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Low GHG Emitting Safe Drinking Water Production Systems

Low greenhouse gas emitting safe drinking water production systems

ACR is accepting public comments on the methodology Low greenhouse gas emitting safe drinking water production systems, which is based on the CDM-approved methodology for small-scale project activities AMS III.AV, Version 04.0.

Per the ACR Standard, ACR accepts CDM-approved methodologies when used without modification. When project proponents wish to propose modifications to an existing methodology, ACR requires an approval process either via ACR’s regular public consultation and scientific peer review process in the case of significant modifications, or by an independent ACR AFOLU Technical Committee in cases where the proposed modifications are minor.

AMS III.AV Version 01-ACR

Summary of the methodology modification, approved July 2013:

The modification results from an analogous modification to CDM methodology AMS II.G, Energy Efficiency Measures in Thermal Applications of Non-Renewable Biomass, approved by the ACR AFOLU Technical Committee and published in July 2013.

In that modification, the fossil fuel emission factors used in AMS II.G to calculate baseline emissions are based on an assumed shift from non-renewable biomass to fossil fuels. These were replaced by biomass emission factors for fuelwood and charcoal. The rationale was that households in many developing countries where this methodology may be applied are using fuelwood/charcoal in the baseline, and when they install an efficient cookstove they still use fuelwood/charcoal but less of it, rather than switching to fossil fuels. This leads to a reduction in use of and emissions from non-renewable biomass.

To recognize this, ACR replaced the fossil fuel emission factors in Equation (1) of AMS II.G with appropriate and conservative biomass emission factors for fuelwood and charcoal, derived from the 2006 IPCC Guidelines for National Greenhouse Gas Inventories.

AMS III.AV makes the assumption that households shift to fossil fuels to provide safe drinking water, and references the calculation procedure in AMS I.E which uses fossil fuel emission factors. Since ACR has now modified AMS I.E to replace these with biomass emission factors, corresponding revisions are made to AMS III.AV. These modifications resulted in AMS III.AV Version 01-ACR, with changes shown in green text.

Please submit comments between April 15, 2014 and May 14, 2014 to


Process documentation: