Hitachi Energy to accelerate sustainable mobility in Germany's biggest city

Thermoradiative Diode Power leverages infrared radiation and night-sky cooling to harvest waste heat. Using MCT (mercury cadmium telluride) detectors with photovoltaics, it extends renewable energy generation after sunset, exploiting radiative cooling and low-power density.

Key Points

Technology using MCT infrared diodes to turn radiative Earth-to-space heat loss into electricity, aiding solar at night.

✅ MCT diodes radiate to cold sky, generating tiny current at 20 C

✅ Complements photovoltaics by harvesting post-sunset infrared flux

✅ Potential up to one-tenth solar output with further efficiency gains

Conventional solar technology soaks up rays of incoming sunlight to bump out a voltage. Strange as it seems, some materials are capable of running in reverse, producing power as they radiate heat back into the cold night sky environment.

A team of engineers in Australia has now demonstrated the theory in action, using the kind of technology commonly found in night-vision goggles to generate power, while other research explores electricity from thin air concepts under ambient humidity.

So far, the prototype only generates a small amount of power, and is probably unlikely to become a competitive source of renewable power on its own – but coupled with existing photovoltaics technology and thermal energy into electricity approaches, it could harness the small amount of energy provided by solar cells cooling after a long, hot day's work.

"Photovoltaics, the direct conversion of sunlight into electricity, is an artificial process that humans have developed in order to convert the solar energy into power," says Phoebe Pearce, a physicist from the University of New South Wales.

"In that sense, the thermoradiative process is similar; we are diverting energy flowing in the infrared from a warm Earth into the cold Universe."

By setting atoms in any material jiggling with heat, you're forcing their electrons to generate low-energy ripples of electromagnetic radiation in the form of infrared light, a principle also explored with carbon nanotube energy harvesters in ambient conditions.

As lackluster as this electron-shimmy might be, it still has the potential to kick off a slow current of electricity. All that's needed is a one-way electron traffic signal called a diode.

Made of the right combination of elements, a diode can shuffle electrons down the street as it slowly loses its heat to a cooler environment.

In this case, the diode is made of mercury cadmium telluride (MCT). Already used in devices that detect infrared light, MCT's ability to absorb mid-and long-range infrared light and turn it into a current is well understood.

What hasn't been entirely clear is how this particular trick might be used efficiently as an actual power source.

Warmed to around 20 degrees Celsius (nearly 70 degrees Fahrenheit), one of the tested MCT photovoltaic detectors generated a power density of 2.26 milliwatts per square meter.

Granted, it's not exactly enough to boil a jug of water for your morning coffee. You'd probably need enough MCT panels to cover a few city blocks for that small task.

But that's not really the point, either, given it's still very early days in the field, and there's potential for the technology to develop significantly further in the future.

"Right now, the demonstration we have with the thermoradiative diode is relatively very low power. One of the challenges was actually detecting it," says the study's lead researcher, Ned Ekins-Daukes.

"But the theory says it is possible for this technology to ultimately produce about 1/10th of the power of a solar cell."

At those kinds of efficiencies, it might be worth the effort weaving MCT diodes into more typical photovoltaic networks alongside thin-film waste heat solutions so that they continue to top up batteries long after the Sun sets.

To be clear, the idea of using the planet's cooling as a source of low-energy radiation is one engineers have been entertaining for a while now. Different methods have seen different results, all with their own costs and benefits, with low-cost heat-to-electricity materials also advancing in parallel.

Yet by testing the limits of each and fine-tuning their abilities to soak up more of the infrared bandwidth, we can come up with a suite of technologies and thermoelectric materials capable of wringing every drop of power out of just about any kind of waste heat.

"Down the line, this technology could potentially harvest that energy and remove the need for batteries in certain devices – or help to recharge them," says Ekins-Daukes.

"That isn't something where conventional solar power would necessarily be a viable option."

