Photo by: Mattias Klum (MKTG) and Stockholm Environment Institute

On the 1^st of February, this year, the biggest governance overhaul of Swedish hydropower in a century entered a new phase of implementation. This occurred when the first owners of hydropower installations, in 17 river basins, sent in permit review documents to the Land and Environmental Court, as part of the implementation of the National Plan of Hydropower Permit Review (NAP). Over the coming 20 years, all Swedish hydropower owners that signed up to the NAP (virtually all owners have done so) are required to apply for new hydropower permits that include modern environmental provisions. The overall aim of the process is to provide the maximum possible benefit to the aquatic environment and a nationally effective supply of hydropower electricity.

There is no doubt that hydropower is an important energy resource. Apart from being renewable, it is also valuable in that it provides high flexibility to the electric system which makes it fundamental for Sweden’s efforts to decarbonize. Hydropower production, however, deteriorates the connectivity of rivers – the movement and exchange of water, energy, material and species within the river system and surrounding landscape – to the significant detriment of the aquatic environment and biodiversity. When water is used for hydropower production, it loses most of the characteristics that support river connectivity. When trying to understand the essences of this national permit review process, one useful perspective is thus to view it as a national exercise of reallocating water between the, largely competing, requirements of the electric system and riverine ecosystems. Water reallocation is a governance process that includes a multitude of stakeholders that range from hydropower owners, local residents, Sámi representatives to environmental NGOs.

The governance challenges are thus significant, which means that more efficient, equitable and resilient solutions, even if identified, might not be possible to implement. In an attempt, to provide structure for analyzing and understanding the type of processes which the national permit review entails, we propose a framework of water reallocation in highly modified rivers in a recently published peer review article. The framework builds on insights from social-hydrological systems research, adaptive governance research and water reallocation research, and we test it on Sweden in a pre- and post- 2019 analysis. 2019 becomes a significant year in our analysis since this is the year the governance overhaul of hydropower formally started in the country. Based on our analysis we find that there has been an increase in adaptive capacity, understood as the capacity to reallocate water, but that this is linked mainly to water reallocation that will occur in smaller rivers and tributaries with small scale hydropower production. Rivers with large scale hydropower production are set to enjoy limited water reallocation, or we may even see increased allocation of water towards hydropower in the coming years, in the interest of increasing hydropower’s flexibility contribution to the electric system.

In this first round of implementation of the NAP, the involved basins and hydropower installations are small, but exhibit shifting character and importance. They include the mini station in Ihreån, the only hydropower installation on Gotland, to 18 hydropower installations in Rönne Å, Skåne, where the municipality of Klippan has bought and will decommission the three largest hydropower stations in the basin. As with all significant societal changes, there are varying and, at times, opposed opinions of these developments, which are reflected in the active debate that took place in the biggest Swedish newspaper at the start of this process.

Although our framework will not be able to solve all trade-offs and conflicting interests, it does provide a basis on which to analyze and understand this process and compare Sweden’s efforts in an EU setting. This is the case since the framework is broad enough to be of general interest yet sufficiently specific to provide clarity of analysis and a possibility for the cross-case analysis of various countries, with high hydropower production. We identify the EU’s top hydropower producing countries (including Sweden, France, Spain and Finland) of special interest for comparative analysis since they are all subject to the same EU directives requiring water reallocation to improve riverine ecosystem functioning while increasing the share of renewable energy. In this line, we have applied for funding with collaborating universities across Europe to continue this work.

We hope to be able to share good news and update you on these developments in coming blog posts!

Peter M. Rudberg, researcher at GeoViable
Timos Karpouzoglou, researcher, Division of History of Science, Technology and Environment, KTH Royal Institute of Technology

Make the Baltic Sea happy again

“I have met both goodtemplars and tee-totallers, but no one has refused the traditional fish schnapps. That’s the most absurd thing I’ve heard in my entire life; to skip the fish schnapps. When fish is the only food you get here in the archipelago!”

