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.

▶️ Salt instead of lithium: The new battery revolution that Europe is missing? Europe's billion-dollar lithium bet could be wrong – again
Europe's Battery Alert: Sodium ions from table salt could challenge the lithium era. | | China is scaling up rapidly and pushing forward with the mass production of salt batteries. | | Sodium offers lower costs, fewer geopolitical risks, and high cold resistance. | The technology is already competitive for city cars, commercial vehicles, and stationary storage. | | Premium models with high energy density will continue to rely on lithium for the time being. | Research and initial production runs show that the drop-in strategy facilitates the conversion of existing factories. | Rising lithium prices and volatile markets are accelerating sodium adoption. | | Europe risks losing market share if industrial policy and manufacturing capacity are lacking. | | Sustainability advantages such as eliminating cobalt and better CO₂ balances strengthen the argument for sodium. | The question is not whether, but how quickly sodium markets will grow and which strategy Europe chooses now. [...]

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▶️ The new energy agenda under Katherina Reiche under scrutiny: The blind spot of current energy policy for small and medium-sized enterprises
The new energy agenda under Katherina Reiche analyzes who truly benefits and who pays. | | The industrial electricity price could favor large corporations and exclude medium-sized suppliers. | The three-year period for government-capped prices provides short-term relief but no long-term planning security. | Bureaucratic relief and tax incentives help SMEs, but structural disadvantages remain. | The emphasis on gas-fired power plants instead of decentralized storage increases investment uncertainty for future-proof technologies. | SMEs need tailored funding instruments and easily accessible energy management solutions. | Without fair access rules, there is a risk of deepening competitive disadvantages compared to global competitors. | Transparency, SME testing, and lobby controls are necessary to correct systemic imbalances. | | A truly SME-oriented energy policy requires long-term framework conditions and technology-neutral strategies. | Only in this way can Germany's economic foundation be secured and competitiveness sustainably strengthened. [...]

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▶️ Why Germany's electricity grid is becoming the most expensive renovation project of the energy transition
Germany is experiencing a battery boom, but many large-scale storage facilities are fully built and idle without a grid connection. | | A regulatory vacuum regarding grid access is repeating historical mistakes made during the liberalization of the electricity market. | | The lack of uniform rules and deadlines is giving regional grid operators too much discretion. | The delays are driving congestion management costs into the billions and burdening consumers. | | The technical potential of storage for grid stability and flexibility remains untapped. | Investment uncertainty and contradictory regulations are hindering the urgently needed expansion. | Maturity assessments by transmission system operators are a step in the right direction, but they leave the distribution grid unaddressed. | Clear, nationwide regulations would create planning certainty and market growth. | Only with uniform connection processes, incentive systems, and sanctioning options can the energy transition be implemented cost-effectively. | | Policymakers must act now, otherwise an expensive learning process from the past will be repeated. [...]

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▶️ 84 percent cheaper: A technology in free fall upwards – The truth about battery storage
Germany's battery price crash reveals: Storage is up to 84% cheaper and is revolutionizing the energy market. | Expansion is booming worldwide — China, Australia, and the USA are investing heavily in large-scale storage. | | German policymakers, on the other hand, are promoting expensive gas-fired power plants, thus ignoring economic realities. | | From an economic perspective, renewables plus battery storage are often cheaper than new gas-fired power plants. | Regulatory decisions such as the Electricity Supply Act (StromVKG) currently favor gas-fired power plants over battery storage. | Proper market designs could make storage competitive and guarantee security of supply more efficiently. | Every gigawatt of storage reduces dependence on fossil fuel imports and saves costs. | International examples show: Tailored tenders promote competition and technological diversity. | The window of opportunity for correction is closing — before 15-year contracts lock in structures. | | The decision now will determine whether Germany misses out on or shapes a global storage revolution. [...]

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▶️ Gas-fired power plants instead of battery storage: 800 million euros wasted? A law that will decide the energy future
Germany faces a watershed moment in energy policy because the Electricity Supply Act (StromVKG) could effectively exclude battery storage systems through a strict 10-hour criterion. | | The law threatens to cement expensive and risky import dependency by providing preferential compensation for fossil gas power plants. | Battery storage systems have proven themselves as Europe's leading technology and could save around €800 million in system costs annually. | | The prescribed recharging requirement of one hour after a ten-hour discharge is technically unrealistic for common lithium-ion systems. | | The parliamentary process still offers the opportunity to make tendering rules more technology-neutral and flexible. | | Without corrections, the market risks being distorted in favor of gas-based long-term contracts with a 15-year duration. | International examples show that differentiated tenders for various storage types enable security of supply without new gas-fired power plants. | Decentralized home storage and large-scale storage reduce redispatch and strengthen local grid stability. Investment and industrial policy are at stake: Germany could lose its leading role in the battery storage market. | Now it's a matter of setting the political course so that climate protection, security of supply, and economic viability can be reconciled. [...]

