Introduction: Sweden’s Starting Point in the Energy Transition
The report presents Sweden as one of the countries best positioned to advance toward a fully renewable power system. Its electricity sector is already almost entirely decarbonised, supported by large hydropower resources, nuclear generation, biomass-fuelled district heating, strong interconnections with neighbouring countries, and a policy framework that combines market mechanisms with support for innovation.
In 2017, Sweden’s electricity production was made up of around 40 percent hydropower, 39 percent nuclear, 11 percent wind power, and 10 percent combined heat and power, most of it fuelled by renewable sources. This means the country begins its transition from a relatively advanced position rather than from a fossil-heavy baseline.
At the same time, the report stresses that Sweden’s current low-carbon electricity system is not yet the same as a 100 percent renewable one. Nuclear power plants are expected to retire as they reach the end of their operating lives, while electricity demand is likely to rise because of greater electrification in transport, industry, and new uses such as data centres. This creates a dual challenge: replacing conventional low-carbon supply while also accommodating growing demand.
Study Objectives and Analytical Approach
The report has two main goals. The first is to explore how systemic innovations could help Sweden achieve 100 percent renewable electricity by 2040, especially by supporting the integration of higher shares of variable renewable energy such as wind and solar. The second is to use Sweden’s experience to inform and inspire other countries seeking higher renewable power ambitions through international co-operation.
The analysis is built around a systemic innovation framework rather than a single-technology approach. It combines insights from enabling technologies, market design, business models, and system operation. The report emphasizes that achieving high shares of renewables cannot depend on generation technologies alone. It requires coordinated changes across the full power system value chain, from supply and transmission through distribution and demand.
Global Energy Transformation and the Swedish Context
The report situates Sweden within a wider global energy transformation driven by climate commitments, falling renewable costs, and the electrification of end-use sectors. It notes that renewable electricity combined with electrification of transport and heat can deliver a major share of the emissions reductions needed by mid-century. As a result, integrating variable renewable energy at scale is becoming a central challenge in many countries.
For Sweden, this challenge is particularly linked to wind power. Solar is expected to play a smaller role than wind in the future generation mix, while existing hydropower remains an important source of flexibility. The report makes clear that Sweden’s transition will therefore depend heavily on how effectively it integrates larger amounts of wind generation while maintaining system balance, reliability, and affordability.
Key Policy and Regulatory Challenges
The report identifies four major policy and regulatory challenges that Sweden must address on the path to 100 percent renewable electricity.
The first is market design. Sweden’s approach, like the broader European model, relies on well-functioning energy-only markets to send price signals and incentivize flexibility. In a system with high shares of variable generation, market design must better reward system-friendly behaviour and facilitate coordination across the full value chain.
The second challenge is security of supply. This includes generation adequacy and ensuring that enough capacity is available when needed, especially as older power plants are phased out. It also includes the need for planning and permitting processes that are fast and effective enough to support new renewable capacity additions.
The third challenge is distribution and transmission infrastructure. The report notes that more network capacity will be needed as generation and consumption patterns change, particularly because more renewable generation is expected in the north while major consumption centres are in the south. Transmission expansion, refurbishment of aging infrastructure, and better planning rules are therefore critical.
The fourth challenge is managing rising electrification, decentralisation, and digitalisation. Power systems are becoming more complex as new actors, smart technologies, distributed energy resources, and sector coupling become more prominent. Sweden will need a framework that can govern this increasingly interconnected and digitalised system effectively.
Key System Operation Challenges
From an operational perspective, the report identifies four additional but interconnected challenges.
The first is ensuring system stability. As conventional synchronous generators such as nuclear plants retire and more variable renewable generation is connected through power electronics, inertia in the power system declines. This creates frequency stability challenges and increases the importance of ancillary services.
The second is balancing supply and demand. Greater wind deployment, especially in northern Sweden, combined with stronger demand in the south, is expected to create larger price differences and growing risks of shortages or surpluses depending on weather conditions and time of use.
The third is expanding network infrastructure. The report notes that grid investments across the Nordic region are already high and expected to remain so, but long lead times for transmission projects raise concerns about whether infrastructure can be expanded quickly enough to match rapid shifts in generation and demand.
