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Democracy in Energy

Can there be democracy in energy? Power supply and power distribution are core topics in the theory of democracy as well. One of the foundations of democracy is the separation of power into a legislative, executive and a judicial power. A resilient democracy can assure a sufficient functioning of this fragile “balance of power”. In an energy market or a nation’s energy distribution a comparable balance of (electric or gas) power provision might be envisaged. The costs of parallel infrastructures of power distribution are high, but the resilience of overall power distribution will benefit. Also from a redundancy perspective, more than one distribution system may step in if there are failures or delivery problems with one of the distribution networks. The democracy in energy perspective goes beyond this simple analogy. Power supply as well as power distribution have been concentrated in large public or private enterprises, which might care little in terms of security or reliability of the overall system, not only during armed conflicts. Independent energy production and use, for example through wind and solar energy including batteries have pushed the feasibility of more democracy in energy to new boundaries. These technologies have enabled a new bifurcation and make room for more democracy in energy. It is a rather realistic version of a previously rather utopian vision.

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Democracy in architecture

Over centuries we have pondered how to bring more democracy into architecture. This very idea is different from designing parliaments or other democratic institutions like courts or the representation of executive power in a democracy. Bottom-up or direct participation, beyond the pseudo open participation in a competition for the chosen best design, could take the form of voting by and/or listening to the people before any realization. Rather than relying on the choice of elected representatives, we may envisage the observation of people’s choices. Such a kind of bottom-up approach has been chosen by Anna Jung and Lea Krueger who let persons chose, where they wanted to take a rest at the Kulturforum in Berlin by moving chairs to a  specific place or a nearby location. Rather than yet another grand design people could freely choose their favorite niche for 1 or 2 chairs. Sometimes just looking for shadow next to a wall or under a tree, sometimes desperate for a little green spot. Democracy in architecture can simply mean to think architecture from the people’s perspective or an observed user’s experience. Democracy in architecture could resemble a bit more the internet revolution and think in terms of user interface, UX-design. With the construction of the “Berlin Modern” well under way, such green niches shall be appreciated by many people passing by and those who would like to rest for a while.  

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Art and fashion

There is fashionable art and arty-ish fashion. The links between art and fashion are manifold and new explorations of the link are always an interesting variation of the original theme. The Berlin “Gemäldegalerie“ has added a contemporary perspective in connection with Berlin fashion week 2026 to the already rich collection on the topic. The exhibition confronts the craft of the world of fashion represented by the dresses on actual display with photographs of those dressed worn by models against the backdrop of the historic inspiration. Add sound and video to this format and you will be close to total immersion into the world of art and fashion yourself. Art and fashion may be a part of all us, not only the privileged few in society. It is most of all a question of crafts related to art, design and fashion, which dominates the creative process. A strong message from all involved in the project to the visitors.

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Free Lunch

Who told you that there is no free lunch? On the premises of “The Berlin Philharmonic” a group of toddlers and babies had a free musical lunch. On the occasion of the lunch concert on 2026-1-28 in the spacious entry hall young musicians (piano, Ana Bakradze, and violoncello, Carlo Lay) gave a concert with Sonatas from Beethoven (op. 69) and Britten (op. 65) to an exceptionally broad range of ages in the audience. People fully enjoyed the concert, irrespective of uncomfortable seating also on stairs, if they managed to find a seat at all. The occasional breast feeding seemed to be the free lunch for some privileged babies. The adults were invited to contribute a donation to the UN refugee fund. Instead of the usual seasonal coughing, there were delighted outcries from the youngest, which enchanted the aging audiences additionally. The 2 musicians excelled in concentration on their performance in spite of the challenging setting.

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German Cinémathèque

The “Deutsche Kinemathek” in Berlin has moved to its new location in the old E-Werk. There is room for temporary exhibitions and screening on all walls. Small boxes (3 seats) give a brief overview of the history of television. The library is accessible again to the public. In order to research what went wrong in the history of mass media and cinema in Germany during the 1930s and 1940s can get access to the archives as well. In the age of new digital media technology the study of historical approaches helps to be aware of the power of persuasion of this form of mass communication. A critical thinking perspective on the material presented and the long history of cinema can bring generations together through the exchange of experiences with different media. 

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Paper and Scissors

In order to produce art it is not always necessary to have expensive materials at your disposal. Henri Matisse has demonstrated that paper and scissors can go a long way. With this in mind, the work by Johanna Beckmann, shown in the upper hall of the “Kulturforum” in Berlin, is quite astonishing. Beckmann relied on just paper and scissors, in addition to her paper and pencil work, to illustrate her own texts as well as collections of fairy tales. Her paper cuts of some hobbit stories might be remembered by a whole generation of children and even some of today’s world. Paper cuts and theatre based on such figures have been a cross-cultural treasure. The illustration of stories, but also the creation of own characters might be derived from such cuts using just paper and scissors. The “Kunstbibliothek” and the “Lette-Verein”-academy in Berlin joined forces for this exhibition and they both continue to transmit this creative craft to students actively involved in this “intergenerational exhibition”. Please bring your (grand 😉 children.
All those who travelled to Paris recently will be well aware that at “Montmartre” you can still have your profile cut these days. At this exhibition there is a “do-it-yourself” section, not only reserved to children.

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Holocaust commemoration

The commemoration of the Shoa or the Holocaust is part of an international remembrance of atrocities against humanity. It needs to be present in countries beyond Germany, even if Germany under Hitler’s rule caries the sole responsibility for the ruthless execution of a plan and the murder of 4 million of its own people of Jewish decent and additional 2 million Jewish people of neighboring countries. In the speech by Tova Friedman, a Shoa survivor, she pointed to the perceived threat which children posed to the Nazi-regime as witnesses of mass murders. There she is. In front of the whole nation she testifies for what seems like a distant past, but for many this past is still not over. Responsibility of Germany does not stop after a certain number of years, maybe in judicial terms, but a moral obligation to act against denial of these atrocities is primordial. 20 years after the inauguration of the memorial of the holocaust in the center of Berlin and the exhibition center “topography of terror” (image below, 2026-1-27) we should start an initiative to make the International Day of the commemoration of the holocaust a national day, of commemoration, where all daily routines are paused in Germany to give people time to act and reflect on what can be done that such atrocities will never happen again.

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Time simultaneously

The simultaneous experience of time forms part of the basic understanding of what society is about. However, the participants of a simultaneous game of chess might arrive at a different perspective on time. At the same time when time advances for say 20 chess players, the one person facing the 20 players is advancing on 20 processes simultaneously, but also on a single time measure shared by all. The different processes, or chess clocks, all run in the same timeframe. The experiences of time will be rather different as the simultaneous games usually stop at very different times. Each player has to live up to her own competence, only the one simultaneous player lives in multiple games or time simultaneously. The experience, even on a much smaller scale to handle just 3 parallel processes is a challenge for us. The fascination of juggling might convey a similar experience just on a more physical level.

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Time in Chess

The more you advance in playing chess, the more time and timing becomes an issue. Sooner or later you will want to have your very own chess clock to be in control of time when playing chess. It will be difficult to keep your mind hooked on the chessboard rather than the clock as each move is linked to a point in time as well as a duration.
It was common practice for advanced players to note, not only the moves they played, but also the time they needed to play the next move. This helped to analyse the quality of your game. In specific openings of a game of chess you even keep track of “time advantages” in bringing more of your pieces into powerful positions or a “developed” position on the chessboard.
You may choose to play a “Blitz” game, which allows only 5 minutes per player to think about the next move overall, which may turn into a fast hitting battle in an protracted endgame for each side. In anticipation of this you way your time very carefully right from the beginning of the game. In short, you will never consider time as a mere second by second running of time as time has a different weight depending of the progress of the game.
Come on, it is just a game of chess, isn’t it?

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Timely timeless

It is very timely to discuss timelessness. Some inventions or artwork appear to have a timeless value. The creation of books has this feature as we have known also a lot about the conservation and restoration of books across centuries. Timelessness is about an open-ended vision of time. In mathematics it is a usual part of the differential equations‘ calculus to handle infinity as an operationalisation or a form of a projection of time into timelessness. Humans have made considerable efforts to create material and, most of all, immaterial goods which try to exist independently from time. Geek or Roman philosophy are with us for more than 2000 years and we still benefit from returning to this original concepts. Egyptian culture and the wall paintings in caves still speak to us, thousands of years afterwards. Each clock suggests that time is advancing, but some treasures achieve the level of a timeless beauty, art or conceptual masterpiece. The more we talk about time, the more we shall cherish timelessness. (Image: Neue Nationalgalerie, Berlin 2026-1, The clock screening)