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O2 Tidal Turbine delivers tidal energy in Orkney, Scotland, supplying grid-connected renewable power via EMEC and enabling green hydrogen production, providing clean electricity with predictable generation from strong coastal currents.

Key Points

A 2 MW, grid-connected tidal device in Orkney that delivers clean power and enables EMEC green hydrogen production.

✅ 2 MW capacity; powers ~2,000 UK homes via EMEC grid

✅ Predictable renewable output from strong coastal currents

✅ Enables onshore electrolyzer to produce green hydrogen

“The world’s most powerful” tidal turbine has been hooked up to the onshore electricity grid in Orkney, a northerly archipelago in Scotland, and is ready to provide homes with clean, green electricity, even as a major UK offshore windfarm begins supplying power this week.

The tidal turbine, known as the O2, was developed by Scottish engineering firm Orbital Marine Power. On July 28, they announced O2 “commenced grid connected power generation” at the European Marine Energy Centre (EMEC) in Orkney, meaning it's all set up and providing energy to the local power grid, similar to another Scottish tidal project that recently powered nearly 4,000 homes.

The 74-meter-long (242-foot) turbine is said to be “the world’s most powerful” tidal turbine. It will lay in the waters off Orkney for the next 15 years with the capacity to meet the annual electricity demand of around 2,000 UK homes. The 2MW turbine is also set to power the EMEC’s land-based electrolyzer that will generate green hydrogen (hydrogen made without fossil fuels) that can also be used as a clean energy source, in a UK energy system that recently set a wind generation record for output.

“Our vision is that this project is the trigger to the harnessing of tidal stream resources around the world and, alongside investment in UK offshore wind, to play a role in tackling climate change whilst creating a new, low-carbon industrial sector,” Orbital CEO, Andrew Scott, said in a press release.

Tidal energy is harnessed by converting energy from the natural rise and fall of ocean tides and currents. The O2 turbine consists of two submerged blades with a 20-meter (65-foot) diameter attached to a turbine that will move with the shifting currents of Orkney’s coast to generate electricity. Electricity is then transferred from the turbine along the seabed via cables towards the local onshore electricity network, a setup also being used by a Nova Scotia tidal project to supply the grid today.

This method of harnessing energy is not just desirable because it doesn't release carbon emissions, but it’s more predictable than other renewable energy sources, such as solar or Scotland's wind farms that can be influenced by weather conditions. Tidal energy production is still in its infancy and there are relatively few large-scale tidal power plants in the world, but many argue that some parts of the world could potentially draw huge benefits from this innovative form of hydropower, especially coastal regions with strong currents such as the northern stretches of the UK and the Bay of Fundy in Atlantic Canada.

The largest tidal power operation in the world is the Sihwa Lake project on the west coast of South Korea, which harnesses enough power to support the domestic needs of a city with a population of 500,000 people. However, once fully operational, the MeyGen tidal power project in northern Scotland hopes to snatch its title.

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Electric Vehicles Lower Electricity Rates by boosting demand, enabling fixed-cost recovery, and encouraging off-peak charging that balances the grid, reduces peaker plant use, and funds utility upgrades, with V2G poised to expand system benefits.

Key Points

By boosting off-peak demand and utility revenue, EVs spread fixed costs, cut peaker use, and stabilize the grid.

✅ Off-peak charging flattens load, reducing peaker plant reliance

✅ Higher kWh sales spread fixed grid costs across more users

✅ V2G can supply power during peaks and emergencies

Electric vehicles (EVs) are gaining popularity, and it appears they might be offering an unexpected benefit to everyone – including those who don't own an EV.  A new study by the non-profit research group Synapse Energy Economics suggests that the growth of electric cars is actually contributing to lower electricity rates for all ratepayers.

