Smart cities come in all shapes and sizes, incorporating everything from smart grid solutions to renewable energy generation
In this week’s Top 10, we shine a light on the cutting-edge energy-efficient initiatives of cities like Amsterdam, Tokyo, Seoul, Barcelona, Oslo and more
The concept of the smart city emerged in the early 21st century as urban planners and technologists began to think about how digital infrastructure could transform metropolitan life.
At its core, a smart city leverages data, connectivity and intelligent systems to enhance quality of life, optimise resource use and reduce environmental impact.
In 2026, the model smart city integrates ideas as disparate as renewable energy grids, AI-driven traffic management, IoT sensors and citizen engagement platforms to create more sustainable, efficient urban environments.
Some of the latest trends in smart cities include energy-positive districts, vehicle-to-grid integration and hyperlocal renewable microgrids.
With climate concerns intensifying and urban populations swelling, smart cities represent the kind of necessary innovation the world needs.
Looking ahead, tomorrow's cities will likely feature autonomous energy systems that predict and adapt to demand, buildings that generate more power than they consume, and seamless integration between transport, energy and communication networks, creating urban ecosystems that are truly regenerative.
- Amsterdam, The Netherlands
- Population: 921,000
- Mayor: Femke Halsema
- Company in focus: Schneider Electric
- Notable feature: Vehicle-to-grid technology integration
The city's innovative vehicle-to-grid programme allows electric vehicles to feed surplus power back into the municipal grid during peak demand periods, effectively transforming thousands of cars into mobile battery storage units.
Amsterdam's smart grid infrastructure monitors energy consumption across residential and commercial sectors in real time, enabling dynamic pricing and load balancing.
The city has committed to becoming completely carbon neutral by 2050, with renewable energy accounting for an increasingly substantial proportion of its power mix through offshore wind farms and solar installations integrated into new developments.
- Copenhagen, Denmark
- Population: 644,000
- Mayor: Sophie Hæstorp Andersen
- Company in focus: Hitachi
- Notable feature: District heating system powered by waste incineration
Copenhagen's smart city credentials rest substantially upon its world-leading district heating network, which supplies 98% of the city with hot water and heating through an interconnected pipe system.
This infrastructure captures waste heat from power generation and industrial processes, dramatically reducing energy waste.
The city employs sophisticated sensors and AI algorithms to predict heating demand based on weather patterns, occupancy data and historical consumption, optimising energy distribution across the network.
Copenhagen's commitment to becoming the world's first carbon-neutral capital by 2025 has driven extensive integration of wind power, biomass energy and innovative thermal storage solutions that balance supply and demand across daily and seasonal cycles.
- Singapore
- Population: 5,920,000
- Mayor: Desmond Tan (Mayor of Central District)
- Company in focus: Siemens
- Notable feature: Solar panel deployment across HDB estates
Despite its limited land area and natural resources, the city-state of Singapore has become a global leader in urban sustainability thanks to its ambitious solar energy programmes, particularly across its public housing estates, where the majority of Singaporeans reside.
Singapore's smart grid infrastructure incorporates advanced metering, demand response systems and energy storage facilities that manage the intermittent nature of solar generation.
The city's Energy Market Authority has also introduced regulatory frameworks allowing peer-to-peer energy trading within housing estates, creating localised energy marketplaces that incentivise efficiency and renewable adoption.
- Barcelona, Spain
- Population: 1,660,000
- Mayor: Jaume Collboni
- Company in focus: Cisco
- Notable feature: IoT-enabled street lighting system
The Catalan metropolis of Barcelona has embraced digital transformation in the 21st century, with a particular emphasis on energy-efficient public services.
The city's intelligent street lighting network employs motion sensors and adaptive controls that adjust brightness based on pedestrian and vehicular activity, reducing electricity consumption by approximately 30%.
Beyond lighting, Barcelona has installed thousands of IoT sensors across the city to monitor air quality, noise levels, traffic flow and energy usage in public buildings. This data feeds into centralised management platforms that enable evidence-based policy decisions and operational optimisations.
The city's “Superblocks” programme redesigns neighbourhoods to prioritise pedestrians and cyclists – reducing transport-related energy consumption while also improving liveability.
- Oslo, Norway
- Population: 709,000
- Mayor: Anne Lindboe
- Company in focus: Fortum
- Notable feature: Electric vehicle adoption exceeding 30% of all vehicles
Oslo is perhaps the world's most successful case study in EV adoption.
More than 30% of vehicles in the Norwegian capital are now electric, supported by the city’s extensive charging infrastructure and generous incentives.
