A field study · Spain, then Europe · NATO DIANA 2026
A field of 43,000 transmitters. Each one running on diesel. None of them have to.
AtomH2 stores excess solar as solid-state hydrogen and converts it back to electricity on demand - days of autonomy instead of hours, no combustion, no fuel logistics, no diesel run-trucks chasing remote sites.
"Spain's cell-tower estate burns more diesel than the country's postal fleet - and the operators are budgeting the replacement now, not in 2030."
II. The tradeDiesel · Hydride · Economics
Every tower is a small power plant. Today, it runs on diesel or fading lead-acid. That is the trade.
The trade has been stable for a decade - not because it is good, but because nothing has been ready to replace it at the right cost, the right size, and the right risk profile. Three things changed in the last 18 months.
i. Today
Diesel + lead-acid
Generators run 4,200 hrs/yr at remote sites
Batteries reach end-of-life every 4-5 years
Fuel theft and run-truck logistics in rural Spain
Direct Scope 1 emissions on every operator's books
ii. Tomorrow
Solar → H₂ → fuel cell
Solar charges metal-hydride storage by day
Fuel cell delivers continuous power overnight
72-hour autonomy with no combustion risk
One install, 20-year asset life
iii. Result
Operator economics
Median payback under 7 years on diesel-reliant sites
Scope 1 → near-zero on retrofitted towers
Decoupled from diesel price volatility
Defensible ESG narrative for tenants
The cost, honestly
~$160K today, settling to a ~$42K floor.
~$34K commodity
Cells, fuel-cell stack, PV, electrolyzer, power electronics. Priced by external markets - we ride suppliers' scale, we do not claim to beat merchant price. This is the floor.
~$8K controllable
The metal-hydride tank (our IP, additive-manufactured), assembly, test, and overhead per unit. This is what we drive down - the descent is the shrinking wedge, not magic on parts we don't own.
Footnote · Site locations are modelled (population- and terrain-weighted), not surveyed. Solar yields are real (PVGIS / Global Solar Atlas). Runtime, payback and costs are illustrative; the system is an integrator build, so cost is split into a commodity floor we ride and a controllable wedge we own. See the live tool for site-by-site economics across Europe, Spain and Slovakia.
III. Fig. 01Spain · solar yield · tower density
43,000 towers, mapped to PVGIS solar yield, sorted by payback.
Province-level priority by off-grid share, logistics difficulty, and solar yield. Andalusia and the Canaries lead. The Pyrenees and Atlantic north come second.
Fig. 01 · Spain - annual solar yield (kWh/kWp/yr) and synthetic tower density. Source: PVGIS 5.3 (EU JRC). Tower locations are population-weighted.
In the live tool
i.Tower map Every site colored by payback, solar, or priority
ii.Solar atlas PVGIS 5.3 yields, country comparison
III · Beyond SpainEurope · 30 countries · the wedge
Spain is the beachhead. The same diesel runs across Europe's islands, mountains and weak-grid edges.
The target is not "off-grid" - it is diesel runtime. Any high-reliability site that leans on a genset qualifies, whether the grid is absent or simply unreliable. We mapped the European telecom estate to find where that runtime concentrates.
34,163
Diesel-reliant sites · Europe
Telecom sites running a genset ≥1,200 h/yr.
€419M/yr
Diesel spend displaced
Across the European diesel-reliant estate.
30
Countries mapped
Site-by-site solar, runtime and payback.
1.3M+
Off-grid towers · global
The volume prize beyond Europe.
Where the runtime concentrates
Islands
Canaries, Baleares, the Greek and Portuguese islands - islanded weak grids, diesel shipped in, the best solar in Europe.
Mountains
Slovak Tatras, the Pyrenees, the Alps - remote, brutal winter access, heavy genset hours where the grid thins out.
Weak-grid east
Romania, Serbia and the Balkans - unreliable grid and ageing diesel backup that runs far more than the nameplate suggests.
Nordic north
Norway, Sweden, Finland - long grid distances and dark winters, the long-duration case solar-plus-battery cannot serve.
Spotlight · Slovakia
The cold-climate proof point.
Slovakia is where the hydrogen layer earns its keep. In the High Tatras, Low Tatras and Malá Fatra, winter sun is scarce and the grid is thin, so a genset runs hard. Low winter sun means a larger solar array and more hydrogen autonomy per site - exactly the metal-hydride tank's reason to exist. Win here and the Central-European expansion (Czechia, Romania, the Balkans) follows.
