Living record · 20 entries
Database
Methods you can build. Filter by pillar, scale and effort — or search the full record.
5 records
Kitchen-scale biogas digester
A sealed vessel that turns food scraps and manure into cooking gas and a liquid fertilizer, closing a loop that most kitchens send to a landfill.
Rocket mass heater
A high-efficiency wood burner whose exhaust is run through a cob or masonry bench, so a small stick-fire heats a room for hours after it is out.
Neighborhood DC microgrid
A handful of roofs, a shared battery, and a simple agreement — enough to keep lights, radios and a well pump alive when the utility is not.
Passive solar greenhouse
A glazed room aimed at winter sun, with mass inside and insulation behind, so plants and people take heat from the building instead of a burner.
Thermosiphon solar hot water
Collectors below a tank, no pump, no controller — water that rises because it is hot, and a household that still washes when the grid is quiet.