The fourth is adapting the roles of actors. Responsibilities between the transmission system operator and local and regional grid owners remain insufficiently clear in some respects, and the report argues that the transition to a more distributed and complex system requires stronger coordination and more clearly defined institutional roles.
Solution I: Innovative Ancillary Services from Conventional and Variable Renewable Energy Sources
The first solution proposed in the report focuses on the provision of ancillary services by both hydropower and variable renewable sources such as wind and solar. The objective is to maintain system stability in a future with lower inertia and a greater share of asynchronous generation.
The report explains that hydropower already plays a central role in Sweden’s ancillary service provision, but future arrangements should increasingly allow and incentivize wind and solar installations, often combined with batteries or grid-forming inverters, to contribute as well. Advanced weather forecasting, utility-scale batteries, artificial intelligence, and digital monitoring tools are part of the enabling technology set for this solution.
The market component involves increasing time granularity in electricity markets, shortening imbalance settlement periods, and creating remuneration mechanisms that better value the speed and quality of response that different resources can provide. The report points to the need for new ancillary service products and more explicit market incentives for flexibility.
Swedish implementation examples include battery storage at the Forshuvud hydropower plant, where batteries are used alongside hydropower to improve frequency regulation and reduce wear and tear on turbines. The report also notes that wind power generators are already allowed to provide balancing and ancillary services in Sweden, as in several other European countries.
The broader conclusion of this section is that ancillary services should no longer be treated as the domain of conventional generators alone. In a renewable-based power system, both renewable and conventional assets must contribute to system balancing and stability in a more coordinated way.
Solution II: Pan-European Market as a Flexibility Provider
The second solution looks beyond Sweden’s borders and focuses on the role of the pan-European electricity market as a provider of flexibility. The report argues that Sweden can enhance renewable integration by making fuller use of regional and continental market integration, effective cross-border coordination, and stronger cooperation among system operators.
This solution is grounded in the idea that geographical diversity reduces variability. By participating in a larger regional market with diverse renewable resources and different demand patterns, Sweden can balance fluctuations more efficiently and reduce overall system costs.
The report explains that Europe already has one of the most advanced examples of regional market integration in the world, especially through single day-ahead coupling and single intraday coupling. However, it argues that more can still be done, particularly by increasing time granularity in short-term markets, harmonising market rules further, and strengthening cross-border balancing platforms.
Examples include the wider European intraday market and balancing market developments, as well as Denmark’s experience in integrating high shares of variable renewable energy through strong interconnections and regional market participation. The report treats Sweden’s regional position as a major asset, but also notes that this solution requires clear institutional arrangements, strong trust among operators, and continued investments in interconnection capacity.
The overall message is that regional markets are not just trading platforms. They are also flexibility mechanisms that can improve renewable integration, reduce balancing costs, and help manage variability more effectively than isolated national systems.
Solution III: System-Friendly Integration of Distributed Energy Resources
The third solution focuses on distributed energy resources and their role in managing flexibility at the distribution level. This is presented as a response to two linked issues: rising pressure on the transmission system and the need for more local flexibility to deal with network congestion, variable generation, and demand peaks.
The report defines distributed energy resources broadly to include behind-the-meter batteries, electric vehicle smart charging, renewable power-to-heat, distributed generation, and demand response. These resources can provide services both to local distribution grids and, in some cases, to the wider transmission system.
A key concept in this section is aggregation. Since individual distributed assets often provide only small amounts of capacity or flexibility, aggregators can combine them into larger portfolios that are tradable and operationally useful. This makes it possible to use distributed resources as a serious source of system flexibility rather than as isolated marginal technologies.
The report also highlights the role of digital infrastructure, smart meters, data hubs, artificial intelligence, and blockchain-like data coordination tools in making this possible. Sweden, along with other Nordic countries, is moving toward data hub implementation that will improve access to metering data and support more advanced market participation and customer-oriented services.
The benefit of this solution is that it can address local congestion, reduce pressure on the transmission grid, and create more resilient and flexible system operation without relying exclusively on large new transmission projects. It also links directly to consumer participation and the broader decentralisation of the power system.
