Sustainable Household Energy Adoption in Rwanda (SHEAR)

NCT05668624 | Completed DMC

• 2 other identifiers: 2219R01ES029995
• Study Type: interventional
• Target: 1,680
• Locations: 1 country
• Sites: 1

Brief Summary

Investigators will conduct a randomized controlled trial substituting traditional forms of household energy (biomass for cooking and kerosene for lighting) with liquified petroleum gas (LPG) stoves/fuel and solar power (in areas marker for solar grids by the Government of Rwanda) in rural Rwanda. Eligible households (n=650) using traditional forms of energy will be recruited from eastern Rwanda. In each household, investigators will recruit either one adult female and one adult male or just one adult, and one child (aged 8-15 years). Following baseline health and exposure assessment, a randomized treatment arm (n=250 homes) will receive a full subsidy for LPG fuel and solar power, a control arm (n=250 homes) will continue to use traditional energy, and a random-subsidy arm (n=150 homes) will be randomized to a discounted price (at baseline and every 6-months) for solar and LPG in a pay-as-you-go (PAYG) service model (i.e., pre-pay a desired amount through mobile money). The random subsidy arm will then decide whether or not to cook with the discounted LPG or their traditional stove. Participants will be followed for 3 years with repeated measures of household air pollution (HAP) exposure (48-hour fine particulate matter (PM2.5) and black carbon (BC)), energy use, health, and preferences. Primary health endpoints include blood pressure (BP) in adults and lung-function growth in children; secondary endpoints include BP in children and lung-function change in adults. To complement the trial, the random-subsidy arm will generate policy-relevant information on causal relationships between energy costs, solar and LPG usage, and HAP exposures. The investigators propose 3 aims: Aim 1. In an ITT framework, investigators will evaluate the effect of a household energy intervention on exposure to HAP and indicators of morbidity separately among Rwandan women, men, and children within n=500 households. Aim 2. Using exposure-response modeling, investigators will characterize associations between exposure to HAP and indicators of morbidity separately among Rwandan women, men, and children within n=650 households (500 trial households + 150 random subsidy households). Aim 3. Using a random-encouragement design, investigators will investigate causal relationships between randomized energy costs, measured energy usage, and estimated exposure to HAP among n=400 households (150 random subsidy households + 250 full subsidy treatment arm households).

Conditions

Blood Pressure; Lung Function

Outcome Measures

Primary Outcomes (3)

• Change in systolic blood pressure (adults)

  Blood pressure will be measured approx. every 6 months for the 3-year follow-up period

• Spirometry (children): FEV1 trajectory

  Spirometry will be measured approx. every 6 months for the 3-year follow-up period

• Spirometry (children): FVC trajectory

  Spirometry will be measured approx. every 6 months for the 3-year follow-up period

Secondary Outcomes (11)

• Change in systolic blood pressure (children)

  Blood pressure will be measured approx. every 6 months for the 3-year follow-up period

• Change in diastolic blood pressure (children)

  Blood pressure will be measured approx. every 6 months for the 3-year follow-up period

• Spirometry (children): FEV1/FVC trajectory

  Spirometry will be measured approx. every 6 months for the 3-year follow-up period

• Spirometry (children): FEF25-75 trajectory

  Spirometry will be measured approx. every 6 months for the 3-year follow-up period

• Spirometry (children): PEF trajectory

  Spirometry will be measured approx. every 6 months for the 3-year follow-up period

Study Arms (3)

Full Subsidy Arm

EXPERIMENTAL

This arm receives free LPG and stove for cooking following the baseline measures, for the duration of the 3-year follow-up period. For those households in Government of Rwanda designated areas for solar microgrids, this arm will also be connected to and provided free access to solar electricity for lighting.

Other: Clean household energy

Control Arm

NO INTERVENTION

This arm will remain using traditional forms of energy for cooking and lighting.

Discount Subsidy Arm

EXPERIMENTAL

This arm will be randomized to a discounted price (at baseline and every 6-months during the 3-year study) for solar electricity (in areas marker for solar grids by the Government of Rwanda) and LPG gas in a pay-as-you-go (PAYG) service model (i.e., pre-pay an affordable amount through mobile money, a common form of currency transactions in Rwanda). For example, this arm will be asked to cook as normal and decide whether or not to cook with the discounted LPG or their traditional stove (i.e., they will not be required to pay for LPG).

Other: Clean household energy

Interventions

Clean household energy OTHER

LPG stoves/fuel for cooking and solar electricity for lighting

Discount Subsidy Arm; Full Subsidy Arm

Eligibility Criteria

• Age: 8 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

You may qualify if:

• This research will recruit and enroll 650 households (250 households in the full subsidy arm; 250 households in the control arm; 150 households in the discount subsidy arm).
• Home resides in the study area of Isangano and Karambi
• Uses biomass as primary cooking fuel
• Either both an adult male (at least 18 years old) and female (at least 18 years old), or just one adult (at least 18 years old), head(s) of household willing to consent and at least one child between 8 and 15 years of age willing to assent; We will recruit the younger child in families with more than one child between 8-15 years of age. We will also confirm the child is living at home throughout the year and not attending boarding school elsewhere.
• No commercial cooking
• No smoking in the household
• Not planning to move in 3-year timeframe
• Not currently pregnant (females); Note: If the female becomes pregnant during the study she will not be able to participate in any visits that occur during her pregnancy but she will be able to participate after she has given birth. However, if there is another adult in the household then this will not preclude the other two people (i.e., the other adult and the child) from continuing to participate throughout that time.

You may not qualify if:

• Home resides outside the study area
• Uses clean fuel as primary cooking fuel
• Participants outside the age ranges: Adult male (at least 18 years old) and female (at least 18 years old) heads of household willing to consent and at least one child between 8 and 15 years of age willing to assent
• Conducts commercial cooking
• Smoking members of the household
• Planning to move in 3-year timeframe
• Currently pregnant (females)

Sponsors & Collaborators

• Colorado State University: lead
• National Institute of Environmental Health Sciences (NIEHS): collaborator

Study Sites (1)

Field site in Rwanda (Isangano and Karambi)

Ndego, Eastern Province, 80521, Rwanda

Location

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: PREVENTION
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: December 7, 2022
• First Posted: December 30, 2022
• Study Start: November 17, 2022
• Primary Completion: August 22, 2025
• Study Completion: August 22, 2025
• Last Updated: January 15, 2026

Record last verified: 2026-01

Locations

RW (1)