Business Innovator - Xpert.Digital - Konrad Wolfenstein

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⭐️ Renewable energies

: Renewable energies: Solar & photovoltaics – consulting and planning – Image: Xpert.Digital

As an industry expert in the fields of mechanical engineering, logistics and photovoltaics, I write here in my Xpert Blog about topics including the solar obligation, solar carports, photovoltaic substructures/mounting systems and solar modules.

The best way to reach me is via email at [email protected] or by phone at +49 89 89 674 804.

Depending on the technology used, electricity from renewable energy sources can be produced significantly more cheaply than electricity generated in conventional power plants. This is shown in a study by the Fraunhofer Institute for Solar Energy Systems ISE. According to the study, electricity from gas turbines and coal-fired power plants is the most expensive to produce.

Photovoltaic systems convert solar radiation into electrical energy using solar cells. In a global comparison, Germany, along with China, the USA, and Japan, was recently among the leading countries in the use of photovoltaics for electricity generation.

In Germany, the installed capacity of photovoltaic systems has increased continuously. In 2020, photovoltaic systems with a capacity of approximately 54 gigawatts were installed in Germany. The electricity generated by these systems amounted to roughly 51 terawatt-hours in the same year. The largest solar power generation capacities are located in southern Germany. Bavaria currently has by far the largest capacity of any German state, followed by Baden-Württemberg.

▶️ Heating subsidies cut: When the government saves – How a medium-sized company ingeniously saves heat pump subsidies
A medium-sized craft business from Hanover is offsetting the reduction in heat pump subsidies out of its own pocket and taking immediate responsibility for its customers. | The German government is lowering the eligible assessment basis from €30,000 to €28,000 and introducing new social tiers that hit higher-income homeowners harder. | | The reform aims to redistribute wealth in favor of low-income households, but at the same time leads to increasing uncertainty and postponed investment decisions. | Nordwærme is granting precisely the percentage discount that compensates for the government cut and is communicating this as a contribution to reliability in the skilled trades. | The campaign is a clever marketing move with manageable costs that fosters customer loyalty, media attention, and trust. | | Technically, the company is relying on a milling process for the quick and cost-effective retrofitting of underfloor heating systems, which makes heat pumps more efficient. Industry data reveals significant uncertainty: order backlogs are shrinking, and growth scenarios range from strong increases to substantial declines. | Individual compensation remains temporary and cannot comprehensively resolve structural funding problems. | Such company-specific solutions partially mask political shortcomings and reduce the pressure for a sustainable reform of the funding architecture. | In the long term, the energy transition in the heating sector remains on a reliable [...]

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▶️ Utility-scale photovoltaics and tensegrity architecture: Up to 70% lower costs and safe support structures for solar modules
Tensegrity-based utility-scale photovoltaics promises up to 70% lower substructure costs through material-efficient tension networks. | Controlled compliance increases storm resistance and reduces the risk of torsion-related damage. | Modularity and low weight facilitate automated assembly and lower labor and logistics costs. | Adaptability to uneven terrain opens up new, previously uneconomical areas for solar projects. | Life cycle costs, insurance premiums, and failure risks are becoming central to economic assessments. | Independent wind tunnel tests and dynamic load analyses are crucial for investor confidence. | Long-term questions regarding cable fatigue, corrosion, and maintenance intervals require pilot projects and field data. | Tensagrid and similar concepts complement, rather than replace, classic torque tube systems in specific applications. | Material efficiency and resilience make such designs future-proof in the age of extreme weather events. | For developers and investors: understand structural design as a strategic risk position and favor empirically validated solutions. [...]