 

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Time and music

The trick about music is the sheer unlimited variety it allows to experience time. We all think primarily of rhythm as the direct link between time and music. Then there are the additional annotations of composers on their scores like “lento” or “presto”. In addition each note has a frequency as swinging per second, which serves as the basis for synchronization of an orchestra. The length of each note or a each phrase of music evokes specific emotions in listeners. Human embryos even register music as the frequencies and duration travel across boundaries. The relationship of time and music is such a vast subject matter that the scope of this deserves to be studied across centuries, music periods as well as across cultures. Certainly, we find a few books on the subject beyond the simple physics of waves lengths and frequencies.

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Book as Entry

Libraries are full of books. But there is much more to a library than just books. However, many users of libraries focus on the “classic” origin of libraries as large and more or less exquisite collections of books. Therefore, it is a decent tradition to think of libraries and most of all books as a kind of “memory of the world”. Judith Schalansky writes texts and conceives books. Authors are used to choose typescripts from a huge potential choice. Going through the history of book production, can inform about the diversity of appearances of texts in book form. The panel discussion at the Stabi West in the presence of Schalansky and about Schalansky raised awareness to the point that there can be many more than just one entry into a book. However, we are so used to read front to back, that it is even hard to think about more entries. Images, typescripts and typesetting or the kind of binding, all may serve as facilitators for more ways of handling a book. 

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Time reference

Times serves as a point of reference. We often refer to precise points in time, like dates 1st of May Labour Day, or a specific hour as a reference point. If we talk about 5 minutes before 12 o’clock, we convey a kind of urgency – before it is, presumably – too late. In the arts, particularly poetry, prose or drama, and even beyond the romantic period, the reference to seasons as “emotionally loaded” terms is widely used. Subsequently, there are many compositions in music, which make use of such references as programmatic titles. Through the reference to a specific duration, the scene appears to be set and the reader or listener prepared for a less surprising experience. You might even go full circle like in Vivaldi’s composition of “The 4 seasons”.
The writer, poet and Shakespeare translator Thomas Brasch (Link to publications) has written the poem “Der schöne 27. September” (1980) with an exact reference to a point in time, but reporting in 10 lines, what he didn’t do on that date (own translation).
“I didn’t read a newspaper.
…
I didn’t write a single line of text.
I didn’t set something in motion.”
(Extract from Thomas Brasch poem see above;
image below, Global stones project)

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Time Concatenated

As a measure of the psychological and social pressure time may convey on people, it is useful to look into how time is concatenated. In a calendar we often make appointments in a form where time is concatenated in ever smaller time slots and condensed time sequences. The organisation of appointments into slots of 15 minutes, with or without a break in between, might be a dense schedule, but we have come to think in time as linked to dates, space and precise timing. We shall experience time as rushed or forcing us into concatenated sequences in our professional life more than in our private life. In IT we even integrate these separate columns into just a single column for computing efficiency. Our calendars allow to structure time in ever smaller sequences. We tend to organise our lives more and more according to these shorter concatenated time.

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Multiple clocks

There is nothing more confusing that multiple clocks that are ticking away without being synchronized, which means, they ought to show the same time. A medical and social science perspective on multiple clocks, however, builds on the fact the different social processes run with different speed, i.e. multiple clocks are ticking in parallel but one may be more advanced than the other. The study of longevity has recently acknowledged that each human organ is aging at its own speed and if the time to failure is close for the liver, the time until problems of your heart might still be far off. Overall longevity is determined by the time to failure of a major organ, despite the fact that multiple clocks of organs are running in parallel.
The can be observed for social processes where, for example, the timing of unemployment or retirement might be dependent on a parallel process of a household dissolution causing a peak in stress. Overall life satisfaction, therefore, depends largely on multiple clocks that might be running in a synchronized or not-synchronized manner. Hence, we all live with multiple clocks ticking inside us and around us. The illusion is, to believe that time is just a single, unique measure.

