Yellon Environmental Aesthetic Housing

YEAH is a globally unique housing project that is entirely self-sufficient in terms of energy, water, and sewage. Yellon came up with the idea for the concept and collaborated on the project with a range of expert companies within different fields.


Traditional electricity production depletes the Earth's resources, while demand for electricity continues to rise. Sweden's sewage systems and drinking water networks are undersized and outdated. Our society is vulnerable, and resources are wasted unnecessarily.


YEAH as a concept rose from the desire to make the world a better place. The idea is to construct multi-family housing that is 100% off-grid, self-sustaining in terms of energy and water while managing its own sewage. Through YEAH, urban development can continue without burdening existing networks.

Solar energy a base for power supply

The estimated annual electricity consumption is approximately 120,000 kWh. To cover the need, facades, roofs, and glazing are equipped with various types of solar cells. Electricity is stored in batteries before use. To meet winter demand, energy will be stored in hydrogen, converted to electricity and heat via a fuel cell. Vehicles may be charged with excess energy. To minimize the size of battery and hydrogen storage, energy consumption is optimized in different ways:

– Climate shell enabling less than 20 kWh/m2 and year in energy consumption for heating and hot water.
– Liquid-cooled solar cells on the roof increase efficiency, providing both electricity and heat.
– Purification and recirculation of hot water and graywater reduce energy needs by up to 80%.
– Heat recovery from the electrolysis process producing hydrogen (55°C, heats hot water in summer).
– Recovery of heat in the coolant from the fuel cell (65°C, heats hot water in winter).
– A highly efficient heat pump serves as the core of heating and hot water management.
– Seasonal storage of heat surplus in a ground heat storage called ASES.
– A hybrid of termite ventilation preheats air in winter and cools it in summer, requiring minimal fan operation.
– Toilets flushing with water warmed in a natural microbiological purification process, avoiding unnecessary heating in the flush tank.
– Demand and seasonal control of heating.
– Residents can measure and to some extent control their consumption, triggering cost-saving reflexes (lower living costs).
– For operational reliability, solar cells, charging, and power supply are sectioned to avoid power outage if any part fails or undergoes maintenance.

Water consumption is expected to decrease by up to 75%.

By collecting rainwater and meltwater from roofs and paved areas, the house’s water supply can be sustained, provided that the water is purified and reused. Drinking water comes from a private well, and kitchen wastewater is directed to the blackwater drain. The private well serves as a backup if rainwater is insufficient, and the rainwater reservoir can be reduced in size. Purification and recirculation of water are expected to reduce water consumption by up to 75%.

This is achieved through:

– Natural purification of precipitation through open stormwater management and sand filtration in a pond.
– Purification and recirculation of all household water.
– Purification and recirculation of all blackwater (in a closed loop).
– Constant digital monitoring of water quality.
– Regular sampling of drinking water and hygiene water.


RISE declares YEAH world-unique


RISE, Research Institutes of Sweden, is a research institute with a broad range of research areas. RISE’s mission is to promote sustainable growth in Sweden by strengthening the competitiveness and renewal of the business sector and contributing to innovative societal development. In collaboration with RISE, the YEAH concept has been developed, and a strong consortium has been linked to the project. RISE led the work in a feasibility study and digital simulation of the concept within the Swedish Energy Agency’s E2B2-project. The research project was conducted by RISE, Mälardalen University, Vätterhem, and Yellon, with support and input from several expert companies in various fields and demonstrated that the concept is feasible.

Find the full summary and report in Swedish here.

Attachment 1: Market Inventory
Attachment 2: Simulation
Attachment 3: Economic Differential Calculation
Attachment 4: Communication


Read more about YEAH here: