Balcony energy storage has truly taken off. In just three years, balcony energy storage has evolved from a niche category into a dark horse in the energy market. By 2025, the global market size for balcony PV storage exceeded 13.7 billion RMB, with a compound annual growth rate (CAGR) of over 200% between 2020 and 2025—significantly outperforming the broader residential energy storage market—and this strong growth momentum has continued into 2026. To understand the source of this growth, one must first identify exactly where the market for balcony energy storage lies.   I. Why Balcony Energy Storage Took Off in Europe First Currently, the balcony energy storage market is concentrated in Europe, with Germany serving as the pivotal hub. Germany’s early success in this sector was no accident; several key factors drove it. High electricity prices were the most immediate catalyst. Following regional conflicts in 2022, retail electricity prices in Europe surged; at one point, residential electricity prices in Germany more than tripled compared to 2020 levels. Although prices retreated somewhat by 2025, intraday volatility increased significantly. The market now sees an average intraday price spread of €130 per megawatt-hour (MWh), and the total duration of negative electricity prices has reached approximately 575 hours annually—nearly double the figure from 2020. For ordinary households, price volatility creates uncertainty regarding electricity costs; consequently, balcony-based solar-plus-storage systems—which allow for self-generation and self-consumption—naturally became a tool to hedge against these fluctuations. Regulatory easing was the spark that truly ignited the market. In May 2024, Germany passed the "Solar Package" (Photovoltaic Package) legislation, which removed three major barriers in one fell swoop: "plug-and-play" systems under 800W no longer require prior approval and only need a simple online registration after installation; tenants were granted explicit installation rights, with balcony solar systems classified as "privileged equipment"—on par with EV charging stations and accessibility facilities—meaning landlords and homeowners' associations cannot arbitrarily block their installation; and the 19% VAT was waived, with no personal income tax levied on earnings from self-generated electricity. By January 2025, Germany had raised the power output limit to 1,200W and included energy storage modules in subsidized loan programs for residential energy-efficiency upgrades, allowing households to secure up to €1,500 in interest-free loans. Demand surged quickly following the policy implementation. In 2024, Germany added approximately 435,000 balcony solar units, accounting for 44% of the country's new solar installations that year; by the end of 2025, cumulative registrations surpassed 1.33 million units—a fourfold increase in just two years. Alongside the rapid expansion...

The United States has dealt another devastating blow to Chinese photovoltaic (PV) companies expanding into overseas markets. On September 11 (local time), the U.S. Department of Commerce issued a final affirmative determination, ruling that crystalline silicon photovoltaic cells and modules (whether or not assembled into modules) from India, Indonesia, and Laos were being dumped in the U.S. at less than fair value and were benefiting from unfair government subsidies. Based on this, the Department of Commerce established high anti-dumping (AD) and countervailing duty (CVD) rates. Specifically, the combined duty rates reached 233.26% for India, a maximum of 268.06% for Indonesia, and a peak of 218.7% for Laos. This final ruling—dubbed "Solar IV" by the industry—is more than just a set of figures; it is a declaration of intent. The U.S. is shifting from country-level tariffs to product-level tariffs, aiming to block PV products that reach the U.S. market via third-country transshipment. To understand the full picture of this ruling, it is helpful to look at the details. "Solar IV" marks the fourth major trade remedy action initiated by the U.S. against PV products. The duty rates warrant a detailed breakdown. Regarding anti-dumping duties, the rates are set at a uniform 123.04% for India, 94.36% for Indonesia, and 65.43% for Laos. For countervailing duties, the rates are 126.09% for India, as high as 173.70% for Indonesia’s PT Blue Sky Solar Indonesia, and 153.67% for Vietnam Sunergy Joint Stock Company in Laos. When the two duties are combined, the total rate reaches 268.06% for Indonesia’s Blue Sky Solar and 218.7% for Laos’s Vietnam Sunergy. It is worth noting that several of these rates were determined based on the "adverse facts available" rule; this means that because certain companies under investigation did not fully cooperate, the U.S. Department of Commerce utilized presumptive data unfavorable to the investigated parties. Consequently, these exorbitantly high rates contain a punitive element. Even more significant is the fact that the list of companies subject to duties in Laos prominently includes the Laotian subsidiaries of JA Solar and Trina Solar. The origins of this latest round of tariff hikes date back to July 17, 2025, when the American Alliance for Solar Manufacturing Trade Committee—comprising First Solar, Hanwha Qcells USA, and Mission Solar Energy—initiated the "Solar IV" trade investigation. This probe alleged that photovoltaic (PV) products from India, Indonesia, and Laos were subject to dumping and unfair government subsidies. At its core, the Solar IV case is not merely a trade remedy measure but a move to protect the return on investment for domestic U.S. manufacturing capacity. Since the passage of the Inflation Reduction Act, companies like First Solar have invested billions of dollars in new factories; however, following the imposition of tariffs on four Southeast Asian nations...