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▶️ The technical lobby trap: How a ministry scandal surrounding the 10-hour rule is virtually shutting down battery storage
A ministry scandal reveals how the controversial 10-hour rule in the planned Electricity Supply Act (StromVKG) effectively excludes battery storage. | | The technical requirement not only mandates ten hours of feed-in but also a one-hour recharging period, rendering battery storage economically unviable. | | The fact that the Ministry of Economic Affairs explicitly requested wording from EnBW that would have precisely this exclusionary effect is particularly concerning. | | Regulatory capture is a likely consequence: state regulations were co-designed by profit-oriented energy companies. | Billions in subsidies via a consumer levy are threatened, which could cement a technological decision in the long term. | The rules create a technological lock-in in favor of new gas-fired power plants and disadvantage competitive storage solutions. | | The Federal Cartel Office, operators, and NGOs are examining legal options and criticizing the lack of safeguards for competition and transparency. | | The EU's requirements for technological neutrality could be violated by the de facto exclusion of battery storage. Civil society and transparency organizations are demanding clarification, sanctions, and stricter lobbying regulations. | Open questions remain: Will courts, the EU, and the German Bundestag administration amend the rules and hold those responsible accountable? [...]

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▶️ No EU import ban but funding stoppage for Chinese inverters: When security policy slows down the energy transition
The EU is halting subsidies for inverters from high-risk countries, prioritizing security over cheap supply chains. | The move primarily affects Chinese manufacturers and is triggering geopolitical tensions with Beijing. | Experts warn that networked inverters could pose a threat to the power grid as a gateway for cyberattacks. | Without affordable Chinese technology, the energy transition in Europe risks slowing down. | European manufacturers are given a chance, but capacities and prices will remain limited for the time being. | In the short term, supply bottlenecks and higher project costs are possible, delaying solar expansion. | The measure affects not only PV, but also storage, wind power, and charging infrastructure. | Brussels is attempting derisking instead of complete decoupling, but remains legally and diplomatically vulnerable. | In the long term, Europe needs investment in its own production, clear certifications, and a plan for the existing equipment inventory. | The subsidy halt is a first step toward technological sovereignty—but not a complete security concept. [...]

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▶️ Energy policy failure: Electricity is given away for free, but you pay record prices: How to escape the energy trap
Germany produces too much green electricity, yet households are paying record prices. | Policy failures are driving up grid costs, curtailments, and subsidies. | Billions are flowing as compensation for unused electricity – consumers are footing the bill. | Negative exchange prices reveal the paradox: an abundance of electricity, but high retail prices. | Balcony power plants and LFP storage systems allow tenants and homeowners to immediately reduce costs. | The combination of dynamic tariffs and home storage enables smart price arbitrage. | Plug-and-play mini-PV systems make decentralized self-sufficiency realistic even for city dwellers. | Investing now reduces grid dependency and protects against future levies. | Technically sophisticated solutions and legal clarity since 2024 are accelerating adoption. | xpert.digital shows you how to use energy policy mistakes to your financial advantage. [...]

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▶️ State-sponsored oligopoly? Dangerous concentration of power: The Federal Cartel Office's alarming findings on the power plant law
The Electricity Supply Act (StromVKG) proposed by Federal Minister of Economics Reiche threatens to create a state-subsidized oligopoly favoring large energy companies. | The planned payments secure long-term revenues for RWE, EnBW & Co. at the expense of all electricity consumers. | | The Federal Cartel Office strongly warns against the consolidation of existing market power and the lack of competition protection. | Technical hurdles such as the 10-hour rule favor gas-fired power plants and displace modern battery storage systems. | Consumers could face permanently higher costs from 2031 onwards due to a new capacity levy. | The legislation favors established companies with grid connections and disadvantages new market entrants and innovations. | Research suggests that corporate lobbyists actively participated in the formulation of key regulations. | At the same time, subsidies for renewable energies are being reduced, even though battery storage is cheaper and more climate-friendly. | The result would be a technological regression with negative consequences for climate targets, competition, and consumer prices. | xpert.digital calls for transparency, fair market access, and a technology-neutral design instead of state-guaranteed corporate pensions. [...]