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▶️ 25,000 solar modules for a solar parking lot above the cars in Essen: The mega-project on the P10 trade fair parking lot
Essen is transforming the P10 trade fair parking lot into a large solar carport with 25,000 solar modules. The project will generate up to 11 MWp and around 11 GWh of electricity annually. Investments of €15–20 million will create new revenue streams for the city. Approximately 5,000 tons of CO2 will be saved annually, and climate-friendly energy will be supplied. ROOF+ from Bochum is carrying out the construction work and strengthening regional value creation. The electricity will be marketed directly to municipal customers through Power Purchase Agreements. The dual use of the land conserves natural areas and increases land efficiency. However, construction time, permits, and technical challenges remain risks. Citizen participation and municipal partnerships increase acceptance and planning certainty. P10 can serve as a blueprint for comparable urban solar projects in Germany. [...]

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▶️ Transparent GridParity solar modules: Generate electricity and let light through – The ingenious solar solution for patios and carports
Discover semi-transparent GridParity modules for carports, patios, and conservatories that generate electricity and let in daylight. | | The glass-glass construction with bifacial cells offers extra robustness and suitability for overhead applications in demanding projects. | | Benefit from dual surface use: weather protection and energy generation in a single component. | Despite the higher price, the amortization period is reduced thanks to increased yield, longer lifespan, and integrated functionality. | | Up to 30-year performance guarantees and certified wind and snow load resistance provide planning security. | pvDach focuses on quality instead of a throwaway economy and offers a sustainable alternative to cheap mass-produced goods. | Bifacial technology can boost yield by 10–30%, depending on the substrate. | Different levels of transparency allow for the optimal balance between light comfort and performance. | Ideal for architects, builders, and farmers who want to combine design, function, and energy efficiency. | | Choose according to your application: For maximum surface area output alone, an opaque standard module is often more economical. [...]

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▶️ Swarm storage | Electric car as energy storage: The battle for the electricity market – When stationary metal boxes become gold mines
Electric cars sit unused for an average of 23 hours a day – a gigantic storage medium is waiting in every garage. | With bidirectional charging (vehicle-to-grid), vehicle batteries become decentralized energy storage systems that can buffer surplus solar and wind power. | This principle makes it possible to charge during the day and supply the grid or households again in the evening, thus increasing grid stability. | Studies see potential savings of up to €22 billion per year in Europe and significant reductions in the need for grid expansion. | | The EU is creating the technical prerequisites with ISO 15118 and new regulations, but standards alone do not guarantee market penetration. | Manufacturers such as BMW, Volkswagen, and Hyundai are launching initial commercial V2G offerings, but often rely on closed ecosystems. | This fragmentation and lack of interoperability could slow down widespread adoption and restrict competition and customer benefits. | For private households, this results in concrete savings (around €700 per year) and additional feed-in tariffs. A European data space and uniform standards are crucial for electric cars to function as flexible swarm storage systems. | The future race between regulation and manufacturer interests will determine whether electric cars become a key resource for the energy transition or remain a fragmented promise. [...]

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▶️ “Electrification Action Plan”: EU overrides German heating law – Why oil and gas could soon become unaffordable
The EU's "Electrification Action Plan" envisions the comprehensive electrification of transport and buildings by 2040. | This could undermine Germany's heating law, as electricity is intended to economically displace fossil fuels. | Brussels is relying on price controls rather than bans to make gas and oil less attractive through electrification. | | Heat pumps and e-mobility are at the heart of the strategy; e-fuels and green gases remain niche options. | | Social leasing and funds are intended to ensure a socially just transition. | Expansion targets for renewable electricity, nuclear energy, and storage are prerequisites for the planned surge in demand. | | For Germany, this creates a conflict of objectives between national technological openness and European commitments. | Industry sees opportunities through planning certainty, but also risks due to fluctuating subsidy landscapes. | If electricity becomes cheaper than gas, market forces could render the German Building Energy Act (GEG) de facto obsolete. | Ultimately, the plan aims for a coherent, security-oriented, and more energy-independent European strategy. [...]