Exporting lithium batteries may soon require an additional procedural step. Recently, CINS (Cargo Incident Notification System), a safety organization within the container shipping industry, issued a set of recommendations regarding the maritime transport of lithium-ion batteries. The document proposes that even lithium-ion battery shipments currently exempt under the IMDG Code’s Special Provision 188 (SP188)—and thus not subject to full dangerous goods declaration procedures—should be included in the scope of mandatory declarations. While this may appear to be merely a suggestion for an extra administrative step, the implications are far more complex for the lithium battery industry, which relies heavily on maritime exports.   01. Why impose stricter controls on lithium batteries? Let us first examine the core of the CINS proposal. In short, it boils down to two points: First, mandatory declaration for all shipments containing lithium batteries. Regardless of whether they meet the SP188 exemption criteria, all such shipments must be declared as dangerous goods. Even if the gross weight of a single container is 20 kg or less, a mandatory declaration is required. Second, a 20 kg upper limit on the total weight of lithium batteries per container. Shipments exceeding this weight must comply with relevant IMDG regulations and be declared as dangerous goods. It is important to emphasize that these are currently industry recommendations, not yet binding global regulations. So, why is CINS calling for mandatory declarations now? To understand this, we must look at the rule itself. SP188 is a special provision within the *International Maritime Dangerous Goods (IMDG) Code*, originally designed to simplify transport for certain low-capacity, low-risk lithium battery products. Lithium-ion cells and battery packs that meet specific criteria—such as a rated energy of no more than 20 Wh per cell or 100 Wh per pack—and comply with requirements like UN38.3 testing, short-circuit prevention, and standardized packaging, are eligible for exemptions from standard dangerous goods transport regulations. In layman's terms, items such as a single 18650 cell, a laptop battery, or a power bank do not require a dangerous goods declaration, provided they meet the regulations. The issue is that the scale of lithium battery transport has changed dramatically. Lithium batteries have expanded far beyond consumer electronics like mobile phones and computers into sectors such as new energy vehicles, energy storage systems, and power tools, resulting in a significant increase in battery shipments by sea. Furthermore, if a lithium battery undergoes thermal runaway, it can trigger fires and explosions and poses a risk of re-ignition, making firefighting and emergency response on ocean-going vessels significantly more difficult. Shipping safety data suggests that these concerns are well-founded. The *Safety and Shipping Review 2026* published by Al...

The Spanish government has unveiled plans to require data centres to have at least 80% of their hourly generation be powered by renewable energy.   Announced earlier this week during a council of Ministers, the Spanish government is working on a regulation (called a real decreto in Spanish) to regulate the requirements regarding energy and environmental sustainability, resilience and digital sovereignty applicable to data centres with a power output over 1MW.   The regulation would therefore require data centres to install new renewable energy on a 1:1 basis. Every new megawatt consumed must be matched by a new megawatt of renewable energy capacity installed within the 18 months prior to the facility’s operational start. This can be through self-consumption or a power purchase agreement (PPA).   According to the Spanish Ministry of Ecological Transition (MITECO), its Artificial Intelligence Strategy forecasts nearly 2.5GW of computing power by 2030. These projects would require an electricity demand between 3.5GW and 4GW. The reality is that since 2021, Spain has awarded over 12GW of grid access and connection rights for these types of facilities.   José Donoso, general director of trade body the Spanish Photovoltaic Union (UNEF), welcomed the measure, although he called for the inclusion of energy storage hybridisation.   “It is positive for data centres to be supplied by renewables, but requiring the entire supply to come from new capacity makes no sense given the high levels of technical and economic curtailment. There should be a balance, and the inclusion of hybridised storage should be permitted,” said Donoso.   Drafted by several ministries, including MITECO, the regulatory proposal is currently open for public consultation (in Spanish) until 4 September 2026.   The regulatory proposal also includes measures regarding resilience and digital sovereignty—such as the requirement that centre operations and the control of associated data be handled by entities subject to EU law—as well as measures concerning environmental and energy sustainability.   Spain follows Australia’s footsteps Spain’s approach towards data centres and renewables is somewhat similar to Australia’s. Last month, Australian Prime Minister Anthony Albanese said that large-scale data centres will be legally required to put at least as much energy into the grid as they draw from it, and that this new energy should be renewables.   In the US, the Trump administration’s approach to that issue has been different. In March 2026, seven tech companies – Amazon, Google, OpenAI, Meta, Microsoft, Oracle and xAI – had signed a pledge to build, bring, or buy the energy required to build and operate data centres, with no obligation that the energy come from renewables.