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▶️ 589% battery boom after the dark shock: What we now need to learn from Spain
Spain's 16-hour blackout in 2025 demonstrates the urgent need to expand grid infrastructure and storage. | A combination of technical weaknesses, not renewable energies alone, triggered the system collapse. | ENTSO-E reports recommend active voltage regulation through photovoltaics and more modern inverters. | The isolated location of the Iberian Peninsula makes interconnectors and cross-border lines indispensable. | Within a year, Spain's battery storage capacity grew by 589 percent—a dramatic boom. | Decentralized home storage systems increase the resilience of households and can operate as virtual power plants to support the grid. | | Spain invested over €818 million in storage projects, but expansion lags behind other countries. | In the short term, stabilizing the grid led to increased use of gas-fired power plants and higher CO₂ emissions—a political dilemma. | The lesson for Europe: Energy policy needs a more systems-oriented approach—generation, storage, and stabilization must be planned with equal priority. xpert.digital analyzes the consequences and shows how investments in storage, control technology, and interconnectors can secure the energy transition. [...]

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▶️ Pathways to greener steel: How COGNE and the steel industry are making their production more sustainable
COGNE demonstrates, with 100% renewable electricity and its own electrolyzer, how green steel can be implemented practically and economically. | | The electric arc furnace and efficient recycling reduce emissions and save billions in raw material costs. | Green hydrogen as a core technology can drastically reduce CO2 emissions from primary steel production. | Investments in exhaust gas cleaning, emissions monitoring, and modern facilities ensure operating permits and efficiency. | CBAM and CO2 pricing make low-emission production a clear competitive and cost factor. | Soil and groundwater protection, as well as closed water cycles, are crucial for long-term site compatibility. | External certifications such as Responsible Steel and transparent sustainability reports create credibility against greenwashing. | The transformation requires significant investment but offers strategic opportunities for value creation and market position. | | A mix of short-, medium-, and long-term measures is needed to reconcile technology, economics, and regulation. | The steel revolution is not about sacrifice, but a strategic opportunity for sustainable competitiveness. [...]

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▶️ Solar highway? Forgotten photovoltaic areas: How 13,000 kilometers of highway are supposed to save the German power grid
Solar highways? Germany's highways offer untapped photovoltaic potential of up to 300 GW and could significantly advance the energy transition. | | Legal privileges and simplified permitting processes since 2023 have significantly opened the market for solar power along highways. | Investors and project developers recognize the opportunity, but the boom is accompanied by intense competition and insolvency pressure. | Construction and grid connection costs, as well as specific design requirements, can considerably impact profitability. | | Negative electricity prices and shortened feed-in tariff models increase the risk of returns and jeopardize the financing of many projects. | Choosing the right partners, credit checks, and bankable completion guarantees are crucial for project security. | Long-term power purchase agreements (PPAs) combined with storage offer hedging potential but are often insufficient on their own. | | A nationwide cadastre and GIS analyses are essential prerequisites for effective spatial and grid planning. | Strict contractual standards apply to municipalities and landowners: minimum leases, rights of withdrawal, and decommissioning obligations are mandatory. Conclusion: Enormous technical potential meets high project complexity — returns are only achieved through stringent risk and partner management. [...]

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▶️ Take action yourself: Why energy autonomy is the best economic self-defense for households and small and medium-sized enterprises
Energy autonomy as economic self-defense for households and SMEs: Why self-sufficiency is strategically important now. | Unpredictable electricity costs threaten margins and planning certainty, which is why precautionary measures are economically sound. | From passive payer to prosumer: Photovoltaics, storage, and load management create financial control. | For SMEs, energy management means competitive advantages and reduced price risks. | Planning security often counts more than the highest calculated return in volatile markets. | Storage increases flexibility and reduces vulnerability despite longer amortization periods. | Citizen energy and cooperative models distribute added value regionally and create access without homeownership. | | Concrete steps: Consumption transparency, load profile analysis, and systemic combinations of PV, storage, and efficiency. | Hybrid solutions such as PPAs and structured procurement complement self-sufficiency for robust cost architectures. | Conclusion: Self-reliant risk mitigation through decentralized energy is not an ideology, but an economic necessity. [...]