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▶️ EVN and the myth of the "luxury problem"? The real core problem: Too much electricity or too little grid?
EVN is investing €5.5 billion by 2030 in grids, storage, and digitalization to solve the perceived "luxury problem." | Europe doesn't have a generation problem, but an infrastructure problem – a lack of grids and storage is slowing down the energy transition. | | With massive grid expansion in Lower Austria, EVN is creating more transmission capacity for wind and solar power. | Large battery storage facilities at former power plant sites transform surplus energy into market opportunities and grid stability. | The combination of generation, grid, and storage is the scalable model for regional energy sovereignty. | EVN leverages its strategic agility as a medium-sized utility without fossil fuel liabilities. | Financial discipline and high taxonomy compliance ensure favorable capital conditions and sustainable growth. | | Investments in district heating and geothermal energy are driving the underestimated heat transition. | Experience in Bulgaria and North Macedonia strengthens the international scalability of the model. EVN demonstrates that an integrated investment program resolves system tensions and makes the energy transition feasible. [...]

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▶️ How the global crisis unleashed the German solar boom: Electricity price miracle thanks to solar
| The German solar boom of 2026 unleashes new record installations and drives the energy transition forward. | Battery storage is growing rapidly and transforming from a supplementary technology into a strategic asset. | Commercial photovoltaics is becoming increasingly profitable due to high self-consumption and rising fossil fuel prices. | Renewable energy decouples electricity prices from gas and stabilizes the spot market. | The 2027 amendment to the Renewable Energy Sources Act (EEG) hits private households harder but strengthens companies with professional energy management. | Geopolitical crises such as the Iran nuclear deal act as a catalyst for energy self-sufficiency and investment. | Tax depreciation rules and subsidies increase the short-term profitability of PV projects. | Security of supply is becoming a competitive factor for industry and SMEs. | | Despite the boom, gaps in expansion targets, grid bottlenecks, and a shortage of skilled workers remain key challenges. | Companies that invest in solar and storage now secure long-term cost stability and resilience. [...]

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▶️ Energy policy put to the test: Four problem areas, one system failure – Between centrally planned control and regulatory overload
Germany's Energy Policy 2026 Put to the Test: Failures in Four Key Areas Threaten the Energy Transition. | | Excessive government control and regulatory overreach create planning uncertainty for investors and households. | | The new Electricity Supply Act (StromVKG) creates security of supply, but de facto favors gas-fired power plants and poses risks under European law. | | The Building Modernization Act contains open regulatory questions and could miss climate targets. | Subsidies for heat pumps are redistributed socially, but signal a stop-and-go approach and hinder economies of scale. | Energy sharing remains largely ineffective due to a lack of smart meter infrastructure and regulatory practice. | Institutional instability increases risk premiums and inhibits private investment in decarbonization. | | Proposed solutions: technology-neutral instruments, reliable CO2 signals, and massive grid investments. | Without clear rules, a digitalization platform, and a smart meter rollout, Germany risks losing its attractiveness as a business location. Xpert.digital analyzes the political mistakes and shows pragmatic paths to restoring trust and investment security. [...]

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▶️ The electricity grid and heat pumps as scapegoats: Why Germany has failed for years in grid expansion
The electricity grid is not the main culprit; rather, it's decades of underinvestment and slow approval processes. | | Heat pumps are often made the political scapegoat, even though they have long been the dominant technology in new construction. | | Grid bottlenecks are the result of delayed infrastructure development and not primarily private consumers. | | Section 14a of the German Energy Industry Act (EnWG) is a temporary buffer, not a permanent solution, and creates incentives through grid fee reductions. | The costs of fossil fuel heating will rise sharply in the long term due to CO2 pricing and the EU Emissions Trading System (ETS 2), making heat pumps more economically attractive. | Redispatch and balancing costs demonstrate the shift of the problem to the transmission grids and could be avoided with timely expansion. | Virtual power plants and sector coupling offer technical solutions to dampen peak loads and reduce grid capacity requirements. | The costs associated with climate change make hesitation in switching to electrically powered heating a risky financial decision. | | Projects like JenErgieReal demonstrate how digital control and local storage can increase grid stability. Accelerated planning, clear funding conditions, and political reliability are crucial to ensure that grid expansion and heat pump installations go hand in hand. [...]

