How can existing UK public finance support for 
growth-stage climate tech be optimised to bridge 
the ‘missing middle’ financing gap?
Scaling growth-
stage climate 
tech companies
July 2024


Barclays’ Group Policy Development 
team creates public policy thought 
leadership content on behalf of 
Barclays. Our work draws on the bank’s 
expertise, data and insights, and is 
intended to inform the design and 
application of public policy solutions 
in response to pressing economic and 
societal challenges. 
The intended audience for this report 
is public policymakers and other actors 
engaged in shaping public policy. Any 
views expressed in this report are those 
of the author(s) and may differ from 
those of the wider Barclays group. The 
report is general in nature and provided 
for information/educational purposes 
only. It does not take into account any 
specific investment objectives, the 
financial situation or particular needs of 
any particular person. It is not intended 
for distribution, publication, or use in 
any jurisdiction where such distribution, 
publication, or use would be unlawful, 
nor is it aimed at any person or entity 
to whom it would be unlawful for them 
to access.
©Barclays 2024
About this report
Contents
1.	
Summary	
3
2.	
Gap analysis and research question	
4
Why is financing at this stage of climate tech 
scale-up challenging for the private sector?	
5
A fragmented policy landscape	
6
Barclays is supporting firms at this critical 
stage on the climate tech ‘escalator’	
9
Climate tech needs to be scaled up now if it is 
to deliver in time to enable net zero targets	
10
3.	
Methodology	
11
4.	
Results	
12
(i) Financing	
12
(ii) Approach to public finance 
and government support	
13
Insights	
14
5.	
Policy recommendations	
15
Recommendation 1: Address the financing 
gap between £10m and £25m ticket sizes 
in direct public support for companies	
16
Recommendation 2: Bolster impact of 
public finance institutions through maximising 
deployment of existing tools and mandates, 
and expanding available financing mechanisms	
18
Recommendation 3: Improve organisational 
connection and collaboration	
21
Recommendation 4: Consider whether 
the existing infrastructure of UK public 
finance institutions operates within the 
most effective structure	
22
Scaling growth-stage climate tech companies


Summary
SUMMARY  |  3
The scale-up of climate tech will be 
critical for the net zero transition, but 
financing currently falls short of what 
is needed to deliver the transition, 
with only about 16% of global climate 
finance needs currently being met. 
This finance gap is not evenly spread 
across financing rounds, with a 
particular gap in the UK at Series B+/ 
growth rounds where the features of 
these firms, and the type of investment 
needed, provide a challenge for 
traditional forms of financing.
Drawing on insights from Barclays 
support for climate tech companies 
as they scale, this report looks at 
how existing UK public finance can be 
optimised to best support growth-
stage climate tech companies and 
bridge the ‘missing middle’ finance gap. 
This report therefore sits alongside 
adjacent policy workstreams such as 
how best to deploy the additional 
capital earmarked for the National 
Wealth Fund and, separately, the extent 
to which public policy can or should 
encourage pension fund assets to 
be deployed into UK private markets 
including growing companies.
Our results highlight the challenges 
many companies face in securing 
finance to scale, with the key features 
of climate tech firms – high capex 
requirements with longer paths to 
profitability – resulting in a risk profile 
that creates barriers to securing 
traditional investment. Firms often 
need help to navigate and access a 
fragmented landscape of public 
finance support available, and investors 
look to clear commitments from 
government to give them confidence 
to invest in the growth and development 
of climate tech. 
To overcome these challenges, this 
paper puts forward a series of 
recommendations on how public 
finance institutions can best support 
climate tech companies at the growth 
stage. This includes addressing a gap 
in direct public finance support for 
companies, maximising deployment 
of existing tools and mandates, 
improving organisational collaboration, 
and considering the most effective 
operating structure across the 
landscape of UK public finance 
institutions. 
Scaling growth-stage climate tech companies
$4.35 trillion
THE FIGURE THAT CLIMATE FINANCE 
MUST INCREASE TO ANNUALLY BY 2030 
TO MEET CLIMATE TARGETS
1,2,3
<  BACK TO CONTENTS
Climate tech, short for 
climate technology, 
refers to the physical 
and digital technologies 
that will reduce or 
remove greenhouse gas 
emissions or improve 
resilience or adaption to 
the physical impacts of 
climate change.