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▶️ Germany's new gas debate: What Jan Fleischhauer (Focus / Der schwarze Kanal) overlooks
Germany's new gas debate analyzes political continuity and examines economic fallacies surrounding gas-fired power plants. | | The text emphasizes that moral inconsistencies are politically relevant, but not an economic justification for large-scale gas investments. | | Key criticisms include the risks of lock-in, dependence on fuel prices, and distorted tendering rules favoring fossil fuel options. | | Time economics plays a significant role: New gas-fired power plants would only become effective much later and could be economically obsolete by then. | Long-term battery storage and other flexibility options are highlighted as cost-effective alternatives to gas. | The energy transition in new buildings is progressing faster than often assumed, while existing buildings remain trapped in the gas cycle. | Economically relevant factors include life-cycle costs, subsidy requirements, and the distribution of investment versus operating costs. | Security of supply requires a technology-neutral mix of storage, grid expansion, demand management, and European integration. | | Precise tendering processes, clear decarbonization pathways, and technology-neutral competitive conditions are crucial. Conclusion: The debate calls for data-driven assessments rather than moralistic symbolic politics to ensure energy security efficiently and in a climate-friendly way. [...]

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▶️ The fatal gas trap: Why millions of German households are threatened with the next heating shock
The fatal gas trap explains why millions of households in Germany are facing a massive heating shock. | | Two gas crises in four years reveal the vulnerable dependence on fossil fuels. | Millions of gas heating systems make the boiler room a matter of national security. | The rising CO₂ price and uncertain supply chains are driving up costs and risks for consumers. | | Heat pumps, district heating, and geothermal energy are market-ready alternatives that enable the phase-out. | Nevertheless, slow renovation rates, a shortage of skilled workers, and unclear policies are hindering the conversion. | | New construction trends show progress, but the large existing building stock remains the core problem. | The investment required is enormous, which is why stable subsidies and clear regulations are needed. | | Political hesitancy and changes in legislation threaten to slow down the energy transition. | A decisive change of course can ensure security of supply, climate protection, and cost stability simultaneously. [...]

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▶️ Agri-PV or “Cow-PV”? Nestlé Biessenhofen: When cows generate solar power – Economic analysis of an integrated energy transition model
Nestlé Biessenhofen combines agri-PV and pasture farming, demonstrating how solar power and animal welfare can go hand in hand. The "cow-PV" system provides shade for cows and covers a quarter of the plant's electricity needs. Direct self-sufficiency saves the plant grid fees and reduces rising electricity costs. Industrial heat pumps and thermal storage create a highly efficient, integrated energy system. The investment of around three million euros acts as a lever for long-term cost reduction and competitiveness. The farmer and the region benefit from lease income, new barn technology, and local value creation. Agri-PV is positioned as a growth market with great potential for agriculture. The project reduces CO2 emissions and is part of Nestlé's climate strategy for decarbonization. Local partnerships and acceptance demonstrate how the energy transition can be socially responsible. Biessenhofen serves as a blueprint for the industrial energy transition and scalable climate protection solutions. [...]

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▶️ Decentralized energy transition and SMEs: How this decentralized energy strategy would have saved SMEs
| Decentralized energy transition instead of expensive gas-fired power plants: How SMEs could gain independence through PV, storage, and biogas. | Large industries benefit from exemptions, while medium-sized businesses and tradespeople have to bear rising levies. | Current policies create path dependencies and burden small businesses with power plant costs financed through levies. | Decentralized solutions offer planning security, reduce stock market price risks, and strengthen the competitiveness of bakeries, craft businesses, and small hotels. | Battery storage and virtual power plants can smooth peak loads, increase self-consumption, and open up new revenue streams through flexibility markets. | Flexible biogas CHP plants and modernized pumped storage facilities would be cost-effective bridging solutions instead of new fossil fuel power plants. | Studies show significant savings potential and lower grid expansion costs with decentralized architecture. | Long-term strategies with hydrogen and long-term storage solve seasonal periods of low renewable energy production without permanent import dependency. | A policy that promotes prosumers, citizen energy cooperatives, and neighborhood solutions would strengthen regional value creation. Conclusion: The technology is available, the economic viability is proven — what's lacking is the political will for a fair energy transition that benefits small and medium-sized enterprises. [...]

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▶️ The global energy lie: Why the alleged failure of the energy transition is just a fairy tale
The energy transition has by no means failed, but is experiencing a global boom that is structurally displacing fossil fuels. | Renewables covered around 92.5% of new installations in 2024 and drove global capacity to over 4,400 GW. | Photovoltaics is the growth engine: 451.9 GW of new capacity in 2024 and drastically falling levelized cost of electricity make solar unbeatable in terms of cost. | Fossil fuels remain dominant in primary energy consumption, but are systematically losing market share in terms of growth. | | China dominates production and expansion, installing more solar capacity than the rest of the world combined and controlling key value chains. | | This Chinese dominance results in inexpensive modules worldwide, but poses challenges to industrial autonomy in Europe and North America. | The nuclear debate often serves as a distraction and delaying tactic for fossil fuel lobbyists, while real construction times and costs make reactors unattractive. | | Storage, decentralization, and AI solve intermittent problems and make the system more resilient and efficient. The Global South benefits particularly from affordable solar energy and can become less dependent on expensive fuel imports. | Conclusion: The energy transition is in full swing—the question is not whether, but how quickly and who will reap the economic and geopolitical rewards. [...]