The Australian and New South Wales (NSW) governments have jointly committed AU$2.5 billion (US$1.63 billion) to secure the future of the Tomago Aluminium smelter.   The deal will see a shift to renewable energy, expected to unlock several gigawatts of new wind, solar and battery storage capacity across the state.   Announced on 13 August by Prime Minister Anthony Albanese and NSW Premier Chris Minns, the package delivers a long-term renewable energy solution for the smelter, which is Australia’s largest single electricity user, accounting for around 950MW of near-constant demand, roughly 10% of the state’s total electricity consumption.   Tomago Aluminium, jointly owned by Rio Tinto, Gove Aluminium Finance and Norsk Hydro, has agreed to invest at least AU$1.1 billion of its own capital as part of the deal, including AU$100 million directed toward decarbonisation activities and a demand-response programme intended to position the smelter as an international leader in grid flexibility services.   Under the arrangement, the NSW government’s contribution is capped at AU$1.225 billion over ten years from 2029, with the Commonwealth providing an equivalent share.   The deal secures Tomago’s operation beyond the expiry of its current electricity supply contract on 31 December 2028, running through to 2038 under a new ten-year power purchase agreement (PPA), with electricity supplied to the smelter set to come entirely from renewable energy generation from 2033.   Unlocking a stalled renewable energy pipeline Federal energy minister Chris Bowen said the joint investment would help bring on close to 3GW of renewable energy generation and firming capacity, working alongside the Clean Energy Finance Corporation (CEFC) and Snowy Hydro to draw on projects already in the development pipeline, some of which have secured environmental approval but have yet to reach a final investment decision.   Bowen said the generation mix would include both wind farms and solar backed by battery energy storage systems (BESS), spread predominantly across NSW rather than concentrated in the Hunter region itself.   Analysis commissioned by the Electrical Trades Union (ETU) NSW/ACT from Energy & Resource Insights found that securing Tomago could unlock between AU$8 billion and AU$10 billion in renewable energy investment and support between 2,400 and 3,900 direct jobs during peak construction.   The analysis identified an existing pipeline of 12.3GW of renewable energy and battery projects with development approvals outside the state’s major Renewable Energy Zones (REZs), alongside a further 10.7GW of projects holding access rights in the South West and Central-West Orana Renewable Energy Zones.   The deal follows a similar arrangement Rio Tinto secured in Queensland to repower its Boyne Island aluminium smelter and associated Gladstone refineries, where the company lined up more than AU$7 billion...

The European Commission has released its final Electrification Action Plan, a series of steps that intend to “make Europe the world’s first ‘electro-continent’,” according to commission president Ursula von der Leyen   The plan, which was leaked last week, aims for an electrification rate of 46% by 2040, double the current figure of 23% at which the EU has “stalled” over the last decade. In effect, this means Europe will redouble its efforts to build grid infrastructure and ensure bills are reduced. The commission noted that 70% of EU electricity is now generated from “homegrown clean energy sources”, and solar PV alone accounted for one-quarter of the EU’s domestic power generation last month.   “The best way to reduce Europe’s fossil energy dependency is to power our economy with electricity from clean, homegrown sources,” said von der Leyen. “Today we are proposing to make Europe the world’s first electro-powered continent.”   Cutting bills is a key part of the Electrification Action Plan, and will be driven by continued deployment of renewable energy and a reduction in reliance on fossil fuel imports. The commission estimates that meeting the 46% electrification ate target will cut the EU’s fossil fuel import bill by €260 billion (US$297.2 billion) per year by 2040.   Indeed, the plan “encourages Member States to take actions” to ensure that the cost of domestic electricity bills is no more than two-and-a-half times the cost of gas, and no more than twice the price for industrial users, by 2030.   While the commission does not provide further details on the actions that could be taken to achieve this goal, other reporting suggests that more ambitious deployment of solar PV and battery energy storage systems (BESS) could make a significant impact on this target; earlier this year, a report from SolarPower Europe found that more deployments of the technologies could cut energy bills by 49% by the end of the decade.   ‘Europe’s future runs on electricity’ “Europe’s future runs on electricity,” said SolarPower Europe CEO Walburga Hemetsberger, in response to the publication of the plan. “The commission has also taken important steps towards correcting the tax imbalance between electricity and fossil fuels, and recognising battery storage, flexibility and smarter grid use in network tariffs as essential pillars of a competitive and affordable energy system.”   However, she added that meeting Europe’s electrification target will require “clear investment and financial support,” through mechanisms like the Emissions Trading System (ETS), for which the commission also made new provisions last week.   This includes a new linear reduction factor (LRF)—the rate at which the ETS cap on annual carbon emissions reduces each year&...