How EVs Contribute to Lower Rates

The study explains several factors driving this surprising trend:

• Increased Electricity Demand: Electric vehicles require additional electricity, boosting rising electricity demand on the grid.
• Optimal Charging Times: Many EV owners take advantage of off-peak charging discounts. Charging cars overnight, when electricity demand is typically low, helps to balance state power grids and reduce the need for expensive "peaker" power plants, which are only used to meet occasional spikes in demand.
• Revenue for Utilities: Electric car charging can generate substantial revenue for utilities, potentially supporting investment in grid improvements, energy storage solutions and renewable energy projects that can bring long-term benefits to all customers.

A Significant Impact

The Synapse Energy Economics study analyzed data from 2011 to 2021 and concluded that EV drivers already contributed over $3 billion more to the grid than their associated costs. That, in turn, reduced monthly electricity bills for all customers.

Benefits May Grow

While the impact on electricity rates has been modest so far, experts anticipate the benefits to grow as EV adoption rates increase. Vehicle-to-grid (V2G) technology, which allows EVs to feed stored power back into the grid during emergencies or high-demand periods, has the potential to further optimize electricity usage patterns and create additional benefits for electric utilities and customers.

National Implications

The findings of this study offer hope to other regions seeking to increase electric vehicle adoption rates and support California's grid stability efforts, which is a key step towards reducing transportation-related greenhouse gas emissions. This news may alleviate concerns about potential electricity rate hikes driven by EV adoption and suggests that the benefits will be broadly shared.

More than Just Environmental Benefits

Electric vehicles bring a clear environmental advantage by reducing reliance on fossil fuels. However, this unexpected economic benefit could further strengthen the case for accelerating the adoption of electric vehicles. This news might encourage policymakers and the public to consider additional incentives or policies, including vehicle-to-building charging approaches, to promote the transition to this cleaner mode of transportation knowing it can yield benefits beyond environmental goals.

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UK EV Grid Capacity leverages smart charging, V2G, renewable energy, and interconnectors to manage peak demand as adoption grows, with National Grid upgrades, rapid chargers, and efficiency gains enabling a reliable, scalable charging infrastructure nationwide.

Key Points

UK EV grid capacity is the power network's readiness to meet EV demand using smart charging, V2G, and upgrades.

✅ Smart charging shifts load to off-peak, cheaper renewable hours

✅ V2G enables EVs to supply power and balance peak demand

✅ National Grid upgrades and interconnectors expand capacity

The surge of electric vehicles (EVs) on our roads raises a crucial question: can the UK's electricity grid handle the additional demand? While this is a valid concern, it's important to understand the gradual nature of EV adoption, ongoing grid preparations, and innovative solutions being developed.

A Gradual Shift, Not an Overnight Leap

Firstly, let's dispel the myth of an overnight transition. EV adoption will unfold progressively, driven by factors like affordability and the growing availability of used models. The government's ZEV mandate outlines a clear trajectory, with a gradual rise from 22% EV sales in 2024 to 80% by 2030. This measured approach allows for strategic grid improvements to accommodate the increasing demand.

Preparing the Grid for the Future

Grid preparations for the EV revolution have been underway for years. Collaborations between the government, electricity providers, service stations, and charging point developers are ensuring grid coordination across the system. Renewable energy sources like offshore wind farms, combined with new nuclear power and international interconnections, are planned to meet the anticipated 120 terawatt-hour increase in demand. Additionally, improvements in energy efficiency have reduced overall electricity consumption, creating further capacity.

Addressing Peak Demand Challenges

While millions of EVs charging simultaneously might seem like they could challenge power grids, solutions are being implemented to manage peak demand:

1. Smart Charging: This technology allows EVs to charge during off-peak hours when renewable electricity is abundant and cheaper. This not only benefits the grid but also saves owners money. The UK government's EV Smart Charge Points Regulations ensure all new chargers have this functionality.

2. Vehicle-to-Grid (V2G) Technology: This futuristic concept transforms EVs into energy storage units, often described as capacity on wheels, allowing owners to sell their unused battery power back to the grid during peak times. This not only generates income for owners but also helps balance the grid and integrate more renewable energy.