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▶️ China's silent access to our power grid: Why the EU is now pulling the plug
China's remote access to inverters threatens grid resilience in Europe and necessitates political action. | Over 200 GW of PV capacity is already connected to Chinese inverters, posing significant security risks. | The EU is halting subsidies for high-risk devices and advancing technological sovereignty. | Battery storage could save billions and significantly reduce negative electricity prices. | European manufacturers have the capacity; the market downturn is primarily due to Chinese pricing strategies. | Replacing Chinese inverters would only moderately increase project costs (approx. 2–4%). | Research into long-term storage technologies such as iron powder opens up new seasonal storage options. | Existing power plant infrastructure could be converted for iron storage, securing regional value creation. | Clear legislation, faster grid connections, and targeted support policies are crucial. | Xpert.Digital analyzes the interfaces of geopolitics, technology, and economics for a secure, independent energy transition. [...]

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▶️ News on the GridParty insolvency: PV terraces & solar carports: How a savior from Bavaria is reviving the lucrative niche market
The GridParity insolvency reveals management errors and risky expansion rather than solely political blame. | Internal conflicts, resistance to advice, and a flawed strategy drove the once-pioneering solar company to ruin. | The technological legacy—frameless double-glass modules for overhead mounting—remains valuable and certified. | pvDach eK from Rottenburg has acquired the naming rights and is focusing on streamlined structures. | With a focus on B2B customers, contract manufacturing, and efficient project execution, pvDach is strategically differentiating itself. | PV terraces and solar carports offer stable demand through self-consumption, architectural benefits, and compliance with commercial regulations. | The niche market benefits from normalizing module prices and reduced dependence on feed-in tariffs. | Investors are learning: Technology isn't enough—leadership, openness to advice, and operational reliability are what count. | pvDach is taking advantage of the market consolidation, building a portfolio of references, and targeting institutional clients. Perspective: With focused niche expertise and a B2B strategy, pvDach is positioned for a profitable solar future. [...]

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▶️ STABL Energy: Second life for electric car batteries – Critical assessment, strengths, limitations and unresolved questions
STABL Energy transforms end-of-life electric vehicle batteries into safe, modular large-scale storage systems, thus extending their lifecycles. | | A novel modular multilevel inverter technology enables the dynamic balancing of heterogeneous battery modules. | The Energy-as-a-Service subscription lowers entry barriers for commercial customers and delivers immediate electricity cost savings. | Second-life storage systems reduce CO₂ emissions and conserve scarce raw materials such as lithium and cobalt. | Strategic partnerships and awards demonstrate the Munich-based startup's market and technological maturity. | Despite strong growth prospects, scaling remains capital-intensive and dependent on battery availability. | Patents and collaborations with semiconductor manufacturers strengthen the competitive position, but major players are potential challengers. | | Regulatory requirements such as the EU Battery Directive create opportunities but also introduce additional compliance hurdles. Large-scale technical validation and standardized norms remain open questions for long-term market penetration. | If scaling is successful, STABL has the potential to play a central role in the circular economy and energy transition. [...]

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▶️ 1 cent per kWh: How a new salt-based battery from China solves our energy problems – The end of the excuse of low wind and solar power generation
CATL's Tener Sodium could revolutionize energy storage and refute the "dark doldrums" argument. | Sodium-ion technology uses table salt instead of scarce lithium reserves and reduces geopolitical risks. | With economies of scale and 60 GWh contracts, storage costs of around €0.01/kWh are within reach. | The raw material base is widely available and significantly cheaper than lithium, cobalt, or nickel. | Economically, the system challenges gas-fired power plants and changes the cost calculation for security of supply. | CATL is expanding massive production capacities and driving the industrialization of the technology. | Europe's prices for battery systems could fall significantly due to Chinese economies of scale if Europe follows suit. | | Politically, this means: regulation, industrial policy, and fair market conditions must be rethought. | The technical maturity, cold-weather capability, and long cycle stability make sodium storage attractive for large-scale projects. For xpert.digital: A concise update on the storage revolution and its consequences for the energy transition, politics, and industry. [...]

