CO2 calculator Energy balance calculator

Since there is not a single footprint calculator where you can enter the values of a GEMINI next generation, here is our CO2 energy balance calculator for housing and mobility.

CO2 calculator Energy balance calculator
Since there is not a single footprint calculator where you can enter the values of a GEMINI next generation, here is our CO2 energy balance calculator for housing and mobility.

  Download CO2-Calculator PDF


00:34 GEMINI next generation house and electric car.
01:02 Electricity demand 7,000 kWh, electricity generation 33,000 kWh
02:08 Heat is included in electricity demand
02:42 Default value for water
02:50 Diet with little meat
02:58 Large electric car 24,000 km per year
03:13 No travel
03:19 Consumption
03:43 Very little paper waste
03:54 Household appliances
04:04 Consumer electronics
04:14 Pets
04:16 Shocking result 13.95 t CO2/a
06:38 Optimization no more solar power
07:00 Surprise, only 13.61 t CO2/a left
07:14 Optimization only 2,800 kWh electricity left
07:30 because diesel car instead of electric car
07:44 14,57 t CO2/a without solar power with diesel car
09:06 Energy balance calculator instead of CO2 calculator
10:16 6 kWh electricity, to recycle 1 kg CO2 from the atmosphere
11:17 50% of CO2 emission when burning wood is calculated
12:49 House around 1970, diesel car 20.000 km per year
14:20 Extensive thermal renovation, 60% less heat demand
14:59 Oil heating out, heat pump in
15:38 Diesel car gone, electric car here
16:16 10 kW photovoltaics on south roof
17:21 GEMINI next generation house with electric car
19:00 Planetary renovation back to 350 ppm CO2
19:38 End

Music: Andy Mangele

  We do not have 37 million km² of growing forest


Footprint calculators assume that 1 m² of growing forest can absorb 1 kg CO2 per year. This would work very well with 1 to 2 billion tons of CO2 emissions per year. Creating 1 to 2 million km² of new forest would not be a feat.

But one thing is certain: we do not have 37 million km² for new forest areas. This fact is expressed with the saying "We need 2 Earths". Since we don't have 2 Earths, we need a more efficient method to reduce CO2. Filtering one kg of CO2 from the atmosphere and splitting it into carbon and oxygen requires 6 kWh of electricity. A square meter of photovoltaic can produce 360 kWh per year in a sunny desert and thus supply a facility with electricity that reduces 60 kg of CO2 with these 360 kWh. Instead of 37 million km² growing forest around 0.6 million km² photovoltaic in sunny deserts. We have them, that is feasible.

  Energy balance calculator


Our energy balance calculator evaluates every kWh of electricity you feed into the grid as 1 kWh positive in your balance and every kg of CO2 emission as 6 kWh negative.

The values come from Calculation of greenhouse gas (GHG) emissions from various energy sources Federal Environment Agency Austria as of 2019. The upstream chain is taken into account at the Federal Environment Agency Austria. For example, from the borehole via transport to the refinery and to the filling station. There are also information on air travel and other emissions.

Deviating from this, the CO2 default for electricity is 420 g/kWh according to Umweltbundesamt Deutschland 2021

Deviating from this, we do not believe that a tree that would stand for 300 years is CO2 neutral, we therefore calculate 50% of the carbon present in the wood for burning.

The preset values correspond to a GEMINI next Generation house between 47 and 50 degrees latitude with 33 kW peak photovoltaic, additional 10 kW photovoltaic on the garage and 20,000 km per year driving an electric car.

Electricity purchasing kWh
Electricity mix g CO2/kWh
Electricity feed-in kWh
Heating oil Liter
Diesel Liter
Gasoline Liter
Natural gas (10 kWh/m³ 13 kWh/kg) kWh
Wood kg
Other CO2 emissions kg
Your energy balance in electricity 2000 kWh

  Electricity purchasing


The electricity that you draw from the mains, the electricity that you charge your car with at charging points.