Another residential solar power system malfunctioned! According to the Rostock Police Headquarters in Germany, a fire broke out at 3 PM on July 5th in a wooden shed within the yard of a detached house in Bentwisch. The investigation indicates that a battery storage module in an installed solar power system inside the shed overheated and ignited the fire. An explosion occurred during firefighting efforts, blowing off the roof and causing the entire structure to collapse. Three volunteer firefighters sustained minor injuries from the explosion. Flying debris also damaged two adjacent properties. The estimated damage is approximately €40,000. Following the incident, police cordoned off the scene. The fire department deployed an excavator and a large water tank to submerge the exploded battery debris in water to prevent further chemical reactions. A total of 75 firefighters from five volunteer fire brigades—Bentwig, Klein Kussewitz, Mönchhagen, Poppendorf, and Rövershagen—were deployed to the rescue operation. The prosecutor's office has ordered the dispatch of experts to determine the cause of the fire, and the criminal police have opened an investigation. Regarding the explosion, Jörg Westphal, deputy captain of the Neustrelitz volunteer fire brigade, explained that photovoltaic equipment is unique in that, in addition to conventional alternating current, it also contains a direct current circuit, with current flowing from the photovoltaic modules to the inverter. Furthermore, this power generation system continuously produces electricity based on real-time sunlight intensity. Based on the situation, the explosion was most likely caused by overcharging of the photovoltaic-energy storage system. (Photovoltaic overcharge explosions typically refer to explosions caused by thermal runaway of the energy storage battery due to overcharging in a "photovoltaic + energy storage" system. The core causes are often electrical system malfunctions or battery management failures.)   Residential photovoltaic-energy storage system explodes twice in two years! This explosion of a photovoltaic system in a German villa is not an isolated incident. Just last year, also in Germany, a villa with a photovoltaic system experienced an explosion. Around February last year, a serious explosion occurred in Schleswig-Holstein, Germany. A residential building was severely damaged; photos from the scene show significant damage to the exterior walls. The local volunteer fire brigade reported: "A loud bang, followed by a pressure wave. Then thick smoke rose." It is understood that although multiple parts of the building caught fire, the fire was quickly brought under control. Fortunately, the severely damaged building was vacant at the time of the incident, but it may be demolished later. It is understood that this was a detached villa equipped with photovoltaic (PV) and energy storage facilities. According to NDR (North German Broadcasting), pr...

German solar PV generation has continued to grow in the first half of 2026, reaching a new all-time high of 43.2TWh. This is according to an analysis by the Fraunhofer Institute for Solar Energy Systems ISE, based on data from the energy-charts.info platform, which highlights a 10% year-on-year increase for solar PV generation in Germany. The European Union experienced a similar trend in the past decade, with solar PV generation rising by 254% since 2015, as shown in the chart below. Solar PV’s share of electricity generation in H1 2026 reached 18.2% in Germany, a 1.3 percentage point increase from the same period last year. During that period, total installed solar PV rose from 118GW to 124.9GW, with ground-mounted systems contributing the most to the growth of solar PV in H1 2026 with 3.5GW. Rooftop solar followed with 2.1GW of new capacity in H1 2026, and solar installations between 30-100kW accounted for 1.1GW of new installed capacity. Despite the continued growth of solar PV by 7GW in the first six months of the year, a joint analysis by Fraunhofer ISE and German think tank Agora Energiewende the changes currently under discussion as part of the EEG amendment could make “smaller rooftop PV systems, in particular, less economically viable under current conditions.” This could create incentives to design systems on a smaller scale or not to fully utilise available rooftop space. Residential solar systems had already been on the decline in the first quarter of 2026, and the German Solar Association (BSW-Solar) warned at the time that further subsidy cuts for PV systems could push installations even lower.   Increase in negative prices for solar PV and wind Moreover, the high levels of solar PV and wind power generation have led to an increased number of hours during which the day-ahead market price for electricity is negative. Solar curtailment reached nearly 3GWh in H1 2026, with the majority of the curtailed solar PV (58.2%) happening when day-ahead prices were negative. This reinforces the need for intraday energy storage and flexibility, according to Fraunhofer ISE. It added that there remains a significant “storage gap” that needs to be closed in order to allow for the shift in surplus electricity to hours of low generation. That is despite the fact that in H1 2026, there has been more large-scale battery storage systems commissioned that the entirety of 2025. At the end of June 2026, installed energy storage rose from 25.4GWh to 29.3GWh. The expansion of battery storage for intraday storage could reduce negative electricity prices on the power exchange during the day and price spikes in evening hours, explained Fraunhofer ISE. “The heat wave in June, which led to increased electricity demand for cooling while conventional power plants were operating at reduced capacity, resulted in particularly sharp price fluctuations during the evening hours,” wrote the German institution.