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Time as surprise

Sometimes, time comes as surprise. Time seems to run faster as we perceive it, or time might pass more slowly in actual terms than we perceive or think it does. What makes the difference? There is the objective measure of time with various types of clocks and watches versus the subjective or perceived lapse of time. The discrepancy between the two constitutes an interesting case for further study. Marketing strategies will try to make us believe that a specific kind of product will shorten or lengthen the difference between objective and subjective time. The entertainment industry works very hard on our perception of time relative to one or the other form of entertainment. The best result seems to be that objective time has been much longer than perceived time so that we “lost” our reference to time while being entertained. The so-called social media interaction is rather successful in this form of entertainment, infotainment or edutainment. The moments in life when time comes as a surprise might be great ones in our lives. Particular deviations between objective and subjective time make strong impressions on our memories, too. 

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Time and Emotions

In psychology, time and emotions are a matter of milli- or even nanoseconds. Showing emotions, intrinsic ones or controlled ones is passing rapidly through our brain and, for example, facial muscles. Hence, time plays a role in how we react emotionally to an image or any event. The author Rüdiger Safranski starts his history of the concept of time with the emotional experience that time appears lengthy or tedious. In his view the emotional understanding of the concept of time is key to a better grasp of the philosophical roots of the concept of time. Starting with Greek philosophers, the Stoic tradition, Augustinus, the history of ideas is full of reflections on time, what it does to us, and how we best deal with the effects time has on us. In famous literature from Marcel Proust or Samuel Becket, we were reminded of the creative power of lengthy periods of time and the importance or futility to ask fundamental questions about time and our destiny. Beyond the rational thinking about time, the emotional experience of time makes up much of the spice of life. 

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Time and money

In the English-speaking world, most people will be familiar with the expression “time is money”. In times of working for money as pay, rather than growing your own crops, we calculate hourly, monthly or yearly salaries. Time is a habitual point of reference in production systems and calculations of economic growth. Inflation and depreciation speak to value over time, just as investment and returns accrue over time. For comparisons of different investments the chosen horizon becomes a decisive factor. Of course, in the long run we are all dead, but in the meantime time matters a lot, doesn’t it? Take out a loan and you realize how much time will matter, suddenly. Now, let’s turn around the causality, Money is time or can be buy time with money? For many processes this seems to be the case. With money you can buy time off working, or pay somebody to do work instead of doing the work yourself. You can “win time” or gain more free time this way. However, towards the end of your life, money might no longer suffice to buy you time before death even with lots of disposable income or cash. From a philosophy of science perspective, we might even question the concept of time-linked causality altogether. The relationship between time and money gets even more interesting if. we take intergenerational considerations into account like inheritance and environmental heritage. … and “the times are a changing”.  

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Time measures

We are so used to measure time in discrete ways such as hours, minutes and seconds that we hardly think of time as an uninterrupted continuous process. We say, time is ticking away and use the metronome way of signaling a rhythm as a felt discrete approximation of the continuous progression of time. The count of days, weeks, months, decades and years heightens our presumable, countable grip of time. We measure our heart in terms of beats per minute and evaluate the heart rhythm according to time stamps. We measure waves of the oceans in terms of how many seconds elapse between each wave. Of course speed is measured against discrete time, if we drive at 100 miles per hour or kilometers per seconds for rockets. However, time is continuous. 

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Social time

What does the „social“ have to do with time. Well, time is a perfect case of a social construction or a fundamentally social construct. The definition of time as „Greenwich mean time“ is nothing but a useful socio-political statement to synchronize time across the world, or previously an imperium. Points in time, as shown on a clock(s), can be helpful to synchronize human behavior. We might want to show up on the same point in time to start or end work. Of course there are thousands of ways in which such synchronization might go awfully wrong. This makes for splendid drama and movies have a long history to capture our attention on this matter. Social expectations, a social, psychological, and even a biological concept in extreme cases (Pavlov effect) make many of us to get a bit itchy, if time is getting short to meet other persons or an expected event is going to happen. A lot of social pressure is transmitted through the ticking away of time. The mechanism to internalize social patterns (for example prayer), via time and the clock, is quite powerful and has been used in movies throughout the history of the cinema. Even the individual endpoint in time is in almost all cases a shared social experience and turns into a kind of socially relevant time. (Take your time to watch The Clock by Christian Marclay).

