What SkiesFifty does

SkiesFifty is a global investment company founded in 2024 and incubated by RAIN, focused exclusively on financing decarbonization across the aviation value chain. The firm operates a single, multi-asset-class investment strategy spanning venture capital, private equity, public markets, and infrastructure, deployed across five stated verticals: sustainable aviation fuel (SAF), carbon removal, alternative propulsion, ground operations greening, and materials recycling.

The firm is staffed by a team of more than 30 professionals across offices in London (headquarters), Singapore, and Barcelona, with stated coverage of the Americas and MENA. Its portfolio comprises six disclosed companies — HiiROC (zero-emission hydrogen via thermal plasma electrolysis), Hydrobe (microalgae carbon capture), Firefly Green Fuels (SAF from biosolids via hydrothermal liquefaction), Frontline BioEnergy (biomass gasification for SAF and green methanol), Gigablue (scalable marine carbon dioxide removal), and Catalsys (ammonia-hydrogen off-grid power for ground operations). Two of these relationships are structured as joint ventures (Frontline BioEnergy, Catalsys) and one as a landmark offtake agreement (Gigablue, 200,000 tons of CO2 over four years). Strategic, non-portectorial partners include IATA, Boeing, Amadeus, the SAF Coalition, Project Sky Power, and TNO.

The business model is conventional institutional fund management: SkiesFifty raises capital from corporate, financial, and sovereign investors (Amadeus has signed a Letter of Intent to invest in the debut fund) and earns management fees plus carried interest on investments in aviation decarbonization assets. The go-to-market is sales-led, targeting airlines, aircraft manufacturers, fuel producers, financial institutions, sovereign investors, and travel technology companies via direct engagement, industry partnerships, and coalition-building — a model that monetizes both financial returns and the firm's positioning as a catalytic sector convener. The company is part of The Fifty Group of businesses, with RAIN serving as the parent organization providing investment infrastructure.

Name

SkiesFifty

Legal name

SkiesFifty

Website

https://skiesfifty.com

Company type

Private

Founded year

2024

Operating status

Operating

Headcount range

11–50 employees

Short description

SkiesFifty is a London-headquartered global investment company founded in 2024 that finances aviation decarbonization across venture, private equity, public markets, and infrastructure, targeting sustainable aviation fuel, carbon removal, alternative propulsion, ground operations, and materials recycling for institutional and corporate investors.

Ownership category

akta.pro rank

Product category

Aviation Investment Management

NAICS

Funds, Trusts, and Other Financial Vehicles (525), Open-End Investment Funds (525910)

SIC

Investment Advice (6282)

akta.pro primary industry

Carbon Markets & Climate Finance (Offsets, Allowances, Carbon Funds) (FSAAALAH)

akta.pro secondary industries

Climate Finance, Carbon Markets & MRV Systems (BPADALAB), Climate Finance Strategy (CapEx planning, green finance, incentives & grants) (EUABAKAG), Sustainable Aviation Fuel (SAF) & Alternative Fuels (e-fuels, biofuels, hydrogen) (THABANAA), Sustainability & Emissions Management for Air Travel (SAF, CO2 Reporting) (THACAHAJ)

Keywords

• Aviation investment management
• Sustainable aviation fund
• Carbon removal finance
• Clean fuel investment
• Climate technology capital

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure, Others

Revenue model

1. Fund Management: Investment fund management generating returns through management fees and carried interest from investments in sustainable aviation technologies across multiple asset classes.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Core offering

SkiesFifty is a global investment company that raises and deploys a debut aviation-focused fund across venture capital, private equity, public markets, and infrastructure to accelerate aviation's transition to net-zero by 2050. The fund invests in five verticals: sustainable aviation fuel (SAF), carbon removals, alternative propulsion, ground operations greening, and materials recycling. The firm acts both as investor and advisor, building partnerships and coalitions among airlines, manufacturers, fuel producers, financial institutions, sovereign investors, and travel technology firms.

