Iceland vs Slovakia: Electricity Compared

Iceland generated 18.5 TWh of electricity in 2025 and Slovakia 29.1 TWh, according to Ember. Iceland's largest source was hydro (70.2%); Slovakia's was nuclear (66.4%). Each kWh generated emitted 28 gCO2/kWh in Iceland and 95 gCO2/kWh in Slovakia. These are Ember annual statistics for 2025, compiled from national sources; they are not real time.

Why this comparison: similar electricity demand on the same continent.

Key Facts

Nuclear supplied 66.4% of Slovakia's electricity in 2025, against none in Iceland.
Slovakia's electricity was 3.4 times as carbon intensive as Iceland's in 2025, at 95 gCO2/kWh against 28 gCO2/kWh.
Low carbon sources supplied 100.0% of Iceland's electricity in 2025 and 85.2% of Slovakia's.
Electricity demand in 2025 was 18.5 TWh in Iceland and 26.7 TWh in Slovakia.

Key Figures, 2025

Ember annual statistics

Measure	Iceland	Slovakia
Total generation	18.5 TWh	29.1 TWh
Electricity demand	18.5 TWh	26.7 TWh
Demand per person	n/a	4.88 MWh
Carbon intensity	28 gCO2/kWh	95 gCO2/kWh
Power sector emissions	0.52 MtCO2	2.76 MtCO2
Low carbon share	100.0%	85.2%
Largest source	Hydro 70.2%	Nuclear 66.4%

Generation Mix, 2025

Share of generation

Source	Iceland	Slovakia
Hydro	70.2%	10.9%
Nuclear	0.0%	66.4%
Other renewables	29.7%	0.0%
Gas	0.0%	11.3%
Bioenergy	0.0%	5.4%
Other fossil	0.0%	2.5%
Solar	0.1%	2.4%
Coal	0.0%	1.1%
Wind	0.1%	0.0%

Carbon Intensity, 1990 to 2025

Ember annual statistics

Carbon intensity of electricity generated in Iceland and Slovakia each year from 1990 to 2025, in gCO2/kWh. In 2025 it was 28 gCO2/kWh in Iceland and 95 gCO2/kWh in Slovakia.

Annual statistics through 2025, gCO2/kWh

Carbon intensity of electricity in Iceland and Slovakia, 1990 to 2025
Year	Iceland	Slovakia
1990	n/a	387 gCO2/kWh
1991	n/a	371 gCO2/kWh
1992	n/a	392 gCO2/kWh
1993	n/a	325 gCO2/kWh
1994	n/a	273 gCO2/kWh
1995	n/a	322 gCO2/kWh
1996	n/a	323 gCO2/kWh
1997	n/a	332 gCO2/kWh
1998	n/a	322 gCO2/kWh
1999	n/a	306 gCO2/kWh
2000	26 gCO2/kWh	251 gCO2/kWh
2001	26 gCO2/kWh	251 gCO2/kWh
2002	27 gCO2/kWh	225 gCO2/kWh
2003	27 gCO2/kWh	257 gCO2/kWh
2004	26 gCO2/kWh	253 gCO2/kWh
2005	26 gCO2/kWh	239 gCO2/kWh
2006	27 gCO2/kWh	231 gCO2/kWh
2007	28 gCO2/kWh	235 gCO2/kWh
2008	27 gCO2/kWh	224 gCO2/kWh
2009	28 gCO2/kWh	221 gCO2/kWh
2010	27 gCO2/kWh	205 gCO2/kWh
2011	27 gCO2/kWh	214 gCO2/kWh
2012	28 gCO2/kWh	204 gCO2/kWh
2013	28 gCO2/kWh	181 gCO2/kWh
2014	28 gCO2/kWh	173 gCO2/kWh
2015	27 gCO2/kWh	178 gCO2/kWh
2016	28 gCO2/kWh	177 gCO2/kWh
2017	28 gCO2/kWh	184 gCO2/kWh
2018	28 gCO2/kWh	191 gCO2/kWh
2019	28 gCO2/kWh	171 gCO2/kWh
2020	28 gCO2/kWh	159 gCO2/kWh
2021	28 gCO2/kWh	167 gCO2/kWh
2022	28 gCO2/kWh	142 gCO2/kWh
2023	28 gCO2/kWh	115 gCO2/kWh
2024	28 gCO2/kWh	97 gCO2/kWh
2025	28 gCO2/kWh	95 gCO2/kWh

Demand per Person, 1990 to 2025

Ember annual statistics

Electricity demand per person in Iceland and Slovakia each year from 1990 to 2025, in MWh. In 2025 it was n/a in Iceland and 4.88 MWh in Slovakia.

Annual statistics through 2025, MWh

Electricity demand per person in Iceland and Slovakia, 1990 to 2025
Year	Iceland	Slovakia
1990	n/a	n/a
1991	n/a	n/a
1992	n/a	n/a
1993	n/a	n/a
1994	n/a	n/a
1995	n/a	n/a
1996	n/a	n/a
1997	n/a	n/a
1998	n/a	n/a
1999	n/a	n/a
2000	27.06 MWh	5.22 MWh
2001	27.93 MWh	5.23 MWh
2002	29.03 MWh	5.21 MWh
2003	29.14 MWh	5.34 MWh
2004	29.23 MWh	5.32 MWh
2005	29.01 MWh	5.22 MWh
2006	32.42 MWh	5.38 MWh
2007	38.15 MWh	5.50 MWh
2008	51.46 MWh	5.43 MWh
2009	52.45 MWh	5.06 MWh
2010	52.62 MWh	5.29 MWh
2011	52.80 MWh	5.37 MWh
2012	53.89 MWh	5.31 MWh
2013	55.54 MWh	5.28 MWh
2014	54.35 MWh	5.21 MWh
2015	56.05 MWh	5.35 MWh
2016	54.15 MWh	5.43 MWh
2017	55.51 MWh	5.60 MWh
2018	55.80 MWh	5.57 MWh
2019	53.67 MWh	5.49 MWh
2020	51.53 MWh	5.29 MWh
2021	52.03 MWh	5.60 MWh
2022	52.24 MWh	5.11 MWh
2023	51.12 MWh	4.73 MWh
2024	48.42 MWh	4.83 MWh
2025	n/a	4.88 MWh

Iceland history · Slovakia history

Source: Ember (ember-energy.org), licensed under CC BY 4.0. Data as of 2025.

Iceland vs Slovakia: Electricity Compared

Key Facts

Key Figures, 2025

Generation Mix, 2025

Carbon Intensity, 1990 to 2025

Demand per Person, 1990 to 2025

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