Frequently asked questions

What is CO2eq/Kwh and what does it mean?

Nowtricity uses the life cycle CO2 equivalent to define each energy source global warming potencial. These have been defined in the IPCC 2014 and take into account infrastructure and supply chain emissions. The report is available in this PDF. For waste emissions a average is used based on data available in this report.

Energy production not defined (Other) can be anything from trash incineration, co-generation to sewage gas burning. Waste emissions are assumed in that case.

Energy sourceRenewableEmissions
Biomass230 g CO2eq/kWh
Geothermal38 g CO2eq/kWh
Hydro24 g CO2eq/kWh
Hydro Storage24 g CO2eq/kWh
Ocean17 g CO2eq/kWh
Solar48 g CO2eq/kWh
Wind11 g CO2eq/kWh
Wind (Offshore)12 g CO2eq/kWh
Coal820 g CO2eq/kWh
Coal (Lignite)910 g CO2eq/kWh
Gas490 g CO2eq/kWh
Nuclear12 g CO2eq/kWh
Oil778 g CO2eq/kWh
Other580 g CO2eq/kWh
Waste580 g CO2eq/kWh

This means that clean renewable sources of energy have emissions simply because of manufacturing and maintenance emissions, but their direct emissions are actually zero.

Why does Solar and Wind have emissions?

Since CO2eq/Kwh is used, it takes into account the manufacturing and installation emissions. This means that Wind has an emission value of 11g CO2eq/Kwh and Solar 48g CO2eq/Kwh, but their direct emissions are actually zero.

Why is Hydro Storage shown separated from Hydro?

Hydro aggregates run of the river and reservoir dams. The emissions are the same for Hydro Storage but it makes sense to show it separately. One of the arguments against renewable energy is that we won't have enough electricity to power our homes or electric cars when there's no sun or wind.

Hydro storage acts as a huge battery, pumping water from one reservoir to the other producing energy when other renewable sources are low, and does the opposite at night or whenever the renewable energy production (usually wind or solar) is high, saving that energy for later.

Check these videos on YouTube by Tom Scott and Practical Engineering to learn more about hydro pumped storage.

What is the energy forecast and how can I use it?

In some countries the local grid data can include the forecast for Wind and Solar production in the next hours. Nowtricity uses that data when available and shows you the current solar and wind production and the forecast for the next hours. If the value is higher you can save on emissions by using your electric appliances later, of in the opposite case, plugging in now to save on emissions.