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▶️ Surprise in Munich: Why 14 Bulgarian companies are stealing the show at the largest energy trade fair
| Intersolar Europe 2026 in Munich marks a historic turning point for the solar industry. | Large-scale storage and hybrid systems are increasingly replacing the residential segment as growth drivers. | Renewable energies are displacing coal and gas worldwide, fundamentally changing the electricity mix. | | China's export policies and production overcapacities are shaping prices and supply chains globally. | | US tariffs and trade tensions are causing additional market disruptions. | | Europe sees this restructuring as a strategic opportunity for domestic manufacturers. | Investments in solar and storage are reaching record levels, while grid expansion is becoming a key challenge. | New funding and tendering regulations, such as the NZIA, strengthen resilience and quality criteria. | The trade fair acts as a seismograph for system integration, financing, and market strategies. | Those who understand and shape this structural change will be among the winners of the next decade. [...]

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▶️ Intersolar Europe 2026: The solar industry is booming – but the golden years of easy growth are over
| Intersolar Europe 2026 in Munich marks a historic turning point for the solar industry. | Large-scale storage and hybrid systems are increasingly replacing the residential segment as growth drivers. | Renewable energies are displacing coal and gas worldwide, fundamentally changing the electricity mix. | | China's export policies and production overcapacities are shaping prices and supply chains globally. | | US tariffs and trade tensions are causing additional market disruptions. | | Europe sees this restructuring as a strategic opportunity for domestic manufacturers. | Investments in solar and storage are reaching record levels, while grid expansion is becoming a key challenge. | New funding and tendering regulations, such as the NZIA, strengthen resilience and quality criteria. | The trade fair acts as a seismograph for system integration, financing, and market strategies. | Those who understand and shape this structural change will be among the winners of the next decade. [...]

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▶️ Fraunhofer innovation: How companies can end the expensive energy trap with network charges
The ESiP Analyzer optimizes the self-consumption of renewable energy in factories, making energy storage planning data-driven and practical. | With simulations and tailored operating strategies, the tool reduces peak loads and increases the efficiency of production processes. | In many cases, almost half of the self-generated electricity can be utilized, lowering operating costs and improving profitability. | By smoothing consumption, the Analyzer contributes to grid stability and relieves the burden on local distribution networks. | The tool considers various storage technologies and specific production parameters for customized solutions. | Missing planning data is intelligently scaled and supplemented, enabling meaningful analysis even of incomplete scenarios. | Companies can use the Analyzer flexibly – from one-off concepts and consulting projects to licensing models for continuous optimization. | Furthermore, combining it with energy market strategies, emergency power functionality, and machine-level feed-in unlocks new potential benefits. | Practical tests with energy suppliers and industry have already confirmed the tool's reliability and added value. xpert.digital presents this innovation as the key to resource-efficient, stable, and future-proof energy planning in industry. [...]

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▶️ BgGPT and BRAIN++ | Bulgaria in the AI Age: Between Digital Transformation and Structural Contradictions – Small Country, Great Potential
Bulgaria surprises: Little everyday digitization, but strong cutting-edge AI research. | Sofia is developing into a European AI hotspot with INSAIT and BgGPT. | BRAIN++ is bringing an AI factory and €90 million in EU funding to Bulgaria. | The EU AI Act creates market opportunities for compliance and governance solutions. | Favorable development costs, EU legal certainty, and low taxes make Bulgaria attractive for companies. | Despite brain drain, there are over 80,000 IT professionals and international partners. | Private, data-sovereign AI and on-premise solutions are in demand in the market. | Government funding and subsidies target SME digitization and further training. | Risks remain: political instability, lack of an implementation plan, and the emigration of skilled workers. | Conclusion: Bulgaria has the potential to become a European bridgehead for AI—if politics, business, and research act quickly and in a coordinated manner. [...]