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Art Utopia

Not all art is utopia, but a lot of it. A series of talks on the issue of utopia in art  (BNF) reminds us on the utopian projects many artists have pursued in the history of art. From a non-believer’s point of view, religious depictions belong to some form of utopian art. Much later art movements proposed to bring art closer to people’s lives by spreading decorative art to objects of the daily lives, like furniture, dresses, jewelry. Different forms of experimentation with materials or art styles reveal a taste for freedom of expression, sometimes of a utopian kind, at least at the time of experimenting. Abstract art opens up thought spaces which may appear like verylong shots into a very distant future. Science-fiction is of course a well known form of dealing with and representing utopian ideas to larger audiences. Maybe it is this curated space of utopia which many people seek when going to exhibitions and galleries. (Image: Giovanni Bellini, Resurrection of Christ, Gemäldegalerie Berlin). 

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Art Station

Mobility takes time. All people who travel frequently know the long waiting times at train stations. Be for commuting between places or long distance travel, we can hardly escape from the moments when time gets long and longer. The Paris train station Gare de l’Est has brought art in form of posters to the station as a kind of accessible micro-exhibition. The cooperation with the Petit Palais in Paris allows to give more people a taste or at least an appetizer to art work. Most people rush by, but some spend some minutes reading, inhaling exhaling, and continue to their destination or next date. In the battle for attention such initiatives like art in the station hold societies together. People with very different horizons cross each other for short moments in time.

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Words versus Balls

At the occasion of a visit to the “Deutsche Dom” in Berlin, which hosts the historical exhibition of the “Deutsche Bundestag”, I came across the memorable transcript of the speech by Bundespräsident Steinmeier (Image below), which he gave on 2022-2-13. The German President’s words come across as a forceful defense of freedom and democracy as a matter of mind and heart, and against the authoritarian leaders who keep constructing palaces of ice and golf resorts. (“Mögen die Autoritären doch ihre Eispaläste und Golfressorts bauen. Nichts davon ist stärker, nichts leuchtet heller als die Idee der Freiheit und Demokratie in den Köpfen und Herzen der Menschen!”, p.18). There is indeed an ongoing battle on which kind of diplomacy is more effective, words or playing golf together. Apparently the Finnish prime minister seems to be quite keen to play balls with President Trump on the golf course to ensure continued support of the 1000 km Russian Finnish border. Maybe, playing Ping Pong with the Chinese leadership might be more effective in balancing the trade books between Europe and China, just as much as golfing might do the trick with the current Trump administration. What’s your handicap in the golf and ping pong tournament of  international politics.

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Futures for Amazonia

Diversity is the treasure of humanity. This was and remains a permanent challenge as thinking in multiple perspectives is taxing our minds. Simplicity can be a value in science or mathematical proofs, but cybernetics teach is also about the usefulness of a “requisite variety”. The exhibition Amazonia at the Quai Branly in Paris takes us on a journey through richness of the Amazonas, its people, biodiversity and landscapes. First of all the curators Varison and Baniwa manage to accompany us in opening up our minds to non-western concepts, which have for centuries been considered as less developed, but only from a western point of view or imagined sort of cultural superiority. Even nowadays the West seems to be convinced that for the liberation of, for example Venezuela, only a western power can achieve this. The 300 different indigenous peoples of Amazonia have lived through hundreds of years of threats to preserve their cultures. They have managed and they have inherited and still develop multiple ideas about “futures” of the Amazonas region. In just 100 days this exhibition has reached more than 100.000 visitors. Most of them will be convinced of a future and, yes, futures for Amazonia. 

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Time – The Clock

Time keeps puzzling us. The 24 hours of concatenated clips from well-known cinema films are a bit overwhelming or even lengthy. However, this spurs lots of time to reflect on time, on a kind of meta level. We see the clock or clocks ticking in all sorts of situations and environments. Nearly all emotional states can be interpreted relative to a time stamp provided by a clock. Christian Marclay’s oeuvre is screened at the Neue Nationalgalerie in Berlin at a time when we feel multiple clocks ticking at the same time. For the sociologist, there is time on the macro-societal level, like overall socioeconomic development, but also individual time. A single person or a single moment in time may have very different macro-social implications. The possibility to live through the cineastic interpretations of ten to, as opposed to, ten past the hour, are interpreted by us with very different meanings. In a longer or historical sense, the timing of time does not matter that much. Point in time or time as duration, that is the question. Art in cinema can play with this like rock around The Clock. Don’t ask me how much time I spent watching, thinking and feeling through time in this movie exhibition, Should we always measure time with a clock.  Want it or not, we measured by our smartphones all the time and on multiple timelines.

