Declan McEvilly, Co-Founder of OnePlanetCapital, on Adopter's Scaling Green-Tech podcast.
September 16, 2026

Episode 32: Declan McEvilly (OnePlanetCapital) - The Case for Efficiency Investing

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Episode summary

Declan McEvilly, Co-Founder of OnePlanetCapital, discusses efficiency investing and what makes early-stage climate technology investable on Episode 32 of Scaling Green Tech, a podcast by Adopter.

McEvilly argues that climate technology should be reframed as efficiency investing, on the basis that the technologies worth backing make an end user measurably more efficient, with carbon reduction following as a consequence. He contrasts this with what OnePlanetCapital call voluntary contribution businesses, meaning companies that ask a consumer or corporate to pay a premium for a sustainable option, a category that has struggled through higher interest rates and a cost of living crisis. The fund screens every opportunity against three carbon tests and requires each portfolio company to agree on a measurable KPI before investment is completed. Across six years and around 60 investments, McEvilly reports on portfolio trends and performance. 

This episode is relevant for pre-seed and seed climate technology founders preparing an EIS or SEIS raise, angel and retail investors evaluating climate funds, and B2B marketers working on investor-facing messaging and pitch deck narrative for deep tech companies.

Guest profile

Declan McEvilly is Co-Founder of OnePlanetCapital. He has worked in venture capital and private markets for close to 15 years, focused on helping private companies fundraise and grow. He co-founded OnePlanetCapital six years ago after identifying a gap in UK private market investment schemes, which at the time offered investors little climate-focused exposure. As Sales Director, McEvilly manages OnePlanetCapital's relationships with financial advisers, intermediaries and investors. 

OnePlanetCapital is a specialist climate technology investor backing UK businesses from seed to pre-Series A. The fund invests under the Enterprise Investment Scheme and Seed Enterprise Investment Scheme across energy, transport, construction, packaging, and waste and recycling. It has made around 60 investments. The fund was originally the OnePlanetCapital Sustainable EIS Fund and now operates as the Climate Change EIS Fund.

Company website: https://www.oneplanet.capital/

Find Declan McEvilly on LinkedIn

Key takeaways

  • OnePlanetCapital screens every opportunity against three carbon tests: whether the business directly removes carbon, displaces carbon, or supports a transition to a less carbon-intensive environment. 
  • Every OnePlanetCapital portfolio company agrees on a measurable carbon KPI before investment completes, which the fund uses to report impact to its underlying retail investors.
  • The fund has made around 60 investments over six years, holds board seats at approximately 40 of them, and has recorded three failures and no exits to date.
  • McEvilly describes the main cause of startup failure as running out of runway rather than technology failing or demand not existing.
  • McEvilly spends between four and ten minutes on a first read of a pitch deck, and recommends an eight-slide deck for cold outreach with a longer 25 to 30 slide version for follow-up.
  • Total addressable market is not traction. McEvilly places market sizing on the problem slide and reserves the traction slide for revenue, pipeline, and customer conversations that have already happened.
  • OnePlanetCapital contacts a founder's existing customers as part of due diligence, asking the founder to introduce their best client so the fund can test why that customer buys and how embedded the technology is.
  • Air conditioning accounts for approximately 10% of global power usage, a figure McEvilly expects to rise, which underpins the fund's investment in Verv.

topics covered

  • Explaining a climate VC fund to a five-year-old
  • OnePlanetCapital's investment thesis and the three carbon scopes
  • Reframing climate technology as efficiency investing
  • Repositioning a fund from sustainable to climate technology
  • Three value drivers for retail climate investors
  • Hardware versus SaaS in climate portfolios
  • Runway, burn rate, and why startups actually fail
  • UK startup infrastructure and the scale-up cliff edge
  • Raising in the US and the valuation trap
  • What makes a good pitch: problem, solution, traction
  • Content, thought leadership, and selling trust
  • Climate adaptation and grid transition as growth sub-sectors

Frequently asked questions

What are EIS and SEIS?
What is efficiency investing?
What do early-stage investors look for in a climate tech pitch deck?
Why has it become harder for climate startups to raise funding?
Should a UK climate startup raise in the US?
Which climate technology sectors are attracting investment in 2026?

About Scaling Green-Tech

Scaling Green-Tech by Adopter is a podcast for people shaping the future of climate technology - founders, investors, and ecosystem leaders at the forefront of adaptation and resilience solutions. As part of Adopter’s mission to accelerate the adoption of high-impact climate innovation, the podcast aims to amplify real voices and practical insights that can help others navigate the startup journey. These conversations go beyond the hype to bring real, unfiltered stories - the wins, the roadblocks and everything you need to know in between.

Read the full transcript here
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