REDGAS: A RANDOMIZED EVALUATION OF THE DEMAND FOR LPG STOVES AND OF THE ASSOCIATED EFFECTS ON HOUSEHOLD AIR POLLUTION, GREENHOUSE GAS EMISSIONS AND WELL-BEING IN BURKINA FASO

Last registered on December 01, 2021

Pre-Trial

Trial Information

General Information

Title
REDGAS: A RANDOMIZED EVALUATION OF THE DEMAND FOR LPG STOVES AND OF THE ASSOCIATED EFFECTS ON HOUSEHOLD AIR POLLUTION, GREENHOUSE GAS EMISSIONS AND WELL-BEING IN BURKINA FASO
RCT ID
AEARCTR-0005024
Initial registration date
November 12, 2019
Last updated
December 01, 2021, 4:14 AM EST

Locations

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Primary Investigator

Affiliation
Paris-Dauphine University

Other Primary Investigator(s)

PI Affiliation
Paris-Dauphine University
PI Affiliation
Microfinance Solidaire & Paris-Dauphine University

Additional Trial Information

Status
On going
Start date
2019-11-21
End date
2023-03-31
Secondary IDs
Prior work
This trial is based on or builds upon one or more prior RCTs.
Abstract
Recent epidemiologic studies have shown that household air pollution from cooking on inefficient biomass stoves is a major public health concern which causes between 2.8 and 4.2 million premature deaths every year (WHO 2014). LPG is one of the cleanest burning cooking fuels and has been shown to have a low climate impact throughout its life cycle. This research project aims to quantify the health and socioeconomic impacts of access to LPG for low income households in developing countries. It will be implemented in partnership with NGO Entrepreneurs du Monde (EdM) in a country where it is currently conducting a LPG promotion program.

A randomized controlled experiment will be conducted in 2022. It will involve a random sample of 823 households who will be assigned to one of four groups of equal size:
1 A ‘subsidy group’ in which households will be offered a 25% discount on the purchase of a LPG kit including a stove and a 6kg cylinder;
2. A ‘credit group’ : the households assigned to this group will receive a sales offer enabling them to purchase the same kit in four installments (but at the standard market price);
3. A 'credit + subsidy group' in which households will receive a sales offer enabling them to purchase the LPG kit in four installments at a subsidized price (-25%)
4. A ‘comparison group’ where households will be offered to purchase the LPG kit in cash at the standard retail price.

In each of the four groups, half of the households will also have the opportunity to purchase a second 6kg cylinder in cash or in four installments.

The research team will collect a combination of standard self-declared survey data and field measurements both before the intervention and after the intervention (6 to 10 months after the intervention). Electronic Stove Usage Monitoring Systems (SUMS) will be installed on LPG stoves to record their usage frequency during the whole study. Individual exposure to PM2.5 will be measured with ambiant air pumps and ‘light scattering sensors’ (24h gravimetric measurement) at baseline, midline and endline. The Kitchen Performance Test (KPT) Protocol will be used to assess the fuel consumption of the households over 24 hours to 3 days.

The collected data will allow to answer numerous questions concerning the determinants of LPG adoption (household characteristics, budget constraint, information available to the household) and its impact on health (exposure to indoor air pollution) and time use (women and children).
External Link(s)

Registration Citation

Citation
De Vreyer, Philippe, Elodie Djemaï and Thomas Thivillon. 2021. "REDGAS: A RANDOMIZED EVALUATION OF THE DEMAND FOR LPG STOVES AND OF THE ASSOCIATED EFFECTS ON HOUSEHOLD AIR POLLUTION, GREENHOUSE GAS EMISSIONS AND WELL-BEING IN BURKINA FASO." AEA RCT Registry. December 01. https://doi.org/10.1257/rct.5024-2.0
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Experimental Details