Product overview

SkiesFifty is a global investment company that operates as a single unified investment fund focused on sustainable aviation. The fund's core strategy involves catalytic capital deployment across multiple asset classes (venture capital, private equity, public markets, infrastructure) to accelerate aviation's transition to net-zero. SkiesFifty's investment portfolio comprises seven portfolio companies: HiiROC (zero-emission hydrogen via thermal plasma electrolysis), Hydrobe (microalgae carbon capture), Firefly Green Fuels (SAF from sewage waste), Frontline BioEnergy (biomass gasification for SAF/methanol), Gigablue (marine carbon dioxide removal), and Catalsys (ammonia-powered off-grid power). The fund targets sustainable aviation fuel, carbon removals, alternative propulsion, ground operations greening, and materials recycling as its five core investment verticals.

Differentiator

Problem solved

Functional benefit

Products and services

• SkiesFifty Investment Fund A global investment fund with dual objectives of accelerating aviation's journey towards net-zero emissions by 2050 while generating attractive financial returns. The fund invests across venture capital, private equity, public markets, and infrastructure into five core verticals: sustainable aviation fuel, carbon removals, alternative propulsion, ground operations greening, and materials recycling. It is targeted at corporate and institutional Limited Partners including airlines, aircraft manufacturers, fuel producers, financial institutions, sovereign investors, and travel technology companies.

Quantifiable outcome

• Aviation accounts for ~2.5% of global emissions (~4-6% including non-CO2 effects)
• +2 more outcomes

Segments7 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

16 partnerships are on record, tiered core and secondary.

• GigabluecoreStrategic or Co-development Partner · 1 January 2025Gigablue is the world's largest supplier of scalable marine carbon dioxide removal solutions. SkiesFifty and Gigablue expanded partnership in 2025 with landmark agreement to sequester 200,000 tons of CO2 over four years.
• IATAcoreStrategic or Co-development Partner · 1 January 2024SkiesFifty is an IATA strategic partner collaborating on initiatives to accelerate SAF adoption and sustainable technologies. In 2024 they presented at several IATA conferences together, sharing commitment to policy advocacy, industry research, and best practices development.
• BoeingcoreStrategic or Co-development Partner · 1 January 2024Boeing and SkiesFifty joined forces to accelerate sustainability solutions for aviation. In 2024 they worked together to support testing and advancement of Firefly Green Fuels' cutting-edge technology to increase SAF production in the UK.
• TNOcoreStrategic or Co-development Partner · 1 January 2024SkiesFifty signed a collaboration agreement with TNO, the Netherlands' leading independent applied research organisation, to strengthen the technical foundation of SAF investment decisions. TNO provides independent technical assessments, techno-economic analyses, and system-level insights.
• AmadeuscoreStrategic or Co-development PartnerSkiesFifty collaborates with Amadeus to support sustainable travel initiatives. Joint efforts focus on optimizing flight operations, reducing carbon footprints, and promoting SAF adoption to drive a more responsible travel ecosystem. Amadeus has signed LOI to invest in SkiesFifty's debut fund.
• XeleratedFiftycoreStrategic or Co-development PartnerXeleratedFifty is a global accelerator and innovation platform transforming heavy industries. They partner to bring advanced technologies in-house, address urgent industry needs, and foster continuous innovation through funding, expert training, mentorship, and deep industry access.
• SAF CoalitioncoreStrategic or Co-development PartnerThe SAF Coalition is a multi-stakeholder initiative dedicated to accelerating SAF development and deployment. SkiesFifty partners to align efforts in scaling up SAF production, advocate for supportive regulatory frameworks, invest in SAF infrastructure, and collaborate on research.
• Project Sky PowersecondaryStrategic or Co-development PartnerProject SkyPower is led by 15 CEOs from key organizations across the e-SAF value chain in Europe. SkiesFifty engages as a strategic partner to identify and support promising innovations through research, investment, and advocacy.
• Sustainable Aviation Future CongresssecondaryGTM or Marketing PartnerSkiesFifty partners and team members regularly attend SAF Congress events to stay at the forefront of SAF developments and engage with key industry players through presentations, panel discussions, and working groups.
• RAINcoreStrategic or Co-development PartnerSkiesFifty is an initiative from RAIN and benefits from the extensive finance and investing experience of the RAIN team. RAIN is the parent organization providing investment expertise.
• The Fifty GroupcoreStrategic or Co-development PartnerThe Fifty Group is a network of businesses advancing sustainability through innovation, investment and action spanning aviation, shipping, clean fuels, carbon removal, venture capital and structured finance. SkiesFifty is one of the group companies.
• HiiROCcoreStrategic or Co-development PartnerHiiROC produces low-cost, zero-emission hydrogen through Thermal Plasma Electrolysis. SkiesFifty partners to unlock sustainable hydrogen applications in aviation and synthetic fuels, integrating HiiROC's production systems into SAF and power-to-liquid projects.
• HydrobecoreStrategic or Co-development PartnerHydrobe uses pioneering microalgae technology to capture CO2 and produce high-value bio-products. SkiesFifty and Hydrobe collaborate to accelerate deployment of carbon capture and bio-conversion systems across aviation and adjacent industries.
• Firefly Green FuelscoreStrategic or Co-development PartnerFirefly produces SAF from treated human waste (biosolids) using hydrothermal liquefaction. SkiesFifty's investment strength and expertise helps FireFly fund future growth, expand operations, and target markets. Firefly plans commercial-scale production by 2030.
• Frontline BioEnergycoreStrategic or Co-development PartnerFrontline BioEnergy specializes in biomass and waste gasification technology producing renewable natural gas, hydrogen, and chemicals. SkiesFifty and Frontline joined forces through a joint venture to produce SAF and green methanol for aviation and maritime sectors.
• CatalsyscoreStrategic or Co-development PartnerCatalsys provides portable, off-grid power solutions using ammonia-hydrogen blend generators. SkiesFifty and Catalsys formed strategic partnership to accelerate decarbonization in aviation through carbon-free electricity for ground operations and exploring alternative propulsion.

