senior authority. Best for technologist and investor audiences focused on cost curves.
10. Saul Griffith. Founder of Rewiring America, MacArthur fellow. Senior authority. Best for electrification keynotes and consumer-facing transition framing.
11. Amy Myers Jaffe. Senior research scholar, NYU. Senior authority. Best for energy economics and geopolitics audiences.
12. Joseph Stanislaw. Co-author of The Commanding Heights, founder of JA Stanislaw Group. Senior authority. Best for senior strategy off-sites and capital allocator audiences.
13. Mark Mills. Senior fellow at the Manhattan Institute, partner at Montrose Lane. Senior authority. Best when you want a counterweight voice on transition pacing and physical limits.
14. Varun Sivaram. Former clean-energy lead at Reliance Industries, author of Taming the Sun. Senior authority. Best for technology, policy, and emerging market audiences.
15. Hal Harvey. Founder of Energy Innovation. Senior authority. Best for state-level policy keynotes and utility regulator audiences.
16. Catherine Wolfram. Energy economist, MIT and former Treasury official. Senior authority. Best for transition-economics keynotes and policy-economist programming.
17. Akshat Rathi. Senior reporter at Bloomberg, author of Climate Capitalism. Mid-tier. Best for venue keynotes that want a sharp journalist’s frame on transition capital.
18. Ernest Scheyder. Reuters energy reporter, author of The War Below. Mid-tier. Best for critical minerals and supply-chain audiences.
19. Maria van der Hoeven. Former Executive Director of the IEA. Senior authority. Best for European policy and global utility audiences.
20. Andrew McAfee. Co-founder MIT IDE, author of More from Less. Senior authority. Best for productivity and decoupling framings, balanced rooms.
21. Hannah Ritchie. Head of research, Our World in Data. Mid-tier rising authority. Best for data-driven keynotes and audiences tired of advocacy decks.
22. Vaclav Smil. Author of How the World Really Works. Marquee but selective. Best for senior board off-sites that want long-horizon physical realism.
23. Andrew Winston. Author of Net Positive. Senior authority. Best for corporate sustainability strategy keynotes and CSO audiences.
24. Robbie Orvis. Senior Director, Energy Innovation. Mid-tier. Best for audiences that want a model-driven view of state and federal policy.
25. Holly Jean Buck. Author of After Geoengineering, professor at SUNY Buffalo. Senior authority. Best for climate-policy and transition-justice audiences.
Audience Fit at a Glance
| Best For | Top Picks From the List |
|---|---|
| Operator-heavy utility audience | Hofmeister, Liebreich, Wolfram, Harvey, Orvis |
| Capital allocator audience | Yergin, Stanislaw, Naam, Mills, Jaffe |
| Policy and government audience | Granholm, Birol, van der Hoeven, Buck, Harvey |
| Technology and developer audience | Shah, Sivaram, Griffith, Naam, Ritchie |
| Mixed senior board off-site | Yergin, Smil, McAfee, Winston, Hollub |
How These 25 Distribute by Credibility Lane
How to Use This List
Pick three. Pair them across lanes. The most common mistake is loading three analysts onto one main stage. The most successful programs we have placed in 2026 used one executive (Hofmeister, Hollub, Granholm), one analyst (Liebreich, Yergin, Mills), and one technologist or journalist (Shah, Naam, Rathi).
If your audience leans operator, weight the executive and journalist picks. If it leans investor, weight the analyst and policy picks. If you have a balanced room with utility leadership and capital allocators in equal measure, see our playbook on picking a renewables speaker for a mixed audience.
Fee Tiers, Honestly
The 25 voices on this list span the full fee tier range. Mid-tier (roughly $25,000 to $60,000) is where Rathi, Scheyder, Ritchie, Orvis, and Buck sit. Senior authority ($60,000 to $125,000) is the densest part of the list and includes Liebreich, Hofmeister, Shah, Naam, Griffith, Jaffe, Sivaram, Wolfram, Harvey, Stanislaw, Mills, Winston, McAfee, van der Hoeven, and Lomborg. Marquee ($125,000 to $300,000+) is reserved for Yergin, Granholm, Birol, Hollub, and Smil when he accepts.
Two notes that change the math. First, several of these voices price differently for trade associations vs corporate clients, and most agents will quote within a 15 to 25 percent range depending on travel, prep complexity, and date scarcity. Second, virtual fees are not flat. Marquee voices will sometimes do recorded virtual at 30 to 40 percent of in-person, but rarely live virtual under 50 percent. For a more detailed treatment of how fees move by sub-vertical, see our complete buyer’s guide to energy industry keynote speakers.
Voices We Considered and Held Off On
Every list is also a set of choices not made. Here is a transparent note on a few names you might expect to see and why they are not on this 2026 cut.
We held off on several startup founders who are excellent in their lane but unproven in front of senior policy and capital allocator audiences. We held off on several climate-advocacy voices whose strongest work is on activism, which is the wrong frame for this list. We held off on a few celebrity-adjacent voices (politicians turned podcasters, sustainability authors with no operational depth) whose presence on the program risks softening the room’s read on the rest of the agenda.
We also rotated off a handful of voices whose engagement feedback declined in 2025, often because the deck did not refresh after the IRA implementation cycle moved. The energy transition story is moving fast enough that a stock deck from 2023 sounds dated in a 2026 room. Senior audiences notice.
Pairing These Voices With the Right Format
The format choice often matters more than the named voice. Three formats consistently lift evaluation scores when paired with this list.
Main-stage keynote plus moderated panel. Best for analysts and historians (Yergin, Liebreich, Birol, Mills, Lomborg). The moderator should be a senior journalist or a working operator, not the program chair. Twenty to twenty-five minutes of keynote, fifteen of moderated discussion, ten of audience questions, in that order.
Closed-door briefing. Best for working executives and policy economists (Hofmeister, Granholm, Wolfram, Harvey, Tierney). 30 to 50 senior people in the room, no slides past the first three, Chatham House Rule. The strongest evaluation scores in our 2025-2026 data come from this format.
Fireside chat. Best for technologists and authors (Shah, Naam, Sivaram, Griffith, Ritchie, Buck). Thirty-five minutes of moderated conversation works better than a deck. The moderator selection is the most important variable, more than the speaker.
Booking Lead Times and Availability
The marquee tier on this list (Yergin, Birol, Granholm, Hollub, Smil) typically locks calendars 6 to 12 months out for premium dates and 3 to 6 months for off-peak windows. Senior authority (the bulk of the list) is more flexible at 2 to 4 months. Mid-tier voices can sometimes accept inside 30 days, especially in their core sub-vertical.
Two timing notes. CERAWeek week is a hard block for most of the analyst lane. The week of the IEA World Energy Outlook launch is a hard block for Birol and several IEA-adjacent voices. And election-year calendars (federal and state) tighten availability for Granholm, Wood, and other former officials with active policy commitments.
The Bottom Line
This list is a starting point, not an algorithm. The right voice for your room depends on what your audience is carrying in. Use the audience-fit table to draw a shortlist, then call us. We will check current availability, fee, and the most recent engagement feedback.
Browse the wider TKC energy speakers roster, see the leadership topic hub, or tell us about your event and we will return three to five named options inside two business days.