Oslo benefits enormously from Norway's abundant hydroelectric resources, meaning all the EVs operate on essentially carbon-free electricity.
The city management team has set up smart charging systems that encourage off-peak charging when renewable generation is highest and grid demand lowest, helping drivers and the planet at once.
- Tokyo, Japan
- Population: 14,050,000
- Mayor: Yuriko Koike
- Company in focus: Toshiba
- Notable feature: Hydrogen fuel cell technology deployment
Tokyo's smart city strategy is all about resilience, efficiency and technological innovation. Following the Fukushima nuclear disaster in 2011, Tokyo sped up its commitment to using distributed energy resources and smart grid technologies.
The city has become a testbed for hydrogen fuel cell technology, with buses, buildings and even whole residential developments incorporating hydrogen systems as part of Japan's broader hydrogen society vision.
Tokyo's smart grid infrastructure employs sophisticated forecasting algorithms and real-time monitoring across its vast metropolitan area, managing demand from millions of households and businesses.
- San Diego, USA
- Population: 1,390,000
- Mayor: Todd Gloria
- Company in focus: GE Digital
- Notable feature: Microgrid deployment in critical facilities
San Diego has emerged as North America's foremost smart city, particularly regarding energy innovation and grid modernisation.
The city's climate action plan commits to powering 100% of municipal operations with renewable energy, driving extensive solar deployment and energy storage integration.
San Diego has pioneered microgrid technology, installing resilient distributed energy systems at critical facilities including emergency services, water treatment plants and community centres.
These microgrids can operate independently during grid outages, ensuring continuity of essential services during emergencies.
The city has invested over US$30m in intelligent street lighting that incorporates sensors for environmental monitoring, creating a citywide IoT platform.
- Seoul, South Korea
- Population: 9,410,000
- Mayor: Oh Se-hoon
- Company in focus: Samsung
- Notable feature: Integrated renewable energy management system across 420,000 buildings
Seoul's transformation into a smart city is a perfect example of how even the densest of megacities can dramatically reduce their energy consumption with the right combination of tech and policy.
The Seoul Energy Corporation manages an integrated renewable energy platform connecting over 420,000 buildings, enabling real-time monitoring and optimisation of energy use across residential, commercial and public sectors.
The city has fitted solar panels on thousands of public buildings, created renewable energy cooperatives allowing residents to invest in and benefit from local generation, and has implemented district-scale energy management systems in redevelopment areas.
Seoul's "One Less Nuclear Power Plant" initiative successfully reduced energy demand equivalent to one nuclear reactor's output through efficiency improvements, renewable deployment and behavioural change programmes.
- Songdo, South Korea
- Population: 170,000
- Mayor: Yoo Jeong-bok (Incheon Metropolitan City)
- Company in focus: Cisco
- Notable feature: Pneumatic waste collection system eliminating waste transportation energy
Songdo is perhaps the world's most ambitious purpose-built smart city, designed from inception with integrated digital infrastructure and sustainable systems in mind.
Located on reclaimed land near Incheon, construction on the planned city began in earnest in 2003 and isn’t expected to be completed until 2030.
With the benefit of foresight, Songdo has been able to incorporate renewable energy generation, intelligent building management systems and district-wide efficiency measures into construction that would be simply impossible to retrofit in existing urban environments.
Perhaps most innovative is Songdo's pneumatic waste collection system, which transports refuse through underground pipes to processing facilities, eliminating the energy consumption and emissions associated with traditional waste collection vehicles.
- Masdar City, UAE
- Population: 15,000
- Company in focus: Masdar
- Notable feature: 100% renewable energy operations
Masdar City is one of the most radical experiments in sustainable urban development ever devised.
It is a carbon-neutral, zero-waste city powered entirely by renewable energy in the heart of Abu Dhabi's desert.
Construction began in 2006, this purpose-built development employs every available technology to minimise energy consumption and maximise renewable generation.
A 10MW solar photovoltaic plant provides the city's electricity, supplemented by one of the Middle East's largest rooftop solar installations.
The buildings of Masdar City incorporate both traditional Middle Eastern design principles and cutting-edge materials, meaning they are able to be cooled with 40% less energy than conventional construction.
Masdar hosts the International Renewable Energy Agency headquarters and numerous clean technology companies, creating an ecosystem where energy innovation is both researched and well embedded in the very fabric of the city.
The city’s extreme climate makes achievements in energy efficiency all the more remarkable, offering lessons for cities worldwide facing rising temperatures.
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Autor(en)/Author(s): James Darley
Dieser Artikel ist neu veröffentlicht von / This article is republished from: Energy Digital, 21.01.2026
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