Impact & certifications
Measured outcomes, independent verification
We publish our impact the way we would want to read it: with numbers, and with the names of the evaluators who verified them.
What changes for our customers
Income up, spoilage down, families better fed
Sources: 60 Decibels customer survey (2025), Samavit PayGo pilot assessment (2025) and IDCG endline evaluation (Efficiency for Access R&D Fund, public); the carbon and women-customer figures are company data.
Independent impact assessments
Four external evaluations of our work
Available in full on request.
Impact Performance Report
Phone interviews with 206 DDSolar fridge customers across India, sponsored by Acumen. 94% use the fridge for income generation, 86% report higher earnings, 85% spend less on energy each week, and 88% say their quality of life improved. NPS 44.
PayGo Solar Refrigeration Pilot
Assessment of the Efficiency for Access-funded PayGo pilot across 43 micro-enterprises in Uttar Pradesh and Maharashtra, rated 4.47/5 on OECD-DAC criteria. Average monthly revenue rose by ₹9,712 and profit by ₹5,962; redesigned fridges cut energy use by up to 74%.
Sindhudurg Fisheries Endline Study
A year-long study of 51 fishing micro-entrepreneurs in coastal Maharashtra under the DOEN-Villgro programme. Average monthly incomes rose from ₹13,420 to ₹17,755, weekly ice costs fell 66%, and 94% reported electricity savings.
EforA R&D Fund Endline Evaluation
Evaluation of 60 refrigerators with 33 customers across Odisha, Tamil Nadu, Rajasthan, Karnataka and Maharashtra; three-quarters of respondents were women. Half reported monthly income gains of ₹2,000 to 5,000, with average electricity savings of about ₹850 a month.
Intellectual property
Three granted Indian patents
Filed 2024, all granted, 20-year terms running to 2044. Together they make a financed rural appliance a recoverable asset.
572023 · PayGo refrigerator
Open-token pay-as-you-go control, Angaza-compatible. Enables lease models and puts receivables on lender books.
575561 · IoT DC refrigerator
Fleet-wide remote monitoring: collections intelligence for lenders, uptime proof for institutional buyers.
593480 · Tamper-proof storage
Hardware-level security on the battery bank: what turns a financed fridge into an asset a lender can actually recover.
A US application (19/051,211) is under examination at the USPTO. Devidayal Solar Solutions® is a registered trademark (5969066, Class 11).
Tested, listed, registered
Certified for the institutions that buy from us
Who works with us
Partners, evaluators and funders
SELCO Foundation
Impact studies; DRE livelihoods ecosystem partner.
Villgro / Powering Livelihoods
Backed under the CEEW-Villgro programme.
CLASP / Efficiency for Access
Global LEAP affordability prize; R&D Fund grantee.
60 Decibels
Independent customer-voice survey.
Funders: Sustain Plus, WE4F, DOEN Foundation, Rajeevika, Gender Catalytic Fund
UN Sustainable Development Goals
Where our work lands
No poverty
Gender equality
Affordable and clean energy
Decent work and economic growth
Climate action
Request our impact reports
The full 60 Decibels, Samavit and IDCG reports are available to programme officers, funders and lenders on request.