Sustainable energie in Iceland

Natural hydro- and geothermal resources have made Iceland the world’s largest green energy producer in the world. 323.002 Iclanders are supplied currently with renewable heat and electricity for more than 85 percent. Approximatelly 87% of all buildings in Iceland are heated nowadays with geothermal sources. And about 99,9 % of the electricity comes from the sustainable sources, three-fourths from hydro power and the last quarter comes from geothermal power stations. Only vanishingly 0.1% come from fossil fuels.

The by far largest Hydroelectric power stations such as Kárahnjúkar Hydropower Plant produces 690 MW for the aluminium industry. In comparison the German nuclear power station Isar 2 produces 1410 MW. The largest geothermal power stations Hellisheiði returns 303 MW, other smaller units such as Krafla give 60 MW per year.

Dry steam power stations are the easiest and oldest type of steam energy production. This type needs at least 150 °C or more to turn turbines. Flash steam power stations have a high-pressure hot water primary fluid and a low-pressure secondary fluid with tanks powering the flashed steam drives turbines. This is the most common type with fluid temperatures of more than 180 °C.

The binary cycle power stations flow with a fluid with much lower boiling point than water in the secondary fluid. The flash vaporizes and drives the turbines with fluid temp of only 57 degree or little more.

Near the Blue Lagoon CarbFix is injecting carbon monoxide into the rock activating following reaction: CaO + CO2 → CaCO3 MgO + CO2 → MgCO3 example reaction in basalt: Mg2SiO4 + 2CO2 → 2MgCO3 + SiO2

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