- Kevin Adair
- Khan's Backpack Solar Cooker
- Khan's Solar Food Dryer
- Khan's Solar Oven
- Kiin
- Kimono Solar Cooker
- Kinarkumar Patel
- Kiosco SOLAR
- Kirk-ook
- Kivu
- Klaus Schulte
- KoZon Foundation
- Kolamba Solar Cooker
- Kota Anjaneya Sarma
- KotoSec Solar Dryer
- KotoThermosCooker
- KotoThermosCooker Scout
- Kotowski Cooker
- Kounoungou Refugee Camp
- Kundu Kaar
- Kurt Neubek
- Kuwait
- Kyoto Box
- Kyoto Energy
- Kyoto Trough
- Kyoto Twist Solar Cooking Society
- Kyrgyzstan
- Kyriakos Antoniou
- La Sazón del Sol
- Lady Fatemah Trust
- Lamin Sawo
- Las Mujeres Solares de Totogalpa
- Lazola-Initiative zur Verbreitung solaren Kochens e.V.
- Lazola 3
- Le Présage
- Leaving messages for other users
- Lebanon
- Lejofonds
- Lernen - Helfen - Leben e.V.
- Lesotho
- Lesotho Cooker
- Leéiyen
- Li-Yan Zhu
- Liberia
- Lift Up Africa
- Lighting
- Lightoven I
- Lightoven II
- Lightoven III
- Liking Energy Co., Ltd
- Linda Stein
- Lisa Rayner
- Lorena Harp
- Lorraine Anderson
- Lotan Center for Creative Ecology
- Louise Meyer
- Low-cost Tile Box Cooker
- Low-cost Wooden Solar Box Cooker
- Low-tech Lab
- Low-tech reflective material
- Luggage solar cooker
- Lumium Butterfly
- Luther Krueger
- Lytefire
- MUMA Solar Cooker
- MWAYEO KENYA
- Maarten Olthof
- Madagascar
- Madagascar news archive
- Madison Solar Engineering
- Magadi Cultural Group
- Magnar Totland
- Magnato Water Bottle Heater
- Magnum Astron
- Maize meal
- Making the Most of Sunshine
- Malaviya Solar Energy Consultancy
- Malawi
- Malawi news archive
- Malaysia
- Malcolm Gee
- Mali
- Mali news archive