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▶️ Monopoly profits in the electricity grid: How grid operators rake in the money while the energy transition waits
Germany's electricity grid as a source of profit: How grid operators rake in high profits while the energy transition remains stalled. | Monopoly structures and regulatory loopholes enable returns on equity far exceeding the intended values. | Consumers and industry foot the bill through rising grid fees and hidden costs. | Balance sheet analyses reveal discrepancies between regulatory interest rates and commercial returns. | 40,000 projects are waiting to be connected—a massive investment backlog jeopardizes climate targets and economic growth. | Investment backlogs and internal delays at grid operators effectively slow down expansion. | Redispatch and congestion costs burden the economy with billions annually. | Political and regulatory reforms such as AgNes and NEST are being discussed, but so far have not provided a sufficient solution. | Demands: more transparency, performance-based returns, and accelerated permitting. | xpert.digital analyzes the systemic flaws and shows reform paths for a future-proof electricity grid. [...]

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▶️ Bulgaria's energy transition: How did the poorest EU country become Europe's battery storage champion?
Bulgaria transformed itself in record time from a coal-based nation to a European leader in battery storage. | With over 1,100% growth and more than 16% storage capacity in its electricity system, the country is setting new standards. | RESTORE funding and bold regulatory reforms ignited an investment boom and attracted billions in private capital. | Europe's first BESS gigafactory and large-scale projects like Lovech demonstrate Bulgaria's industrial ambitions. | High arbitrage profits on the spot market made the market extremely attractive for storage operators. | However, supply chain, grid, and deadline pressures, as well as political risks, are putting implementation to the test. | | With increasing capacity, narrower price spreads are looming, which is why operators must rely on grid services and cross-border strategies. | The batteries enable the integration of solar energy and act as a national balancing mechanism and export instrument. | Whether Bulgaria will benefit economically in the long term depends on market adjustments, infrastructure, and governance. | This development makes Bulgaria the most vibrant laboratory for energy storage strategies in Europe. [...]

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⭐️ Renewable energies

▶️ Heating subsidies cut: When the government saves – How a medium-sized company ingeniously saves heat pump subsidies

▶️ Utility-scale photovoltaics and tensegrity architecture: Up to 70% lower costs and safe support structures for solar modules

▶️ 25,000 solar modules for a solar parking lot above the cars in Essen: The mega-project on the P10 trade fair parking lot

▶️ Transparent GridParity solar modules: Generate electricity and let light through – The ingenious solar solution for patios and carports

▶️ Swarm storage | Electric car as energy storage: The battle for the electricity market – When stationary metal boxes become gold mines

▶️ “Electrification Action Plan”: EU overrides German heating law – Why oil and gas could soon become unaffordable

▶️ EVN and the myth of the "luxury problem"? The real core problem: Too much electricity or too little grid?

▶️ How the global crisis unleashed the German solar boom: Electricity price miracle thanks to solar

▶️ The electricity grid and heat pumps as scapegoats: Why Germany has failed for years in grid expansion

▶️ China's silent access to our power grid: Why the EU is now pulling the plug

▶️ News on the GridParty insolvency: PV terraces & solar carports: How a savior from Bavaria is reviving the lucrative niche market

▶️ STABL Energy: Second life for electric car batteries – Critical assessment, strengths, limitations and unresolved questions

▶️ 1 cent per kWh: How a new salt-based battery from China solves our energy problems – The end of the excuse of low wind and solar power generation

▶️ Surprise in Munich: Why 14 Bulgarian companies are stealing the show at the largest energy trade fair

▶️ Intersolar Europe 2026: The solar industry is booming – but the golden years of easy growth are over

▶️ Fraunhofer innovation: How companies can end the expensive energy trap with network charges

▶️ Monopoly profits in the electricity grid: How grid operators rake in the money while the energy transition waits

▶️ Bulgaria's energy transition: How did the poorest EU country become Europe's battery storage champion?

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