01 / 07
Device ACE One
18:42 in Thiès. The fan spins up, and the onboard microprocessor starts logging - fan runtime, battery, charge state. Every second of this session is being recorded on the stove itself.
CARBON & IMPACT
The data earned us the compliance market.
Most cookstove projects sell voluntary credits based on survey estimates. ACE sells compliance-grade credits backed by measured stove usage.
Fifteen years of operations. 100,000+ units deployed. Connected microprocessors in every ACE One since 2019, logging each cooking session.
Measured usage
CAMBODIA · JUNE 2026 Fan runtime · average day across the fleet
00:00 06:00 12:00 18:00 24:00
↑ Morning cook ↑ Evening cook
1,853
Stoves reporting
19,694
Fan-hours measured
3.7 hrs
Avg cooking day
Aggregated from synced ACE One telemetry, Cambodia, June 2026. Times are device-reported.
Observed → Synced → Verified → Credit
15+
Years of operations
100,000+
Units deployed
5
Countries
Compliance
Carbon programme
THE MRV PIPELINE
From device to verified credit.
Every credit ACE issues passes through this stack. No estimates, no surveys - every stove, every cooking session, every month.
02 / 07
App sync ACE Connect
Days later a phone passes within range - the household's own, or a field agent's on a visit. The stove's log syncs wirelessly through ACE Connect. Nothing is lost in the meantime: the log lives on the device until it is collected.
03 / 07
Ingest Salesforce
The session lands on this stove’s own record, keyed by serial number - alongside every session it has ever cooked. One stove, one record, a full usage history.
04 / 07
Warehouse BigQuery
The session joins the fleet: millions of log entries, deduplicated, quality-checked, and locked in. This is the dataset everything downstream stands on.
05 / 07
Field test KPT
Quarterly Kitchen Performance Tests sample real kitchens at 95% confidence / 5% precision, anchoring the link between measured fan runtime and fuel actually saved.
06 / 07
Audit VVB
An accredited independent verifier audits the whole trail - device to warehouse to calculation - before anything is claimed. If usage data is missing for a stove, no credit is claimed for it.
07 / 07
Credit ITMO
Only then does the evening in Thiès become part of a verified credit under Article 6 of the Paris Agreement. Measured, synced, audited - then, and only then, monetised.
ARTICLE 6 OF THE PARIS AGREEMENT
Sovereign-grade carbon, because the data holds up.
Article 6 is the Paris Agreement mechanism that enables sovereign-level transfer of verified emission reductions between countries. It is how compliance buyers meet legally binding climate obligations.
ACE's carbon programmes sit in this market - not because we talked our way in, but because our device-level monitoring produces the kind of data compliance buyers can underwrite.
CARBON INTEGRITY
Five rules we don't break.
Clean cooking carbon has a credibility problem. We built our programme around not repeating the sector's mistakes.
01
Device-level monitoring
Usage recorded for each individual stove, not estimated from samples or surveys.
02
Conservative accounting
Leakage deductions, precision discounts, and statistical validation applied to all calculations.
03
No data, no credit
If usage data is missing for a stove during a monitoring period, no emission reductions are claimed.
04
Independent verification
All emission reductions validated and verified by accredited third-party bodies.
05
Rigorous field testing
Quarterly Kitchen Performance Tests at 95% confidence / 5% precision - more rigorous than typical cookstove projects.
BEYOND THE CREDIT
Carbon pays the bill. Dignity is the point.
Every stove ACE puts in the field produces a verified credit. It also returns clean air to the kitchen, hours to a woman’s day, standing trees to the landscape, and cash that was quietly leaking out of the household. Four outcomes the carbon number alone doesn’t capture, and the reason ACE exists.
3.2M
premature deaths each year
HEALTH
Household air pollution from cooking smoke is one of the largest environmental health risks in the world (WHO). Independent field assessment classified the ACE stove as “very cost-effective” at averting disability-adjusted life years, which is WHO’s benchmark for high-impact health interventions.
Source: WHO; Berkeley Air Monitoring Group / SNV, Cambodia.
~1 day
per week, reclaimed
TIME
In rural markets like Lesotho, households typically spend around three hours a day, roughly one full day every week, gathering firewood. The work falls disproportionately on women and girls. A cleaner stove gives that day back. ACE Connect’s in-app fuel shop exists for the same reason: so energy isn’t a chore.
Source: ACE operational observations, rural Lesotho.
>half
less wood burned
FORESTS
On paper, regrown biomass is “renewable.” On the landscape, the standing tree is gone. Independent field studies of ACE stoves show household wood use cut by well over half, which means more trees left standing around the village, not felled and counted as carbon-neutral.
Source: Berkeley Air Monitoring Group / SNV, Cambodia.
25–50%
of income spent on energy
COST
In rural markets where ACE operates, many households spend upwards of a quarter of their income on energy, sometimes as much as half. Kerosene for lighting, candles, paying shops to charge a phone, disposable batteries, firewood or charcoal burned at a fraction of the achievable efficiency. It is expensive to be poor. One ACE One collapses most of that stack into a single device.
Source: ACE operational observations, rural Lesotho.
As a retired nurse I understand what great positive influence the ACE One has on one's lungs.
Dorothy
Retired nurse · Agule Palisa, Uganda
ACE Social Impact Report 2022
OUR JOURNEY
15 years, one through-line.
From a single factory in Lesotho to a compliance-grade carbon programme across five countries.
2011
ACE founded in Lesotho by Stephen Walker and Ruben Walker
2012
First manufacturing facility opens in Ha Thetsane, Maseru
2014
ACE One launched as ACE's own product
2016
Operations begin in Cambodia and Uganda
2019
Digital monitoring systems and ACE Connect development begins
2020
Cambodia factory opens in Siem Reap
2021
Ruben Walker named EY Impact Entrepreneur of the Year
2022
Uganda factory opens in Gulu
2025
Operational restructuring. ACE Energy Holdings BV established. Kenya factory opens in Mombasa-Kwale. 100,000+ units deployed.
2026
Senegal operations launch. Article 6 compliance carbon programme active with sovereign buyer.
Buying carbon? Let's talk.
For compliance buyers, DFIs, and sovereign programmes.