Scale indicators4 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Generate Capital: Generate Capital is a sustainable infrastructure investment platform investing across venture, growth, and infrastructure in sectors including power, mobility, and industrial decarbonization. Highly comparable to SkiesFifty's multi-asset-class approach to aviation decarbonization, with similar blend of operator expertise and catalytic-capital mandate.
• Clean Energy Ventures: Clean Energy Ventures is an early-stage venture capital firm focused on climate technology including fuels, hydrogen, and carbon removal. Comparable to SkiesFifty's VC-stage climate technology investment approach, with similar focus on breakthrough decarbonization technologies.
• Breakthrough Energy Ventures: Founded by Bill Gates, Breakthrough Energy Ventures is a multi-billion-dollar climate technology VC fund backing companies across SAF, hydrogen, carbon removal, and alternative fuels. Directly comparable as a dedicated climate investor overlapping substantially with SkiesFifty's investment verticals.
• Prime Coalition: Prime Coalition is a nonprofit climate finance platform that mobilizes catalytic capital into early-stage climate technologies. Comparable mission-driven climate finance model, although SkiesFifty is a commercial for-profit fund while Prime Coalition operates as a philanthropic financier.
• Lowercarbon Capital: Lowercarbon Capital is a venture capital firm backing climate technology companies across energy, transportation, carbon removal, and sustainable fuels. Directly comparable as an aviation- and fuel-focused climate investor at the early growth stage.
• Energy Impact Partners: Energy Impact Partners is a global climate tech and sustainable infrastructure investment platform backed by a coalition of utilities and industrials. Comparable to SkiesFifty as a coalition-driven climate investor with deep corporate-strategic LP base and focus on early-to-growth stage decarbonization.
• Pollination: Pollination is a global climate advisory and investment firm combining advisory, capital, and asset management to accelerate decarbonization. Highly comparable hybrid advisory-investor model focused on industrial and aviation sector transition, with similar blend of operator experience and catalytic capital deployment.

Others

• Mission Possible Partnership: Mission Possible Partnership is an industry coalition facilitating industry-wide decarbonization across aviation, shipping, and heavy industry. Comparable ecosystem participant that SkiesFifty engages alongside through industry alliances, though MPP is non-commercial and coalition-led rather than an investor.

Broad incumbents

• TPG Rise Climate: TPG Rise Climate is a multi-billion-dollar climate-focused private equity fund investing in decarbonization solutions across sectors including transportation and energy. A larger incumbent climate investor with overlapping mandates in aviation-adjacent decarbonization and significantly greater AUM.
• BNP Paribas Energy Transition Fund: BNP Paribas Asset Management operates dedicated energy transition and climate funds, including sustainable aviation finance initiatives. Comparable as an institutional investor in sustainable aviation and clean fuels, though part of a much broader global asset management franchise.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/skiesfifty

Revenue estimate

Valuation estimate

Number of profiles

Profiles15 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SkiesFifty