The quote above is from the book Roslagsberättelser by Swedish author and artist Albert Engström, published in 1942. Eighty years ago, fish was the only food available in the Baltic Sea archipelago. Today, the only fish to be found in the archipelago comes by refrigerated truck from Gothenburg. Engström worried that his beloved “rospiggar”, his fishermen and skippers, customs officers and smugglers, would disappear from the archipelago. But the fish disappearing, that was probably unimaginable eighty years ago.

We are many who can share childhood memories from the coast, from fishing excursions and sailing trips. We all agree that there has been a sharp deterioration in our marine ecosystems during our own lifetime. So the question is; can we live sustainably around the Baltic Sea?

The Baltic Sea is special. Basically, it consists of a depression in the Phenobaltic bedrock shield that arose 400 million years ago when Scandinavia collided with Greenland. But what we call the Baltic Sea today is much younger, just a few thousand years old. When the ice sheet began to melt about 14,000 years ago, the Baltic Sea first became a lake full of meltwater. Then, when the surface of the world’s oceans rose, it became a saltwater bay. Due to post-glacial landrise, the connection with the Oceans narrowed and the Baltic Sea has been brackish for the past 3,000 years. It is thus a very young – therefore fragile – ecosystem. A couple of thousand years is not much for species to adapt and thrive.

One species that thrives is homo sapiens. Today, we are around 85 million people in the Baltic Sea catchment area. We live in 14 countries and speak different languages. We have different economics and policies, and different relations to the Baltic Sea. Of course, collaborating can be difficult and the Baltic Sea was for a long time a perfect example of the “tragedy of the commons”, with over-fishing and garbage dumping. We now also know that climate change will increase runoff and thus inflow of harmful substances, while development pressure increases along coastal areas.

What matters is what we can do about it. KTH has started the Baltic Tech Initiative to seek concrete and scalable solutions to three key challenges.

1. Reduce the impact of humans. For example, with constructed wetlands we can reduce the load from watercourses, where 95% of the phosphorus supply and 70% of the nitrogen today come. The electrification of transport by sea is another area KTH wants to speed up.
2. Deal with old environmental sins. The amount of nutrient inflow has decreased sharply since the 1980s, but large amounts of phosphorus remain in the sediments. Phosphorus is a finite resource needed for food production and KTH is now testing whether it is possible to recover phosphorus from sediments in the Baltic Sea and utilize it on land again.
3. A data revolution in the oceans. We are on the doorstep of a new era. For thousands of years we have managed the oceans in exactly the same way we managed our terrestrial lands as hunters and gatherers. We have enjoyed a predator’s life at the top of the food chain. If we are to manage the oceans sustainably, and cultivate our food, energy and our industrial raw materials, then knowledge is going to be absolutely crucial. A data revolution in the oceans is around the corner and the instrumentation of marine environments has started. The sea is our next space race, and we do not want to make that journey blindfolded.

KTH is just one of many actors and by collaborating with others we can achieve more. KTH can not do everything. But we will do everything we can. Do you want to join us on that voyage?

David Nilsson

Director, WaterCentre@KTH

Scientific Coordinator of KTH Baltic Tech Initiative

This text is an edited and shortened version of David Nilsson’s speech at the KTH Baltic Tech launch on 1 December, 2021.  

The Baltic Sea is surrounded by a huge drainage area, due to the many rivers flowing into the Baltic Sea. Nutrients and toxic pollutants originating from human activities end up in the marine environment. Stormwater management is an increasingly important issue in society due to urbanisation and increasing volumes of rainfall due to climate change. These challenges force the Baltic regions to develop stormwater treatment solutions that can clean stormwater effectively and ensure standard water quality and management in real time.

Our group at KTH, together with our Baltic partners in the CleanStormWater project in Riga, Viimsi and Turku, are designing and testing new treatment systems, assess stormwater management solutions, develop e-monitoring systems for real time water quality management as well as establish centralised and decentralised stormwater solutions. Different stormwater treatment solutions and also e-monitoring systems will be developed, tested and/or implemented. Compared to manually collected samples, e-monitoring gives continuous information of physical parameters such as flow rate, turbidity, electrical conductivity and suspended solids. This not only helps municipalities to better monitor their stormwater quality and intervene rapidly when necessary, but also helps to identify the best technical solutions in the development stage. Since different geological, utilisation and/or urban situations will require different solutions, the project will use different sites around the Baltic Sea and evaluate different technological solutions including sedimentation, ponds, separators and bioretention systems.