GAP ANALYSIS  |  4
Globally, only about 16% of climate finance needs are 
currently being met, meaning climate finance must 
increase more than six-fold – to $4.35 trillion annually 
by 2030 – to meet climate targets.1,2,3 As part of this, 
there is an urgent need to finance and scale climate tech 
– which we use here to mean technology or new business 
models that seek to address climate change, through 
directly mitigating or removing emissions, improving 
resilience or adaptation to the physical impact of climate 
change, or through deepening our understanding of 
climate and nature. According to the International Energy 
Agency, an estimated 35% of greenhouse gas emission 
reductions required by 2050 will come from technologies 
not yet on the market.4 
But financing for climate tech currently falls short of what 
is needed to deliver the transition – and this gap is not 
spread evenly across financing rounds. Early seed and 
venture rounds by UK-headquartered climate tech companies 
have almost quadrupled in value since 2012, rising from 
around £100m in 2012 to almost £400m in 2021.5,6,7 
On the other end of the scale, established infrastructure 
and debt financing is available for larger companies with 
a demonstrated commercially viable product. 
Gap analysis 
and research question
Yet, there is a ‘missing middle’ at the Series B+/ growth 
rounds, where climate tech companies are seeking 
finance for high-potential but not yet commercially 
deployed technologies.8 Funding provided at this stage 
fell 48% year on year in the first half of 2023,9 and data 
from the UK Cleantech Group suggests that from 2018 
to 2022, a £1.5bn climate tech financing gap has 
emerged at Series B.10,11,12
Scaling growth-stage climate tech companies
£1.5bn
The climate tech financing gap 
that emerged from 2018 to 2022 
at Series B
10,11,12
(UK Cleantech Group)
1.  Environmental Finance. Financing the ‘missing middle’ for climate tech. 2023
2. World Fund estimate that climate finance must increase by at least 590%, to $4.35tn annually, to meet climate targets. World Fund.
 White Paper : Investing in Climate Tech – An Opportunity for Europe. 2023
3. Deloitte. Could technology innovations help reverse the climate change trajectory? Not without a lot more money. 2023 
4. International Energy Agency. Net Zero Roadmap: A Global Pathway to Keep the 1.5°C in Reach – 2023 Update.
5, 6. Department for Energy Security and Net Zero (DESNZ). Market assessment – UK venture capital market for early-stage clean tech companies. 2023 
7. KPMG. Venture Pulse Q4 2021: Global analysis of venture funding. January 2022 
8. S2G Ventures. The Missing Middle: Capital Imbalances in the Energy Transition.
9. Sifted. Is the party over for ‘recession-proof’ climate tech? 2023
10, 11. Cleantech for UK. Building the next generation of cleantech champions.
12. Barclays Corporate. From science fiction to decarbonisation: Scaling climate technology for positive global impact
16%
35%
48%
Climate finance 
needs currently 
being met globally1,2,3
Greenhouse gas emission 
reductions in Europe likely 
needed to come from new 
technologies by 20504 
Fall in Series B growth 
funding for European 
climate tech year on year 
in the first half of 20239
IN NUMBERS:
>>
<  BACK TO CONTENTS


GAP ANALYSIS  |  5
Much of the capital to meet the climate tech financing 
gap will come from the private sector, especially once 
these technologies become commercially proven and 
attractive.13,14 But the financial profile of these climate 
tech companies creates barriers to securing the financing 
needed to reach this stage (Box 1). 
Given this mismatch between the financial profile of 
capex-heavy climate tech companies, and the investment 
profile requirements of various financial players in the 
market, consideration is needed of how to rebalance the 
risk profile of climate tech growth financing to allow for 
a wider pool of traditional investors to participate. 
Why is financing at this stage of climate tech 
scale-up challenging for the private sector?
Scaling growth-stage climate tech companies
This might involve approaches such as the development of 
innovative private financing structures, or targeted public 
finance intervention to create blended finance solutions. 
Public policy and finance can play a key role in helping 
reduce and transfer risks.15 Recognising the benefits and 
necessity of climate tech, governments globally have been 
directing public support and subsidies to support climate 
tech firms through their lifecycle. Yet, given the evidenced 
gap in financing for scaling climate tech companies, this 
note will consider whether existing public support is 
sufficient to bridge the ‘missing middle’ financing gap. 
Drivers of the ‘missing middle’ – what may cause the climate 
tech growth finance gap?
INVESTOR NEEDS
This combination creates a risk/return profile that is 
challenging for a range of investors seeking a more 
traditional risk profile and non-concessionary returns:
Banks
Whilst traditional bank debt instruments usually provide the 
capital to support a large increase in technology deployment, 
they will usually require clear track records and evidence of 
steady cash flow, and banks typically have a lower risk 
tolerance for failure in their portfolios.16 These features are 
often missing from climate tech companies at this stage, 
especially given those delivering First of a Kind (FOAK) 
technologies, which in many cases will not yet be profitable. 
Venture capital (VC)
Whilst VCs are usually more comfortable with the variable cash 
flow and risk profile of early-stage climate tech companies, 
scaling these businesses will be significantly more capital-
intensive than the software companies in which VCs are 
traditionally accustomed to investing. The profile of revenues 
is also further out than the usual three to five years VCs are 
looking for. For example, McKinsey estimates that the time 
from Series A to D for digital marketplaces is three years, 
versus around seven for climate technologies.17 
Private equity 
These actors will traditionally invest into businesses that 
are already cash flow-positive, which many climate tech 
companies are unlikely to be at this stage.18
The climate tech growth 
financing gap may be 
explained by the key 
features that make 
companies at this stage 
a challenge to finance. 
These include: 
 
• Capital expenditure-
intensive with high 
upfront costs 
• Long timeframes 
to profitability
• Commercial uncertainty 
• Often requiring technical 
or scientific knowledge to 
understand revenue drivers 
and scale potential
FINANCING PROFILE 
This mismatch 
between 
financing 
profile and 
investor needs 
drives the 
‘missing 
middle’ 
financing gap.
13. Blended Finance Taskforce. Better Guarantees, Better Finance: Mobilising capital for climate through fit-for-purpose guarantees. 2023 
14. Our World in Data. Why did renewables become so cheap so fast? 2020. 
15. United Nations Framework Convention on Climate Change (UNFCCC). Enhancing Access to Climate Technology Financing (TEC Brief #6). 2015
16. PWC. State of Climate Tech 2023: How can the world reverse the fall in climate tech investment? 2023 
17, 18. McKinsey. A different high-growth story: The unique challenges of climate tech. 2024 
BOX 1:
>>
<  BACK TO CONTENTS
