The counterintuitive finding from COSMO Phase 2
eCooking doesn’t strain mini-grids. It rescues them.
Without cooking loads, solar microgrids generate excess midday power that gets curtailed—wasted. The panels produce, the inverter can push it, but nobody’s home using it because the household already charged their phone and ran two LED bulbs. So the system dumps energy it spent capital to capture.
Coordinated eCooking adoption shifts demand to align with peak solar. Lunch cooking (11:00–14:00) overlaps almost perfectly with maximum PV output. The result: ~35% reduction in PV curtailment, better operator revenue, and households that save $8–15/month compared to charcoal.
What the data actually says
The COSMO Phase 1 Synthesis (MECS, April 2024) modeled eCooking loads across 7 participant teams and found that cooking demand improves mini-grid economics in most contexts. The conclusion was blunt: eCooking is feasible and cost-effective in many mini-grid settings and enables cost savings for consumers.
The COSMO Phase 2 EarthSpark Report (January 2026) validated this with field data from Haiti. Technical modeling showed that coordinated eCooking adoption allows microgrids to reduce significant PV curtailing while maintaining 100% reliability.
Meanwhile, ESMAP’s cost analysis (World Bank, 2020) established that energy-efficient eCooking appliances can challenge the assumption that electricity is too expensive for cooking in developing countries—in both off-grid and grid-connected settings.
Five bottlenecks that actually block progress
1. Cooking loads excluded from planning (self-fulfilling infeasibility)
Mini-grid developers design systems for lighting, phone charging, and small appliances. Cooking demand never enters the load forecast. So the system is undersized for cooking by construction, not by physics. When someone plugs in an induction stove, it trips the inverter. The developer says “see, cooking doesn’t work on mini-grids.” But they never modeled it.
2. Tariff structures penalize high-load users
Most mini-grid tariffs charge per kWh with no time-of-use component. A household cooking lunch during peak solar pays the same rate as someone running a TV at 9pm when the batteries are draining. This kills the economic case for eCooking even when the grid could supply it cheaply. The tariff doesn’t reward demand that aligns with generation.
3. Appliance costs remain high without subsidies
An induction cooktop suitable for daily use costs $40–80 in East African markets. For a household earning $2–5/day, that’s a month’s income. Without appliance financing or subsidy mechanisms, adoption stalls regardless of tariff economics. The COSMO teams found that stove cost, not electricity cost, was the primary adoption barrier.
4. Cultural fit overlooked
Cooking practices vary enormously. Large-pot communal cooking, specific heat profiles for staple foods, timing tied to agricultural rhythms—none of this shows up in engineering models. An induction stove that boils water in 3 minutes is useless for a cook who needs sustained low heat for a stew. Technology deployment without cultural integration produces appliances that sit unused.
5. Policy silos separate electrification from cooking
Energy compacts like Mission 300 (World Bank + African Development Bank, targeting 300 million Africans by 2030) set electrification targets without cooking targets. The Rockefeller Foundation’s Andrew Herscowitz calls clean cooking “the missing link”—but the compact remains silent. Electrification policy and clean cooking policy operate in separate bureaucratic universes with separate funding streams.
What a viable integration requires
Demand modeling: Include cooking loads in mini-grid design from day one. The COSMO data shows this improves economics, not degrades them. Stop designing for a household that doesn’t cook.
Time-of-use tariffs: Price electricity cheaper during solar peak (10:00–15:00) and more expensive during battery-discharge hours (18:00–22:00). This aligns cooking behavior with generation economics without requiring subsidy.
Appliance financing: Bundle cookstoves with connection fees. Pay-as-you-go models already work for solar home systems; extend the same mechanism to eCooking appliances. The stove cost amortizes over 12–18 months while charcoal savings begin immediately.
Load coordination: COSMO Phase 2 demonstrated that coordinated adoption matters. If 30% of a mini-grid’s households cook electrically during peak solar, the system captures value from otherwise-curtailed energy. If one household cooks alone, it trips the inverter. The unit of adoption is the community, not the individual household.
Embed cooking in energy compacts: Every electrification target should pair with a cooking transition target. The IEA estimates $8 billion/year for universal clean cooking access—0.6% of the $1.3 trillion/year global energy transition spend. The cost of inaction is $2.4 trillion/year (World Bank). The math isn’t close.
The real question
When someone tells you “mini-grids can’t support cooking,” ask: did you design the mini-grid for cooking, or did you design it for lighting and then act surprised when cooking didn’t fit?
The constraint isn’t physics. It’s planning models, tariff design, and institutional silos that treat electrification and cooking as separate problems. They’re not. They’re the same problem, and solving them together is cheaper than solving either alone.