~ 4-5 million tons of coal (33 TWh in 2009)

- Equals ~1/3rd of Bitcoin's energy consumption (~115 TWh per year, 2022) [6]

- A pile of 8 million tons of coal is ~1/2km (~1/3 mile) in diameter and 167m (549ft) high [3]

- Poland uses 10 million tons of coal a year to heat households (2017) [4]

- Annual world coal production 7,741.6 million t (2020) [5]

33bn kWh [0] = 4.056.268 TCE (Ton Of Coal Equivalent) [1]

33bn kWh / 6.7 kWh/kg [2] / 1.000 kg/t = 4.925.373 t

[0] https://www.theguardian.com/technology/2009/apr/15/spam-mcaf...

[1] https://www.justintools.com/unit-conversion/energy.php?k1=te...

[2] https://en.wikipedia.org/wiki/Coal

[3] https://www.sightline.org/2013/07/03/what-8-million-tons-of-...

[4] https://www.dw.com/en/coal-rich-poland-faces-winter-of-energ... -> https://www.dw.com/en/can-poland-end-its-toxic-relationship-...

[5] https://en.wikipedia.org/wiki/List_of_countries_by_coal_prod...

[6] https://www.statista.com/statistics/881472/worldwide-bitcoin...