Invinity Energy Systems Posts 2024 Results as ENDURIUM Transition Advances

The Big Pivot: Invinity’s Transition Year Unpacked

Invinity Energy Systems’ 2024 results land as the company executes a critical strategic shift – moving from its legacy VS3 battery to the next-generation ENDURIUM platform. While the headline revenue figure (£5.0m vs £22.0m in 2023) might cause a double-take, this is a classic transition-year story where the real meat lies beneath the surface. Let’s crack open the nuts and bolts.

Financials: The Bridge Between Technologies

Yes, revenue dipped sharply. But crucially, this was expected and reflects the deliberate winding down of VS3 sales while ramping up ENDURIUM. More telling are these signals:

• EBITDA Improvement: Adjusted EBITDA loss narrowed 20% to £18.0m – showing cost discipline during the shift.
• Fortress Balance Sheet: Cash reserves ballooned to £32.4m (up from £5m in 2023) following a successful £57.4m fundraise. Crucially, the group remains debt-free.
• Gross Loss Context: The £3.5m gross loss includes £2.1m in provisions for *legacy* components (S4 stack/converters), not indicative of ENDURIUM margins.

CFO Adam Howard notes 2025 projects are already being signed at positive gross margins – a vital step towards sustainability. The cash runway, bolstered by the NWF-led fundraise, provides essential breathing room to navigate this product transition.

ENDURIUM: Not Just a New Battery, a New Trajectory

The star of the show is undoubtedly ENDURIUM, launched in December 2024. This isn’t just an incremental upgrade; it’s designed to hit the sweet spot of the burgeoning Long Duration Energy Storage (LDES) market (6-18 hours). Why the excitement?

• Performance Delivered: The first 1.2 MWh system at Gamesa Electric’s La Plana site is operational and performing in line with expectations – a crucial early validation.
• Cost Down, Right Now: A standout achievement is the 24% cost reduction on ENDURIUM achieved year-to-date in 2025 versus the first order. Management is targeting “further material reductions” by end-2025.
• Built for Scale & Safety: Leveraging Invinity’s proven vanadium flow chemistry (non-flammable, 25-year+ lifespan, no degradation), ENDURIUM adds higher efficiency (75% round-trip), greater energy density, reduced installation complexity, and AI-driven optimisation.

President Matt Harper emphasises ENDURIUM’s design tackles fundamental grid challenges: delivering abundant, low-cost, clean power on demand, safely, and without the geographical constraints of alternatives like pumped hydro.

Market Tailwinds: LDES Policy Shifts Create Golden Opportunity

2024 wasn’t just about product development; it saw a seismic shift in policy recognising LDES as critical for grid stability amid renewable growth. This plays directly into Invinity’s hands:

• Lithium’s Loss is Flow’s Gain: High-profile safety incidents (e.g., Moss Landing) and geopolitical supply chain risks are pushing major LDES procurement programmes (UK, Ontario, California, New York, Australia) to actively favour or even exclude lithium-ion. ENDURIUM’s safety profile is a major advantage.
• UK Front and Centre: The UK’s LDES Cap and Floor Scheme is a game-changer. The strategic partnership with Frontier Power targeting up to 2 GWh of Invinity batteries specifically for this scheme underscores the massive potential.
• Deals Getting Bigger: Average deal size has surged 315% in 2025 YTD vs 2024, moving the company firmly towards the gigawatt-scale projects needed for profitability.

CEO Jonathan Marren puts it bluntly: “The rhetoric on batteries was notably transformed throughout 2024… The opportunity ahead of us is enormous.” Recent grid outages in the UK and Europe only amplify the urgency for LDES solutions like Invinity’s.

Leadership & Execution: The Marren Doctrine

Since taking the helm in September 2024, Jonathan Marren set five clear 12-month goals. Progress is tangible:

1. Revenue Targets Met: Hit revised forecasts via shipments like the 4 MWh project with EDF Renewables NA and the first ENDURIUM to Gamesa.
2. ENDURIUM Launched: Delivered on time for general sale by end-2024.
3. Commercial Pipeline Advancing: Secured the Frontier JV (2GWh), a 10.8 MWh repeat order in Hungary, and progressed the 20.7 MWh LoDES project (potentially Europe’s largest VFB).
4. Cost Reduction On Track: The 24% cost cut on ENDURIUM speaks for itself.
5. Operational Efficiency: Streamlining via UK redomicile (reducing cost/complexity) and ERP implementation.

Marren acknowledges challenges remain, particularly in scaling manufacturing and converting pipeline opportunities into firm orders amidst lithium price volatility. However, the tone is one of focused confidence: “I firmly believe we are in a strong position to take our place at the forefront of this shift.”

The Bottom Line: Positioning for the LDES Surge

Invinity’s 2024 was a foundational year. It sacrificed near-term revenue to:

• Launch a competitively priced, next-gen product (ENDURIUM) validated in the field.
• Secure a war chest (£32.4m cash) providing ample runway.
• Position itself squarely within lucrative, policy-driven LDES markets favouring its technology.
• Demonstrate serious progress on crucial cost reduction targets.

The AQSE delisting (retaining AIM) simplifies the structure. While the path to profitability hinges on converting the substantial pipeline (especially the gigawatt-scale LDES opportunities) and further cost-downs, the pieces are now strategically aligned. Invinity isn’t just building batteries; it’s building the infrastructure for a more resilient, renewable-powered grid. The next 12-18 months will be critical in proving they can execute at the scale the market – and their investors – demand.

Key Watch Point: Progress on converting the Frontier Power JV and other large LDES scheme bids into firm orders, alongside hitting the next ENDURIUM cost reduction milestones, will be the true barometers of success in 2025.