Economic potential of flexible balloon biogas digester among smallholder farmers: A case study from Uganda

Moris Kabyanga, Bedru B. Balana (Corresponding Author), Johnny Mugisha, Peter N. Walekhwa, Jo Smith, Klaus Glenk

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)
18 Downloads (Pure)


Abstract Biogas technology, as a pro-poor renewable energy source, has been promoted in Uganda since the 1980s by the government and NGOs. However, many of the biogas designs promoted have proved to be too expensive for the average Ugandan to afford. A cheaper flexible balloon digester has been proposed, but there have been lack of evidence on the economic viability of this design. The purpose of this study was to analyze the economic potential of a flexible balloon digester among smallholder farmers in Uganda using the tool of cost-benefit analysis. Primary data were obtained from survey of experimental households and 144 non-biogas households in central Uganda. The results revealed that the net present value was negative and the payback period was greater than the economic life of the digester. However, sensitivity analysis revealed that with a 50% reduction in investment cost the technology is financially viable for 67% of the households and to all households as a group (NPV= UGX5,804,730). The initial investment cost is a critical factor to economic viability and potential technology adoption. We suggest that government and development partners interested in the sector should consider strategies that could reduce the technology cost, for example, by manufacturing low cost balloon digester locally instead of importing prefabricated digesters.
Original languageEnglish
Pages (from-to)392-400
Number of pages9
JournalRenewable Energy
Early online date29 Dec 2017
Publication statusPublished - May 2018

Bibliographical note

This work was supported by the UK DFID grant on ‘The New and Emerging Technologies Research Competition (NET-RC) initiative (Grant No. DFID NET-RC A06502). We gratefully acknowledge the financial support from DFID. We also extend our thanks to the households participated in the survey. The views expressed in this paper are those of the authors and do not necessarily reflect those of DFID or the affiliated organizations. Our final thanks go to the two anonymousreviewers for their invaluable and critical comments that have remarkably improved the paper.


  • Biogas
  • Cost-benefit analysis
  • Economic viability
  • Flexible balloon digester
  • Uganda


Dive into the research topics of 'Economic potential of flexible balloon biogas digester among smallholder farmers: A case study from Uganda'. Together they form a unique fingerprint.

Cite this