Solution IV: Decarbonisation of End-Use Sectors via Electrification with Renewable Energy Sources
The fourth solution expands the analysis beyond the electricity sector itself by focusing on electrification of end-use sectors such as transport, housing, and industry. The report argues that this is not only a decarbonisation strategy but also a flexibility strategy, because electrified end uses can interact with the power system in ways that help balance supply and demand.
Direct electrification includes technologies such as electric vehicles, heat pumps, and renewable power-to-heat systems. Indirect electrification includes renewable power-to-hydrogen, where electricity is converted into hydrogen for industrial use, transport, storage, or later reconversion.
The report places particular emphasis on hard-to-abate sectors such as steel production. Sweden’s HYBRIT initiative is presented as a major example of how renewable electricity and hydrogen can transform industrial processes. By replacing fossil-based inputs with hydrogen produced from renewable electricity, the report shows how electrification can extend far beyond households and passenger vehicles.
This solution is described as complex and potentially disruptive, but also highly strategic. It helps decarbonise demand sectors, creates new sources of flexibility, and strengthens the rationale for expanding renewable generation capacity. At the same time, it requires coordinated market design, investment, infrastructure planning, and digital control systems.
Lessons from International Experience
The report draws on examples from countries and systems with high renewable shares, including Denmark, Germany, Costa Rica, Paraguay, and Uruguay. These examples are used to show that high levels of renewable integration are feasible under the right conditions.
Countries with high shares of variable renewables demonstrate the importance of strong ancillary service markets, accurate forecasting, regional integration, and flexible demand-side resources. The report uses these international cases to support the claim that Sweden’s 2040 target is achievable if system-wide innovation and coordination continue to advance.
Qualitative Assessment of Benefits, Costs, and Complexity
Each of the four solutions is accompanied by a qualitative assessment of expected benefits, implementation costs, and institutional or technical complexity. The report does not claim that any of the solutions are simple or costless. Instead, it shows that each involves trade-offs and requires action by multiple stakeholders.
Solution I is considered to provide high flexibility benefits but also requires technological adaptation, new remuneration mechanisms, and closer cooperation between generators and the transmission system operator. Solution II offers substantial system-wide flexibility and regional efficiency gains, but depends on continued regulatory harmonisation and cross-border institutional coordination. Solution III can reduce network constraints and increase local flexibility, but requires new business models, digital systems, and regulatory recognition of aggregators and distributed assets. Solution IV has potentially transformative decarbonisation effects, especially in hard-to-abate sectors, but is technologically and institutionally complex.
The broader point of these assessments is that Sweden’s transition will not depend on one solution alone. It will require the combination of multiple innovations across technologies, markets, business models, and system operation.
Recommendations for Policy Makers
The report concludes with recommendations centered on systemic coordination. It argues that Sweden should continue strengthening both national and regional market frameworks, ensure timely implementation of European regulations, and create incentives for flexibility across all time scales and system levels.
Policy makers are encouraged to define clear responsibilities among system actors, support transmission and distribution investments, accelerate digitalisation and data access, and enable broader participation of distributed resources and new business models in electricity markets. The report also underscores the need for stakeholder consultation, because the transition affects generators, grid operators, market operators, aggregators, consumers, regulators, and industrial actors alike.
Another central recommendation is to treat innovation systemically. Rather than evaluating technologies in isolation, Sweden should combine enabling technologies, market design reforms, business model innovation, and updated system operation practices. This is presented as essential for managing complexity and capturing synergies.
Conclusion
The report presents Sweden’s target of 100 percent renewable electricity by 2040 as ambitious but achievable. The country starts from a strong position, with an already low-carbon power sector, extensive hydropower, well-developed institutions, and participation in highly integrated regional electricity markets.
However, the transition ahead is not simply about adding more renewable generation. It is about redesigning how the power system works. As nuclear generation retires and electricity demand grows, Sweden will need to rely on a broader set of flexibility options, more advanced market signals, stronger cross-border coordination, better use of distributed resources, and deeper electrification of end-use sectors.
The overall message is that a renewable future for Sweden depends on systemic innovation. By combining ancillary service reform, regional market integration, distributed flexibility, and electrification, Sweden can move toward a power system that is not only renewable, but also reliable, affordable, and resilient.
