Updated on December 28, 2023


Created on August 27, 2015

ACE-1 Ultra Clean Biomass Cookstove

Upcoming Update

Designed by African Clean Energy, ACE-1 is a portable cookstove that features a solar panel and ports enabling the charging of mobile phones and solar lamps.

Developed By Unknown
Tested By
  • Colorado State University: Engines and Energy Conversion Lab (EECL)
Content Partners


Product Description

Designed and distributed by African Clean Energy, ACE-1 Ultra Clean Biomass Cookstove is a smokeless, gasification stove that can burn almost any solid biomass, but is designed to work especially well with wood pellets. Video available about the features of the stove.

African Clean Energy is located in Lesotho in southern Africa.


Target SDGs

SDG 7: Affordable and Clean Energy

SDG 3: Good Health and Well-Being

Market Suggested Retail Price


Target Users (Target Impact Group)


Distributors / Implementing Organizations

African Clean Energy, with regional distributors worldwide. The organization is looking for further distributors.

Manufacturing/Building Method

Stoves are mass produced in Africa Clean Energy's factory based in Maseru, Lesotho by 60 local men and women. The Lesotho National Development Corporation has allocated a 2000m2 factory building for the production of the cookstoves.

Intellectural Property Type

Trade Secret

User Provision Model

Directly from the manufacturer by purchase online or through its international and national distributors.

Distributions to Date Status

For 2015, over 40.000 ACE-1 cookstoves have been distributed. Interview with representative Some field cases can be seen in ACE's blog.

Fuel type


Pot type


Thermal efficiency (%)


PM emissions (g/MJ delivered to pot)


CO emissions (g/MJ delivered to pot)


Time to boil (min/L)


Design Specifications

Design specifications include a solar panel, a LiFePO4-type solar-powered battery (6.4 V, 5 Ah) that powers a fan that allows complete combustion of fuel and reduces fuel emissions. It has USB and DC outputs that allow charging of mobile phones and lamps within a LED light for monitoring the charging of the system. It is lightweight as it weighs 4.6 kgs and its dimensions are (LxWxH) in cms 33 x 33 x 35.      

Product Schematics

Technical Support

Full instructions on how to use, light and charge the stove. For further support, contact the manufacturer.  

Replacement Components

Repairs and supplementary products are available through regional distributors.


This product has 1-year manufacturer warranty, however, approximate lifespan is 12 years.  

Manufacturer Specified Performance Parameters

African Clean Energy aims to meet the energy needs of off-grid families with a simple, practical, and business-based solution that reduces the negative impacts on health, environment and poverty of traditional cooking methods. This is how they came up to the ACE-1 ultra clean biomass cookstove design, that apart from cooking, it enables universal charging of mobile phones and solar lamps.    

Vetted Performance Status

Testing results for the stove are summarized and can be downloaded from the Clean Cooking Catalog.  


The room should be well ventilated, the stove should sit on a flat surface, and be kept out of reach of small children.

Complementary Technical Systems

Multiple colours available.

Academic Research and References

Majid, E., Jill C, B (2017). Household energy and health: where next for research and practice? The Lancet, Volume 389, Issue 10065, 14–20 January 2017, Pages 130-132.

Wathore, R., Mortimer, K., Grieshop, A (2017). In-Use Emissions and Estimated Impacts of Traditional, Natural- and Forced-Draft Cookstoves in Rural Malawi. Environmental Science Technology., 201751 (3), pp 1929–1938. DOI: 10.1021/acs.est.6b05557.

Jacobs, A., et al (2016). Forge: Thermoelectric Cookstove. Interdisciplinary Design Senior Theses. 18. https://scholarcommons.scu.edu/idp_senior/18

Clean Cooking Alliance – Clean Cooking Catalog: Results Report – ACE One. n.d. www.catalag.cleancookstoves.org. Global Alliance for Clean Cookstoves.

AfricanCleanEnergy. 2016. From the Archive: Intro ACE 1 – Function and Accessories. Vimeo. June 20, 2016.

Operations. n.d. African Clean Energy.

About. n.d. African Clean Energy.

Ace-One. n.d. African Clean Energy.

Stories. n.d. African Clean Energy.

Compliance with regulations

Laboratory tests grade it IWA-ISO tier 3 for emissions, tier 3 for efficiency and tier 4 for safety. This places the ACE 1 among the most efficient, clean and safe stoves in the market. All information in the Clean Cookstove Catalog. African Clean Energy is a B-certified organization.

Evaluation methods

Up to 5 tests were taken and 36 metrics measured following the GACC in the following categories: IWA emissions, efficiency, indoor emissions, efficiency, energy consumption and fuel use, safety metrics and test conditions metrics.

Other Information


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