  Electricity mix


Use the electricity mix of your country for this, even if you purchase "100% certified green electricity". This is useless as long as your neighbour has "100% electricity from local lignite".

A snapshot of the power mix can be found on ElectricityMap.org.

  Own consumption


This point simply does not exist in the energy balance. If you consume a lot of your solar power yourself, this will only reduce your electricity sales.

  CO2 Emission from production


CO2 emissions from production are constantly changing. The electricity mix becomes cleaner, the production is energetically optimized. But this can also go in the opposite direction. Oil wells that are easy to use are diminishing, new oil wells can only be tapped at extremely high cost. German coal mines close, coal is sourced by ship from other continents.

Let's assume that a GEMINI next Generation is transported 200 km from the production hall to the building site. For the way to the ground 15 l diesel/100 km, for the way back 7 l diesel/100 km. 264 liters of diesel for house transport. In a few years Electric cars will be available, which can also pull a house segment . For the way to the building site 55 kWh/100 km, for the way back 25 kWh/100 km. That is 960 kWh electricity, the largest part of the photovoltaic roof of the production hall.

  Only a snapshot of housing and mobility


Production is not included in this calculation. It does not include emissions from food production. A balance in red shows how many kWh of electricity future generations will have to produce during the period of planetary renovation to filter your CO2 emissions from the atmosphere and split them into carbon and oxygen.

It also does not take into account the possible interest on our greenhouse gas emissions, thawing permafrost soils, outgassing methane hydrate. Perhaps every kg of CO2 from fossil combustion is accompanied by one kg of CO2 equivalent from thawing permafrost soils.

GEMINI next Generation - energy + food + living comfort GEMINI next Generation - energy + food + living comfort
What can housing cost? Where can you build? How much Energy should a house produce? How much building material is needed? GEMINI n.G. is looking for completely new answers to these questions.


Prehistory of the GEMINI next Generation project
It started in autumn 1991 with the GEMINI habitable solar power plant, 2011 with the initiative Solar Building Land and 2018 with GEMINI 66 - we build our house ourselves.


Where can and should GEMINI next Generation be built? Where can and should GEMINI next Generation be built?
Using existing land better and building where conventional houses cannot or are not allowed is an important objective of the GEMINI next Generation project.


How much energy should a house generate? How much energy should a house generate?
As much as possible! Because we need to get out of oil, coal, biofuel, natural gas and uranium. Our houses should contribute as much as possible.


Project GEMINI next Generation 2019 Project GEMINI next Generation 2019
Security, Production hall near Bleiburg, Study Jordan, Flyer for lectures 2020, Cyclist vs commuter, Press release December,



Project GEMINI next Generation 2020 Project GEMINI next Generation 2020
ORF Salzburg, Lecture, , No. thanks!, Food, Electricity Distribution 2.0, RE unleashed, From the factory,



Project GEMINI next Generation 2021
*, Rethinking cities, *, Rethinking energy transition, Summer/Winter, Energy Social Food transition, *, Material test, 100% solar?, Ventilation system, Heat pump, Disruption, Optic,



Project GEMINI next Generation 2022
Housing counseling, Cheaper than rental apartment,





  How much energy should a house generate?


As much as possible! Because we need to get out of oil, coal, biofuel, natural gas and uranium. Our houses should contribute as much as possible.

Climate protection superiority house Climate protection superiority house
Start into the solar age with a Climate protection superiority house. Lowest possible energy consumption for production, maximum possible energy surplus during operation.


Photovoltaics replace almost everything
We have to get out of oil, coal, biofuel, natural gas and uranium. Photovoltaics must bear the brunt of this exit. No more ridiculous fig leaf PV systems.


Energy for room heating becomes insignificant Energy for room heating becomes insignificant
How much do you save when you freeze in your own house? Between 18 and 23 degrees interior temperature are only 1000 kWh heat, less than 250 kWh electricity, less than 20 EUR.