1,525
Diesel-reliant sites · SK
~4,800 h/yr
Avg genset runtime
8
Kraje · Tatras cluster
Orange · Telekom O2 · 4ka · Towercom
Operators & towerco
The bigger picture
The buyer is a deadline
Cellnex (~138,000 sites, already a pilot partner) is net-zero by 2030. Vodafone's European operations are net-zero by 2028. Deutsche Telekom targets −55% by 2030. Vantage Towers runs ~84,600 sites. Diesel cannot get any of them there - and they are budgeting the swap now.
Where we win
Solar-plus-battery is eating the easy daily-cycling sites - we sit on top, on the multi-day tail. Against the hydrogen field (GenCell's ammonia, EODev's compressed gas, AFC's fuel-as-a-service) our edge is the solid-state metal-hydride tank: low-pressure, ambient, safe - plus a hybrid no one else integrates in one box.
Europe funds the descent
The richest non-dilutive stack on the planet: EIC Accelerator (€2.5M grant + up to €10-15M blended equity, our TRL band) and the EU Innovation Fund Net-Zero call. Energy-Storage-as-a-Service removes the customer's capex entirely - they pay ~half their diesel bill, we keep the asset.
Europe is the wedge, not the prize
Europe gives references, grants and mandates. The volume is the ~1.3M off-grid towers in Africa and South Asia, where diesel runs nearly around the clock and payback is automatic - plus the same energy profile in data centers, hospitals, ports, mines and weak-grid EV charging.
An honest word on cost. A system is ~$160K hand-built today. Atom H2 is an integrator: most of the bill of materials is commodity - cells, fuel-cell stack, PV, electrolyzer - priced by external markets. We ride suppliers' scale; we do not claim to beat merchant price. The descent to a ~$42K floor comes from losing the small-volume premium plus steep learning on what we own: the tank, the assembly, the overhead.
Footnote · Site locations are modelled (population- and terrain-weighted), not surveyed. Solar is real (PVGIS / Global Solar Atlas). Runtime, payback and savings are illustrative - open the tool for site-by-site detail across Europe, Spain and Slovakia.
IV. Why this windowThree forces · 2026
Three forces are converging in 2026. Miss one and the wedge closes.
i.
The lead-acid replacement cycle
The wave of VRLA batteries deployed during the 2020-2022 5G build-out is reaching end-of-life. Operators are budgeting replacement now - and they don't want to swap like-for-like.
ii.
Diesel cost meets Scope 1 pressure
European diesel runs ~€0.43/kWh delivered. Carrier ESG commitments now bind procurement. The cost story and the carbon story finally point the same direction.
iii.
NATO DIANA validation
Selection into the 2026 cohort is a credibility wedge into US defense audiences and into commercial customers who follow the same buying logic. The window to convert that wedge is now.
V. The planThree-month sprint · Jun - Sep 2026
Climate Week + UNGA = six months of BD compressed into three weeks.
Climate Week NYC runs September 21-28, 2026, overlapping the UN General Assembly. Every investor, corporate sustainability lead, and policymaker is in Manhattan. Below is the plan, organized by who you're talking to.
Track A
Customers - the buyers who write the checks
3 entries
A1
Schedule Aug-early Sep
AT&T, Verizon, T-Mobile sustainability - 220,000 US towers, all three with carbon-neutral commitments.
+
AT&T's 2035 carbon-neutral network goal and Verizon's 2030 operations target both bind procurement to credible alternatives to VRLA + diesel. Their NYC HQs sit within walking distance in Midtown.
Prep · in advance
Run the US equivalent of the Spain analysis (OpenCelliD + PVGIS, same model). Province-level breakdown of their estate by solar potential and payback. Request meetings 6 weeks out - VP Infrastructure + VP Sustainability.
A2
Schedule Aug
American Tower & Crown Castle - tower REITs with Scope 3 pressure from every tenant.
+
AMT and CCI are the largest tower landlords globally. Both face Scope 3 pressure from tenants and ESG fund activists. The pitch: AtomH2 as a sustainability upgrade tower REITs can offer their tenants.
Prep · in advance
Pull AMT and CCI's most recent sustainability reports for backup-power language and targets. One slide showing how AtomH2 changes their Scope 3 calculus. Target IR teams first, then ops.
A3
Sep / Oct · DC or NYC
Wireless Infrastructure Association - present the Spain analysis at the sustainability working group.
+
WIA runs a working group on tower sustainability. Presenting the province-level Spain analysis there gets AtomH2 into US procurement frameworks before competitors do.
Prep · in advance
Join WIA as an associate member. Request a working-group slot. Bring a printable province-level solar + payback table.
Track B
Capital - investors who shape the round
3 entries
B1
Schedule Sep · warm intro
Breakthrough Energy + Lowercarbon Capital - NYC offices active during UNGA week.
+
BEV has a NYC office and is active during UNGA week. Airloom is a BEV portfolio company - Mike can facilitate a warm intro. Lowercarbon (Chris Sacca) is vocal on deep-tech hardware. Either fund's investment or co-sign carries enormous Series A credibility.
Prep · in advance
Coordinate intro through Mike / Airloom by early August. One-pager leading with NATO DIANA validation + Spain TAM (€3-4B) + US upside.
B2
DC day-trip · Sep week
US DFC - off-grid emerging-market financing, ~10× the Spain market.
+
The sub-Saharan Africa and South Asia off-grid tower market is roughly 10× Spain. DFC funds clean energy infrastructure in emerging markets and runs NYC meetings during UNGA week with same-week DC follow-ups.
Prep · in advance
Brief deck: off-grid telecom in Nigeria, Kenya, or Bangladesh using AtomH2. USD 5M-50M loan/equity facility for a pilot fleet. Bring IFC precedents.
B3
Apply by Aug 1
Goldman Sustain - ESG asset managers who own AT&T, Verizon, AMT, CCI in size.
+
Goldman Sustain (NYC, September) draws the asset managers who can pressure operators to decarbonize. A 10-minute slot or 1:1s during conference breaks creates investor-side pull on customer BD.
Prep · in advance
Apply for the Goldman Sustain startup showcase. Two-slide financial summary: TAM, payback economics, Series A ask.
Track C
Press, defense & trade - multipliers
4 entries
C1
Apply by Jun 15
Climate Week NYC tech demo - 3 minutes in front of 1,000+ corporate sustainability leads.
+
The Climate Group accepts startup demo applications in June. A 3-minute hardware demo at the September main program reaches 1,000+ corporate sustainability leads and journalists in a single morning - first-mover credibility before EU competitors arrive in the US.
Prep · in advance
Portable prototype or high-quality demo video by Aug 1. Apply Climate Week Open + Bloomberg Green Startup Spotlight in parallel.
C2
Pitch by mid-Aug
Bloomberg Green + Reuters Energy - the Spain map is exactly the visual story they publish.
+
Both publications do dedicated Climate Week coverage and actively seek hardware startups with data-backed market stories. 43,000 sites + PVGIS + per-province economics is exactly the kind of visual story they run.
Prep · in advance
2-paragraph pitch by mid-August: "Barcelona startup maps Spain's 43,000 cell towers for solar hydrogen conversion." Attach a screenshot of the live tool. Target: Akshat Rathi (Bloomberg Green), Nina Chestney (Reuters Energy Transition).
C3
Sep · low prep
ICEX New York - Spanish trade office that connects ES startups to US partners.
+
ICEX is the Spanish trade commission. Their NYC office exists explicitly to connect Spanish deep-tech to US partners, investors, and customers. Free meeting space, network introductions, co-branding for US investor decks.
Prep · in advance
Email ICEX NYC by August. Bring Spanish + English versions of the pitch. Ask specifically for utility and infrastructure contacts.
C4
Schedule Aug · DIANA credential
AFWERX (USAF innovation) - solid-state H₂ for forward bases. NATO DIANA opens the door.
+
NATO DIANA is a direct credential into US defense audiences. AFWERX has explicit energy-security priorities. Solid-state H₂ - no combustion, no high-pressure tanks, low IR signature - is a strong fit for forward bases.
Prep · in advance
1-page defense brief: no flammable gas venting, no diesel fuel logistics, low IR signature. Reference NATO DIANA. File AFWERX Spark Cell inquiry by mid-August. Sets up an SBIR.
Ten entries · three tracks · click any for prep notes.
VI. The scheduleThree windows · slip one and the sprint slips
Three windows. Miss one and the sprint slips.
Window 01Now → Jun 15
Lock the slots
Apply: Climate Week NYC demo
Apply: Bloomberg Green Spotlight
Apply: Goldman Sustain showcase
Join WIA as associate member
Email ICEX NYC intro
Contact AFWERX Spark Cell
Window 02Jul → Aug
Build the collateral
US tower analysis (mirror of Spain)
Defense one-pager (DIANA lead)
DFC project brief (off-grid EM)
Press pitch (Bloomberg, Reuters)
Demo kit or high-quality demo video
US entity / partnership structure
Window 03Aug → Sep 21
Schedule the meetings
AT&T, Verizon, T-Mobile (6 wks out)
American Tower, Crown Castle IR
BEV / Lowercarbon (warm intro)
DFC NYC during UNGA week
Press: Bloomberg, Reuters
Book hotel (UNGA week sells out)
VII. Talk to Steps Ventures
Want to discuss the Spain sprint, the US extension, or the DFC route?
Mike German runs the Energy & Defence advisory practice at Steps Ventures. Twenty minutes is enough to know if the sprint fits.