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Between micro and de-facto state

In political science we distinguish between small, micro-states and territories or regions that are defined as de-facto states. Björn Boman (2025) has put the wealthy states of Monaco, Lichtenstein and San Marino into the micro-states category. On the contrary, Abkhazia, South Ossetia, Donetsk and Luhansk fall under the label of de-facto states with more controlled access as well as under Russian influence using brutal force to control the zone of Russian influence. Due to its size Ukraine as a whole has been able to resist the Russian forces to be degraded to a de-facto state only. The military and technical ingenuity of a well educated workforce allowed the Ukraine leadership to not only counter the Russian invasion, but also to mobilize enormous support from western democracies in form of weapons, financial and humanitarian assistance including millions of refugees over the last 4 years. Size of territory has entered the equation or balance whether to belong to a the micro- or de-facto state category. In the new multipolar international political arena “the sovereign state” has become a more hybrid concept as well. Micro-states have handled the difference between full internal sovereignty and only partial external sovereignty already for years, the new multipolar international arena is being transformed rapidly in this direction. Choose your camp or align with a sufficient number of countries to form an internal and external sovereign area.

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Konzerthaus Organ

In the Espresso Concert series we have had the chance to listen to young talented musicians. On 2026-1-7 Julian Emanuel Becker charmed the audience with 5+1 pieces in the “Großer Saal“ on the Jehmlich Organ (4 manuals, 74 registers, 5811 pipes). The program ranged from Bruhns, Bach, Mendelssohn Bartholdy to 2 pieces by Jehan Alain, which made for an interesting surprise. Mastering this huge Konzerthaus organ with impressive skills at just 20 years of age caught the attention of the Berlin audience including the tourists on visits. The enthusiasm of Julian Emanuel Becker for his instrument and the brief introductions he gave himself to each piece created a unique learning as well as musical experience for the entire audience irrespective of age and prior expertise. The „Espresso addicts“ of the Konzerthaus even took the chance to chat with the young organist to learn more about the marvelous instrument and the next steps in his promising career. The studies in Paris at the Conservatoire have been important steps in the careers of formidable pianists and composers for more than 200 years. Becker will surely return to Berlin to give concerts again. Try to catch a seat, if you can. (Image: Julian Emanuel Becker 2026-1-7 at the Konzerthaus Jehmlich Organ)

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Premium for silence

People are willing to pay a premium on housing prices for a more silent environment. In the study Enrico Moretti & Harrison Wheeler (2025) estimate that the construction of a silencing wall near a noisy traffic junction or road will increase prices for every decibel of noise reduction by about 3%. Distances closer to the noise shields get higher increases and this mechanism works even up to 400 meters away from the isolation. The investment in decibel noise reductions (not statistical noise) meets a willingness to pay a premium on housing prices. Investment in positive environmental effects (silence) have an obvious marketable premium value. This is most likely just the obverse effect that noise nearby housing is penalized and part of the social mechanism of gentrification. Housing prices and rental costs are known to be powerful drivers of gentrification as well.

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Metabolic harm

At the beginning of the 21st century the lack of physical activity for large parts of society has become a major risk of and cause of metabolic harm. We have become used to a sedentary lifestyle and the digital access to distractions and information have encouraged further immobility. Alex Broom et al. (2025) stress the importance to include social and governmental interventions into the many existing medical, pharmacological and technological interventions. The authors advocate a rather holistic approach to really make a difference. The obesity trends cause metabolic harm of an  unprecedented size. We have to rethink mobility patterns and other behavioral changes into our daily routines to bring back more stimulation to our metabolic system.

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Rotational energy

We all know rotational energy from our bicycles. lighting used to come from a small rotational energy source attached to a wheel (dynamo light) which produced sufficient electricity to lighten a front and back light. The use of rotational energy, however, is much older than the application on the bicycles, which have been largely replaced by batteries and LED-lights. The first so-called Post-mills stem from Normandy as well as the Rhine riversides around 1200. It took about 800 years to make a splendid comeback as energy source in the age of the „All electric society“ of the 21st century in the making. The „Deutsche Museum of Technology“ in Berlin has great examples of such rotational energy sources on display in the museum‘s park. You can walk a path through the past and future of rotational energy sources.