KTH will collaborate with Initiative Utö on their study sites on the island of Utö. In Utö, two wetlands designed for stormwater treatment have recently been constructed (see figure 1), while a third one will be constructed to clean the stormwater from the Utö military-firing range in the near future. The wetland has an inflow from two ditches which combine in a sedimentation pond which has a circulation time of 48 hours during normal operations, the sedimentation pond is also the home of a number of crayfish. From there the stormwater is led to the wetland area, where plants treat the water. Then the water enters a pool where more substances can sediment. In this pool young peach and pike live and can grow so they will not be eaten by the three-spined stickleback which dominates the Baltic Sea. Lastly, the water is released to the Baltic Sea in a bay called Södra Fladen. The wetland is designed to decrease the amount of nutrients and heavy metals flowing into the Södra Fladen and by extension the Baltic Sea. By releasing more fully grown peach and pike to the Södra Fladen, the diversity of predatory fishes in the Baltic Sea have the ability to be restored.

Understanding the efficiency of the constructed wetland system for stormwater treatment needs careful evaluation of the water quality over a longer period of time. At these sites samples are taken from the inlet water, the process and the outlet water to evaluate the treatment efficiency. More specifically nutrients, heavy metals, PAH:s and oil are analysed in the samples. The CleanStormWater project is currently ongoing. Results from this project will give more insight to wetlands’ ability to treat stormwater and other properties such as habitat for wildlife, which can be implemented in other wetlands around the Baltic Sea. In addition, a better understanding of the implementation of e-monitoring in stormwater treatments, can promote the usage of similar systems in other treatment sites around the Baltic Sea.

Tobias Karlsson
Research Engineer, KTH

KTH Baltic Tech Initiative project (in Swedish)

Interreg CB project Cleanstormwater

How many people do you think live in water-scarce areas? A wild chatter erupts in the classroom as the elementary-school students start debating my question. A hundred thousand! says a student. More, I say. A million? More! Two billion? Yes! A proud smile emerges on the face of the student who got the right answer. Then, a heavy atmosphere rapidly descends on the group as they intuitively begin to realize what it means. That day, the students gained deeper fundamental insights into the importance of water. That day, I visited as part of an event called ForskarFredag (Researchers’ Night).

Photo by Ben Libberton

Before visiting the class, I asked a talented coworker how I could inspire the students. He confidently exclaimed: Talk about something they are interested in! And so I started interacting with the students to find what made them engaged. The answer surprised me. One time I said: Talk to the person next to you, how do you think we can make drinkable water from seawater? Again, wild chatter ensued. Whenever I let the students discuss amongst themselves, the floodgates to inspiration would open. Filtering? Heat the water? Use local resources? And when I let them ask freely about our research, the questions went on and on in a steady stream. After 20 minutes of being flooded with questions, I had to stop answering because we were running out of time. The experience taught me that lots of young people share a deep common interest. An interest in science.

Another day, I happily visited a group of older students from all over the world. They were young people who had not yet started working as researchers, and they had joined in a competition for the best innovations in water technology (Stockholm Junior Water Prize). There, a young man from India told me: Where I grew up you cannot drink tap water because of all the contaminations. Actually, many of us work with water to change this. Looking at his friend, he continued: We have worked for a year on developing a technique called capacitive deionization to help with cleaning water. As I looked around the crowded room, I suddenly began to realize how much hard work people put in. They had insights about water, they were deeply interested science, and they passionately drove innovations.

A while back, researchers at KTH started a company based on the same capacitive-deionization technology. While small at first, their hard work rapidly expanded the company and lots of people can now enjoy the purified water that they are producing. Recently, the company made the list of top 41 startups in Sweden focusing on environmental technology. Their example clearly showed me how much we can achieve through hard work in water technologies. Now is the time when years of valuable fundamental research are finding their way to the larger society.

The end ties back to the beginning. Looking at these successes, I saw the company’s progress would not have been possible unless someone had first noticed how important water is and used their passion for science. And so, it starts with you and me. We could attend big events like ForskarFredag and the water competition. Or, you could simply start a conversation about water with a young person you know. Whenever we spread the knowledge and tap into young people’s interest in science, we are all building the solid foundations of a better tomorrow.

