Sweden generates about 99% of its electricity from low-carbon sources, with fossil fuels making up just 1.2% of the mix. The country's power grid relies heavily on hydropower (around 40%), nuclear (about 27-29%), and wind (roughly 25%), supplemented by smaller shares from solar, biofuels, and other renewables. This fossil-free dominance isn't new; Sweden has been phasing out coal, oil, and gas for decades, achieving near-total decarbonization of its electricity sector while exporting clean power to neighbors.
This setup makes Sweden a global leader in sustainable energy, with low emissions per capita (0.6 tonnes CO2e) and a commitment to 100% renewable electricity by 2040. It's a model for how abundant natural resources like rivers and wind, combined with strategic nuclear use, can power a modern economy without relying on dirty fuels.
Sweden has long relied on nuclear energy as a cornerstone of its electricity system, providing stable, low-carbon baseload power that complements its abundant hydropower and growing wind resources. This role has evolved from a response to energy security concerns in the 1970s to a key element in the country's push toward net-zero emissions amid rising electricity demand.
Sweden's nuclear program began in the late 1960s as a strategy to diversify away from oil imports and support industrial growth, especially after the 1973 oil crisis exposed vulnerabilities in fossil fuel dependence. At the time, oil accounted for about 75% of the country's energy consumption, prompting a rapid build-out of nuclear reactors alongside hydropower. By the 1980s, nuclear had become integral, but a 1980 referendum led to a government decision to phase it out—though this was never fully implemented due to economic and energy needs. Instead, Sweden maintained and upgraded its fleet, avoiding new builds until recent policy shifts.
As of 2024-2025 data, nuclear power generates approximately 29-30% of Sweden's electricity, with six operational reactors across three plants: Forsmark (three reactors), Ringhals (two), and Oskarshamn (one). This contributes to Sweden's near-fossil-free grid, where nuclear provides reliable, dispatchable energy that balances intermittent renewables like wind (about 23%) and hydro (38%). In 2024, nuclear produced around 50 TWh out of total generation of 172 TWh, helping keep per-capita CO2 emissions low and enabling electricity exports to neighboring countries. It's particularly vital for grid stability in southern Sweden, where demand is high and hydro resources are limited.
Nuclear's efficiency is evident in its high capacity factors (often over 90%), minimal fuel needs, and role in decarbonization—Sweden's electricity sector emissions are among the world's lowest, at under 10g CO2/kWh. However, aging infrastructure has led to some reactor closures (e.g., two at Ringhals in recent years), reducing capacity from a peak of 12 reactors.
Future Plans and Policy
In a major pivot, the Swedish government under Prime Minister Ulf Kristersson shifted in 2023 from a "100% renewable" target to "100% fossil-free" by 2045, explicitly endorsing nuclear expansion to meet projected doubling of electricity demand by 2040-2045 (driven by electrification in transport, industry, and data centers). Plans include building two new large-scale reactors by 2035 and up to ten equivalent reactors by 2045, potentially including small modular reactors (SMRs) like GE's BWRX-300. A 2025 OECD report highlights nuclear (alongside onshore wind) as the most cost-effective option for this growth, with no viable role for offshore wind in least-cost scenarios.
Public opinion remains mixed, with about 50-60% supporting nuclear in polls, but the policy emphasizes its environmental benefits, such as reducing emissions by an estimated 62% in historical contexts. Challenges include high upfront costs, regulatory hurdles, and waste management, but Sweden's experience positions it as a leader in safe nuclear operations.
Overall, nuclear energy is pivotal to Sweden's energy security, climate goals, and economic competitiveness, evolving from a transitional technology to a long-term pillar in a fossil-free future.
Now, comparing Sweden to Croatia on renewable energy:
While Sweden's electricity is over 70% renewable (hydro, wind, solar, etc., excluding nuclear), Croatia hit a milestone in 2025 with renewables supplying 52.6% of its electricity consumption—including hydro (26%), wind/solar/biomass/biogas (26.6%).
Croatia's mix still includes notable fossil shares like gas (13%) and coal (4%), plus heavy imports (31%), but it's making rapid progress: renewable production grew, fossil output dropped over 50% in parts of 2025, and solar/wind are booming. Sweden is farther along in full decarbonization, but Croatia's trajectory shows strong potential, especially with targets for 42.5% renewables in overall energy by 2030. Both nations highlight Europe's push toward green power!
Zeljko Serdar, Croatian Center of Renewable Energy Sources (CCRES)








