May Investor Newsletter: Heating Up

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Friends of Greentown,

I’m still catching my breath from the whirlwind of conferences over the past month—from the MIT Energy Conference, to the EarthX E-Capital Summit, and then NREL’s Industry Growth Forum, I haven’t spent much time at my desk, but it has been amazing to see old friends in the network, meet some of you in person for the first time, and get to know so many new faces and firms who are getting this newsletter for the first time! Though my travel schedule may be cooling down, things are heating up as we approach the summer, and we have no shortage of opportunities for you to connect with our startups in May and June. Here are some events you won’t want to miss:

  • May 19: Greentown Labs + The Ion Activation Festival (Greentown Houston) 
    • Innovators from across Houston’s Innovation District will come together to celebrate the milestones of the ecosystem over the past two years, the future of energy transition in Houston, and what startups need from industry leaders to keep the momentum going.
  • May 24: Carbon to Value Initiative Year 3 Kickoff (Greentown Boston)
    • Celebrate the kickoff of Year 3 of the Carbon to Value (C2V) Initiative, a multi-year collaboration among the Urban Future Lab at NYU Tandon School of Engineering, Greentown, Fraunhofer USA, and NYSERDA. At this event, attendees will hear from industry experts as well as pitches from this year’s carbontech startup finalists.
  • June 8: EnergyBar: Go Energize 2023 Kickoff (Greentown Boston)
    • At this EnergyBar, attendees will hear lightning pitches from finalists building environmental and digital solutions for responsible development in offshore wind industry and celebrate the kickoff of Go Energize 2023, a Greentown Go startup-corporate partnerships accelerator program in partnership with Vineyard Wind and the Massachusetts Clean Energy Center. 
  • June 28: Transition on Tap (Greentown Houston)
    • Transition On Tap is Greentown Labs’ monthly networking event devoted to fostering conversations and connections among the climate and energy transition ecosystem in Houston and beyond. Entrepreneurs, investors, students, and friends of climatetech are invited to attend, meet colleagues, discuss solutions, and engage with our growing community!
  • Nov. 1-2: Climatetech Summit (Greentown Houston + Greentown Boston)
    • We’re inviting you, your colleagues, and all the climate champions in your life into our incubators for a day of hands-on exploration with our 200+ startups and their climatetech solutions; keynotes and sessions featuring leaders across climatetech, finance, policy, and justice; and networking with key climate action trailblazers.

Babe Ruth may have hit his last home run on May 25, but our startups will be hitting 8 more 88 years later! Join Greentown Houston and BCG X on May 25 for a pitch competition featuring Greentown startups. Prizes include a $10,000 non-dilutive cash prize and a workshop with BCG X, and there will be a fan-favorite award selected by the audience and sponsored by law firm O’Melveny & Myers, so be sure to join us if you want a vote!

If you have any questions about this event or would be interested in sponsoring future pitch days in Houston, please reach out to Investor Program Coordinator Dan Cliff. 


As a reminder, Greentown’s Pilot Digest, which we launched late last year and shared with you in Q1, will be coming out again on May 24. When it comes to solving the climate crisis, there is a pressing need to scale, implement, and commercialize new innovations as quickly as possible. New technologies need commercial validation, and often the quickest path to market is through existing incumbents. This Digest is an aggregation of our member startups that are currently seeking pilot projects with commercial or industrial partners. Those projects can range in scale, scope, and cost—all of which is laid out in detail in a quarterly newsletter with a PDF, similar to the Deal Flow Digest. It is your go-to resource to learn about our members’ planned pilot projects and how you can assist in scaling their climate solutions, either through hosting a pilot or supporting them financially.

If you are interested in receiving the most recent Pilot Digest and future editions, please reach out to Dan Cliff.


I am excited to share that our Q2 Investor Roundtables will be happening in June! Boston’s roundtable date is still TBD for early June, but our Houston Investor Roundtable will be on June 27. If you are interested in participating in the Boston roundtable, please reach out to me, and if you are interested in the Houston roundtable, please reach out to Dan Cliff.


Check out the $346M+ our members and alumni raised since last month’s newsletter:

  • Ohmium closed a $250M Series C for its green hydrogen technology.
  • Energy Dome, which has developed a “CO2 battery” for storing renewable energy, closed a ~$44M Series B round.
  •, which combines unique sensor technology with software analysis for HVAC systems, closed a $22M Series B round.
  • Ebb Carbon, an ocean-based carbon dioxide removal (CDR) startup, raised a $20M Series A round, the largest ocean-based CDR investment to date.
  • Fervo Energy, a geothermal company, received a $10M investment from Devon Energy Corp.

If you want to explore investing in our incredible community of startups, reach out to me so we can get you subscribed to our Deal Flow Digest for accredited investors.


Let’s wrap with a multitude of ways to connect with the best climatetech community around:
  • Want to check out the latest (March) Deal Flow Digest or want to get signed up for future Deal Flow Digests? Reach out to me.
  • Want to check out the latest (Q1 2023) Pilot Digest or want to get signed up for future Pilot Digests? Reach out to Dan Cliff.
  • Know people looking for a career in climatetech? Head to our job board.
  • Want more stories on our startup companies? Read the news.
  • Know climatetech entrepreneurs seeking to incubate in Boston or Houston? They can apply here.
  • Interested in realizing all the benefits of partnership? Learn more here.
  • Want to help grow our investor network? Forward this email to a friend and have them sign up here.
As always, we’re here to conspire with you in the name of climate action. Questions or thoughts about what’s ahead? Please don’t hesitate to reach out! 

Until next month,

P.S. – Keep up on all the latest climate action in between newsletters. Follow us on Twitter and LinkedIn, and if you’d like to hear from us more often, sign up for our main newsletters here and our Houston-specific newsletters here.

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