Johan Nordstrand
Doctoral Student at KTH

The ForskarFredag event will be held again in 2022 and researchers are encouraged to join. I would also like to extend my gratitude to all the teachers who invited researchers to their classes and got the students engaged. The event would not have been possible without you and I hope even more teachers are joining the event next year. More information: https://forskarfredag.se/

Information about the competition (Organized by SIWI, hosted visit to KTH by WaterCentre@KTH): https://www.kth.se/en/aktuellt/nyheter/an-international-vip-visit-from-young-innovators-focuses-on-water-1.920985

The company: https://stockholmwater.com/

More information about me: https://www.kth.se/profile/johanno3

Climate change has contributed to Sweden experiencing water shortages in many provinces in recent years, and continued challenges with rampant climate change are likely to further accelerate this problem. In many other countries, the problem of water scarcity is much more pronounced. The UN report “World Water Development Report 2020, Water and Climate Change” describes a gloomy picture of the water situation in the world, e.g. As many as 2.2 billion people do not have access to drinking water. The UN warns that climate change will exacerbate this situation if measures are not taken in this area. Access to clean water and sanitation for all is one of the UN’s global goals (SDG6). Achieving these goals requires a restructuring of society’s infrastructure. The increasing water shortage will lead to more advanced treatment methods having to be used to produce our drinking water with an increased energy need for water treatment in society.

In the built environment, large amounts of drinking water are used for various purposes, such as hot water for shower, bath, and sink, but also for other functions such as toilet flushing and lawn watering. Significant amounts of energy, chemicals, water, and financial resources are required to maintain this system. As an example, around 11 TWh is used annually for heating domestic hot water in villas, apartment buildings and premises in Sweden, corresponding to an estimated cost of SEK 10 billion annually (Energy Situation 2020, STEM). Of these 11 TWh, the entire 3.5 TWh loads the electricity grid. In addition to this massive energy demand, domestic hot water heating drives up the power demand in society’s infrastructure for energy supply, which entails major challenges for both energy producers and grid owners.

It is interesting that only a small part of the water used in society today is used for functions that require the relatively high quality of drinking water. The remaining amount of water is used for other purposes such as toilet flushing, shower, dishes, laundry.

By recycling and managing most of this cycle locally at building or area level, the water system would be more resource efficient, partly from an energy and power perspective, partly from a water supply and use perspective. Thus, to increase resource efficiency in this area, water can be used better and in a more sustainable way if water can be recycled and heat recovery is introduced on a broad front.

How this can be done in the best way is not clear, today there are a number of different system solutions with different technical maturity levels. For these types of systems solutions to succeed in the society, interdisciplinary research is required.

Pressure from property owners, planners and construction companies regarding sustainable water systems already exists today, driven partly by energy requirements and partly by the environment and environmental certification requirements. Even though innovative system solutions are in demand, there are no complete solutions available due to that knowledge of opportunities is lacking.

This new project, to be executed by doctorial student Viktor La Torre Rapp and supervised by Dr Jörgen Wallin (KTH) and Dr Jesper Knutsson (CTH), aim to identify which solutions, recycling solutions or recycling solutions with associated system structures provide the best conditions for meeting the challenges identified regarding water supply in society.

The goal is to present which possible system solutions and methods are conceivable for implementation at different levels in the built environment from a life cycle perspective and which are not based on a list of criteria that cover aspects in regulation, acceptance, economy, environment, and health. This presentation should include an account of the identified solutions, how the overall financial picture is compared to current technology with maintenance costs included. A reference group consisting of property owners, planners and construction companies as well as water suppliers and producers will join in order to optimize the use of the outcome and enhance the implementation of possible solutions.
During the project one or more selected promising solutions will be implemented and validated in test beds, HSB Living Lab In Gothenburg and KTH Live in Lab in Stockholm.

The project is funded by E2B2 and will take place during 2021-2024.

Viktor La Torre Rapp, Doctoral Student, Dept. of Energy Technology, KTH School of Industrial Engineering and Management