3. Sufficient Grid Capacity: Despite concerns, the grid currently has ample capacity. The highest peak demand in recent years (62GW in 2002) has actually decreased by 16% due to energy efficiency improvements. Even with widespread EV adoption, the expected 10% increase in demand remains well within the grid's capabilities with proper management in place.

National Grid's Commitment:

National Grid and other electric utilities are actively involved in upgrading and expanding the grid to accommodate the clean energy transition. This includes collaborating with distribution networks, government agencies, and industry partners to ensure the necessary infrastructure (wires and connections) is in place for a decarbonized transport network.

Charging Infrastructure: Addressing Anxiety

The existing national grid infrastructure, with its proximity to roads and train networks, provides a significant advantage for EV charging point deployment. National Grid Electricity Distribution is already working on innovative projects to install required infrastructure, such as:

• Bringing electricity networks closer to motorway service areas for faster and easier connection.
• Leading projects like the Electric Boulevard (inductive charging) and Electric Nation (V2G charging) to showcase innovative solutions.
• Participating in the Take Charge project, exploring new ways to facilitate rapid EV charging infrastructure growth.

Government Initiatives:

The UK government's Rapid Charging Fund aims to roll out high-powered, open-access charge points across England, while the Local EV Infrastructure Fund supports local authorities in providing charging solutions for residents without off-street parking, including mobile chargers for added flexibility.

While the rise of EVs presents new challenges, the UK is actively preparing its grid and infrastructure to ensure a smooth transition. With gradual adoption, ongoing preparations, and innovative solutions, the answer to the question Will electric vehicles crash the grid? is a resounding yes. The future of clean transportation is bright, and the grid is ready to power it forward.

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Germany Renewable Energy Milestone marks renewables supplying 53% of power, with record onshore wind and peak solar; hydrogen-ready gas plants and grid upgrades are planned to balance variability amid Germany's coal phase-out.

Key Points

It marks renewables supplying 53% of Germany's power, driven by wind and solar records in the energy transition.

✅ 53% of generation and 52% of consumption in 2024

✅ Onshore wind hit record; June solar peaked

✅ 24 GW hydrogen-ready gas plants planned for grid balancing

For the first time, renewable energy sources have surpassed half of Germany's electricity production this year, as indicated by data from sustainable energy organizations.

Preliminary figures from the Center for Solar Energy and Hydrogen Research alongside the German Association of Energy and Water Industries (BDEW) show that the contribution of green energy has risen to 53%, echoing how renewable power surpassed fossil fuels in Europe recently, a significant increase from 44% in the previous year.

The year saw a record output from onshore wind energy, as investments in European wind power climbed, and an unprecedented peak in solar energy production in June, as reported by the organizations. Additionally, renewable sources constituted 52% of Germany's total power consumption, marking an increase of approximately five percentage points.

Germany, Europe's leading economy, heavily impacted by Russia's reduced natural gas supplies last year, as Europeans push back from Russian oil and gas across the region, has been leaning on renewable sources to bridge the energy gap. This shift comes even as the country temporarily ramped up coal usage last winter. Having phased out its nuclear power plants earlier this year, Germany aims for an 80% clean energy production by 2030.

In absolute numbers, Germany produced a record level of renewable energy this year, supported by a solar power boost during the energy crisis, approximately 267 billion kilowatt-hours, according to the associations. A decrease of 11% in overall energy production facilitated a reduced reliance on fossil fuels.

However, Europe's transition to more sustainable energy sources, particularly offshore wind, has encountered hurdles such as increased financing and component costs, even as neighbors like Ireland pursue an ambitious green electricity goal within four years. Germany continues to face challenges in expanding its renewable energy capacity, as noted by BDEW’s executive board chairwoman, Kerstin Andreae.

Andreae emphasizes that while energy companies are eager to invest in the transition, they often encounter delays due to protracted approval processes, bureaucratic complexities, and scarcity of land despite legislative improvements.