Interventions

Intervention(s)
The project aims at identifying, first, what determines the household choice of fuel for cooking and the kind of incentive that may be effective to induce the household to change for a clean cooking solution, and second, the impact of adopting LPG as a cooking solution on exposure to particulate matter (PM2.5), as well as on women's and children's time use.
Intervention Start Date
2019-11-21
Intervention End Date
2023-03-31

Primary Outcomes

Primary Outcomes (end points)
- Determinants of LPG adoption and usage (household characteristics, credit constraint, knowledge about health benefits of LPG usage)
- Household and environmental determinants of air pollution exposure
- Household consumption of various fuels (wood, charcoal, kerozene, gas etc.)
- Time use (women and children)
- Self reported health
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
- COVID19 infection
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
A randomized controlled experiment will be conducted in 2022. It will involve a random sample of 823 households who will be assigned to one of four groups of equal size:

1 A ‘subsidy group’ in which households will be offered a 25% discount on the purchase of a LPG kit including a stove and a 6kg cylinder;
2. A ‘credit group’ : the households assigned to this group will receive a sales offer enabling them to purchase the same kit in four installments (but at the standard market price);
3. A 'credit + subsidy group' in which households will receive a sales offer enabling them to purchase the LPG kit in four installments at a subsidized price (-25%)
4. A ‘comparison group’ where households will be offered to purchase the LPG kit in cash at the standard retail price.

In each of the four groups, half of the households will also have the opportunity to purchase a second 6kg cylinder in cash or in four installments.

The research team will collect a combination of standard self-declared survey data and field measurements both before the intervention and after the intervention (6 to 10 months after the intervention). Electronic Stove Usage Monitoring Systems (SUMS) will be installed on LPG stoves to record their usage frequency during the whole study. Individual exposure to PM2.5 will be measured with ambiant air pumps and ‘light scattering sensors’ (24h gravimetric measurement) at baseline, midline and endline. The Kitchen Performance Test (KPT) Protocol will be used to assess the fuel consumption of the households over 24 hours to 3 days.
Experimental Design Details
Not available
Randomization Method
Sampled households are randomly selected in three towns. First, the coordinates of "GPS search starting points" are randomly selected by the scientific investigators using a GIS. Once on the field the surveyors have to find the search points and then to follow a procedure to select a household to interview, then to check his eligibility and to obtain his consent to take part to the survey.

In each town we use the map of census districts to identify the limits of the city. From the most recent satellite images we then delimit the urban area of high population density as peripheral census districts often include large areas with no of very few dwellings. The resulting areas is then split between 56 "cells" of identical surface. Within each cell a fixed number of households is drawn from the population of households that are located at least 100 meters from the cell's frontier. This way "blocks" of households are spaced from each other by at least 200 meters.
Randomization Unit
The randomization will be at the household level.
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
NA
Sample size: planned number of observations
823
Sample size (or number of clusters) by treatment arms
102 households receive an offer to buy the LPG stove at the retail price
103 households receive an offer to buy the LPG stove at a discounted (25%) price
103 households receive an offer to buy the LPG stove at credit (four installments)
103 households receive an offer to buy the LPG stove at credit (four installments) at a discounted (25%) price

103 households receive an offer to buy the LPG stove at the retail price and a second 6kg cylinder
103 households receive an offer to buy the LPG stove at a discounted (25%) price and a second 6kg cylinder
103 households receive an offer to buy the LPG stove at credit (four installments) and a second 6kg cylinder
103 households receive an offer to buy the LPG stove at credit (four installments) at a discounted (25%) price and a second 6kg cylinder
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB

Institutional Review Boards (IRBs)

IRB Name
Comité Consultatif Ethique pour la Recherche en Partenariat
IRB Approval Date
2019-06-24
IRB Approval Number
N/A
IRB Name
International Review Board, Paris School of Economics
IRB Approval Date
2019-04-11
IRB Approval Number
N/A
IRB Name
Comité d'Ethique pour la Recherche en Santé, Ministère de la Santé du Burkina Faso
IRB Approval Date
2019-04-03
IRB Approval Number
2019-04-053