The Solar Lantern Project

Engineering, Product Design, User Research
Project Overview
Over 1 billion people lack reliable access to electricity. Another 2 billion people rely on biomass or kerosene for cooking, lighting, and heating.

From 2009-2011, I made repeated visits to a community in central Kenya in order to learn about the effects of energy poverty and investigate the different factors that affect the adoption of renewable energy technologies that are able to provide electricity to corners of the world where power lines simply do not reach.
My Role
I conducted this independent research project in partnership with Princeton University's School of Public and International Affairs (fka. Woodrow Wilson School of Public Policy), and in fulfillment of a Science, Technology and Environmental Policy certificate for my PhD thesis.

I was advised by Prof. Wole Soboyejo (primary thesis advisor), Prof. Michael Oppenheimer, and Prof. Jennifer Widner. Throughout the project, we also received tremendous assistance and support from our partners at the Mpala Research Centre and Wildlife Foundation (MRC) in Kenya. Our translators Maggie and Florence Lima were also instrumental in helping us survey the community.
STEP Case Study Cover Photo: This is a photo that I took from one of our user interviews. Our interviewer is speaking with a community member in his modest home. There are simple belongings including a work shirt, radio, and tin can in the background. The hut is built directly on a dirt floor.
The "energy poor" spend a disproportionate amount of time and money (10-30% of household income) on sub-standard cooking and lighting fuels. This has enormous consequences for society. A community without electricity cannot run computing services, refrigerate medicines, power industrial machinery, or access information from the internet.

In 2009, I visited the Laikipia Plateau of North Central Kenya while conducting research on a solar-powered vaccine transportation system. Here, we lived with a rural community of ~50 households and decided to conduct a small site assessment. We learned that residents were MRC staff members who were housed on-site with their immediate families. This made the community unique in that at least one household member had a predictable source of income.

Nevertheless, the village was still 1 hour (by car) from the nearest town. Clean drinking water was available through boreholes and purified rainwater collection. Moderate electricity was provided at the research center through generators, but unavailable in the accommodation villages. In other words, these residents still faced the same fundamental resource challenges of any remote community.

Because the MRC had strong partnership with our university, we concluded that this was an ideal location for conducting a research study on solar technology in rural off-grid communities. Moreover, we could potentially use the administrative support to experiment with novel financing schemes.
Woodrow Wilson School for Public and International Affairs
(Princeton University)
PEI-STEP Fellow
Sep 2009 — Sep 2012

Full Case Study

STEP Case Study Photo 1: This is a photo that I took from one of our user interviews. Our interviewer is speaking with a community member in his modest home. There are simple belongings including a work shirt, radio, and tin can in the background. The hut is built directly on a dirt floor. The image is titled "The Solar Lantern Project" and has subtext indicating that the main themes of the project are "Off-grid Solar" and "Technology for Developing Regions".STEP Case Study Photo 2: Background on Energy Poverty.STEP Case Study Photo 3: A photo that I took of two community members sitting in a tree. You cannot see it in the photo but they are watching other community members play soccer. There is a beautiful tree-lined hill in the background.STEP Case Study Photo 4: The team.STEP Case Study Photo 5: A photo that I took of the community that I interviewed. Here you can see the typical housing structure in the community, known as bandas, that resemble huts. Each banda hosts one family. There is a man sitting on a small wall in front of the bandas. One of the bandas has a small solar panel mounted to the roof.STEP Case Study Photo 6: The User Profile.STEP Case Study Photo 7: A Google Map aerial satellite photo of the community showing the different homes that were interviewed for this project.STEP Case Study Photo 8: Details of the baseline study.STEP Case Study Photo 9: Sample questions from the user interview.STEP Case Study Photo 10: High level statistics and findings on the community demographics and energy usage habits, based on the initial baseline study.STEP Case Study Photo 11: Table of appliances and devices requiring electricity, along with a chart showing monthly income levels of the household.STEP Case Study Photo 12: High level statistics and details on typical lighting usage and behaviors.STEP Case Study Photo 13: Montage of photos that I took showing different sources of lighting and energy used in the community.STEP Case Study Photo 14: A photo that I took showing the desk setup of someone using a kerosene lantern to finish schoolwork. It is apparent that the lighting is very dim and insufficient.STEP Case Study Photo 15: The case for solar.STEP Case Study Photo 16: GIF photo composite showing the opportunity for solar. The first image shows a map of the world at night, which highlights areas of high electrification. The second image shows a map of solar irradiation, which denotes areas that get a lot of sun. By overlaying the two images together, one can see how there are many opportunities for solar energy to provide energy in areas that do not currently have high rates of electrification.STEP Case Study Photo 17: An explanation of the opportunity for solar.STEP Case Study Photo 18: A photo of the landscape in rural Kenya, not far from the community where the research study was taken. STEP Case Study Photo 19: Overview of the solar lanterns that we introduced for this study.STEP Case Study Photo 20: two side by side photos comparing the appearance and lighting intensity between the solar lantern with the traditional kerosene lantern.STEP Case Study Photo 21: A photo that I took of community members unpacking the solar lanterns, preparing for distribution to the community.STEP Case Study Photo 22: The follow up interviews.STEP Case Study Photo 23: A photo that I took of our translator interviewing another community member, during the follow up interview process.STEP Case Study Photo 24: Sample interview summary of a male shop owner in the community.STEP Case Study Photo 25: Sample interview summary of a male waiter in the community. STEP Case Study Photo 26: Sample interview summary of a male security guard in the community.STEP Case Study Photo 27: Sample interview summary of a female chef in the community.STEP Case Study Photo 28: A photo that I took of our translator interviewing a female community member. She has a pretty curtain acting as a room divider separating the sleeping and living quarters. There is a homemade tablecloth protecting the table as well.STEP Case Study Photo 29: A photo that I took of a solar lantern hanging in a common building of the community. The small solar panel is sitting on the roof to charge.STEP Case Study Photo 30: Small problems found with the lantern design.STEP Case Study Photo 31: A photo that I took of a solar lantern hanging on the wall of one of the homes. It is evident that it has been heavily used over the past year. For example, the base is clearly broken and nearly falling apart. And the wires have been repaired. But it is still working.STEP Case Study Photo 32: More details on the reliability of the solar lanterns after one year of use.STEP Case Study Photo 33: Two photos that I took showing community members repairing their lanterns. We trained three community members how to diagnose, dismantle, and reassemble the lanterns to improve their longevity and sustainability.STEP Case Study Photo 34: Details on how we started incorporating local materials into the solar lanterns so that community members could build their own lanterns from locally sourced materials.STEP Case Study Photo 35: Photos of the hybrid design combining kerosene lanterns with locally-sourced electronic parts.STEP Case Study Photo 36: Summary.

Full Case Study