German government officials are close to finalizing a strategy this week for constructing multiple new gas-fired power plants, despite findings that solar plus battery storage can be cheaper than conventional power in Germany, a plan estimated to cost around 40 billion euros ($44 billion). This initiative is a critical part of Germany's strategy to mitigate potential power shortages that might result from the discontinuation of coal power, particularly given the variability in renewable energy sources.

A crucial meeting involving representatives from the Economy and Finance Ministries, along with the Chancellor's Office, is expected to occur late Tuesday. The purpose is to finalize this agreement, according to sources who requested anonymity due to restrictions on public disclosure.

The Economy Ministry, spearheading this project, confirmed that intensive discussions are ongoing, although no further details were disclosed.

Germany's plan involves utilizing approximately 24 gigawatts (GW) of energy from hydrogen, including emerging offshore green hydrogen options, and gas-fired power plants to compensate for the fluctuations in wind and solar power generation. However, the proposal has faced challenges, particularly regarding the allocation of public funds for these projects, with disagreements arising with the European Union's executive in Brussels.

Environmental groups have also expressed criticism of the strategy. They advocate for an expedited end to fossil fuel usage and remain skeptical about the energy sector's arguments favoring natural gas as a transitional fuel. Despite natural gas emitting less carbon dioxide than coal, environmentalists question its role in Germany's energy future.

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Germany Hydrogen Fuel Cell Market gains momentum as policy, mobility, and R&D align; National Hydrogen Strategy, regulatory frameworks, and cost-of-ownership advances boost heavy transport, while Europe races Asia amid battery-electric competition and infrastructure scale-up.

Key Points

It is Germany and Europe's hydrogen fuel cell ecosystem across policy, costs, R&D, and mobility and freight deployments.

✅ Policy support via National Hydrogen Strategy and tax incentives

✅ TCO parity improves for heavy transport vs other low-emission tech

✅ R&D targets higher temps, compactness for road, rail, sea, air

In a new report examining the status of the German and European hydrogen fuel cell markets, the German government-backed National Platform Future of Mobility (NPM) says there is “a good chance that fuel cell technology can achieve a break-through in mobile applications,” even as the age of electric cars accelerates across markets.

However, Europe must catch up with Asian countries, it adds, even as a push for electricity shapes climate policy. For Germany and Europe to take on a leading role in fuel cell technologies, their industries need to be strengthened and sustainably developed, the report finds. In its paper, the NPM Working Group 4 – which aims to secure Germany as a place for mobility, battery cell production, recycling, training and qualification – states that the “chances of fuel cell technology achieving a break-through in the automotive industry – even in Europe – are better than ever,” echoing recent remarks from BMW's chief about hydrogen's appeal.

The development, expansion and use of the technology in various applications are now supported by “a significantly modified regulatory framework and new political ambitions, as stipulated in the National Hydrogen Strategy,” while updated forecasts show e-mobility driving electricity demand in Germany, the report stresses. In terms of cost of ownership, “hydrogen solutions can hold their own compared to other technologies” and there are “many promising developments in the transport sector, especially in heavy transport.”

If research and development efforts can help optimise installation space and weight as well as increase the operating temperature of fuel cells, hydrogen solutions can also become attractive for maritime, rail and air transport, even as other electrochemical approaches, such as flow battery cars, progress, the report notes. Tax incentives -- such as the Renewable Energy Sources Act (EEG) surcharge exemption for green hydrogen -- can contribute to the technology’s appeal, it adds.

Fuel cell drives are often seen as a way to decarbonise certain areas of transport, such as heavy trucks. However, producing the hydrogen in a sustainable way consumes a lot of renewable electricity that power companies must supply in other sectors, and experts say electricity vs hydrogen trade-offs favor battery-electric trucks because they are much cheaper to run than other low-emission technologies, including fuel cells.

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