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▶️ The opportunistic expert Daniel Stelter – Germany's energy future between data reality and consultant narratives
Daniel Stelter's book "Absturz" (Crash) paints a dramatic picture of the German economy that often doesn't stand up to close scrutiny. | | His call for a return to nuclear power overlooks costs, construction times, and the loss of infrastructure and expertise. | The economic figures reveal real risks – shrinking GDP, job losses, and rising bankruptcies are serious concerns. | The core problem lies in Germany's energy price structure, which keeps industrial prices significantly above the European average. | Nuclear power is being touted as a quick fix, but due to cost explosions and delays in Europe, it is not a short-term answer. | | Renewable energies are currently the cheapest option, but they require storage, grid expansion, and smart system integration. | The costs of the energy transition are high, but investments in efficiency and storage offer effective short-term leverage. | The consulting industry profits from this polarization; visibility becomes a business model and can distort debates. | | Germany doesn't need simplistic solutions, but rather a combined strategy encompassing efficiency, grid expansion, storage solutions, and European integration. xpert.digital calls for data-driven, realistic policies instead of apocalyptic narratives and consultant marketing. [...]

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▶️ The major subsidy contradiction after harsh criticism of the EEG: CDU minister now plans huge cost levy for gas-fired power plants
The government is planning a capacity levy to promote gas-fired power plants, which could significantly burden consumers and industry. | | Critics speak of political contradiction, as the CDU previously sharply criticized the EEG levy. | Forecasts predict total costs of €340–435 billion over decades. | The goal is security of supply during periods of high renewable energy shares and periods of low wind and solar power generation. | | Financing is to be provided through a new electricity levy, potentially starting as early as 2031. | | Opponents warn of technological preferential treatment for gas and distortion of competition with storage facilities. | Proponents emphasize the need for dispatchable capacity for a stable energy transition. | Studies show that battery storage and flexibility solutions could sometimes be cheaper than new gas-fired power plants. | The debate concerns tariff transparency, social distribution effects, and fiscal credibility. | Conclusion: Security of supply costs money—the central question remains: who must bear this burden? [...]

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⭐️ Renewable energies

▶️ Salt instead of lithium: The new battery revolution that Europe is missing? Europe's billion-dollar lithium bet could be wrong – again

▶️ The new energy agenda under Katherina Reiche under scrutiny: The blind spot of current energy policy for small and medium-sized enterprises

▶️ Why Germany's electricity grid is becoming the most expensive renovation project of the energy transition

▶️ 84 percent cheaper: A technology in free fall upwards – The truth about battery storage

▶️ Gas-fired power plants instead of battery storage: 800 million euros wasted? A law that will decide the energy future

▶️ The technical lobby trap: How a ministry scandal surrounding the 10-hour rule is virtually shutting down battery storage

▶️ No EU import ban but funding stoppage for Chinese inverters: When security policy slows down the energy transition

▶️ Energy policy failure: Electricity is given away for free, but you pay record prices: How to escape the energy trap

▶️ State-sponsored oligopoly? Dangerous concentration of power: The Federal Cartel Office's alarming findings on the power plant law

▶️ 589% battery boom after the dark shock: What we now need to learn from Spain

▶️ Pathways to greener steel: How COGNE and the steel industry are making their production more sustainable

▶️ Solar highway? Forgotten photovoltaic areas: How 13,000 kilometers of highway are supposed to save the German power grid

▶️ Take action yourself: Why energy autonomy is the best economic self-defense for households and small and medium-sized enterprises

▶️ Germany's new gas debate: What Jan Fleischhauer (Focus / Der schwarze Kanal) overlooks

▶️ The fatal gas trap: Why millions of German households are threatened with the next heating shock

▶️ Agri-PV or “Cow-PV”? Nestlé Biessenhofen: When cows generate solar power – Economic analysis of an integrated energy transition model

▶️ Decentralized energy transition and SMEs: How this decentralized energy strategy would have saved SMEs

▶️ The global energy lie: Why the alleged failure of the energy transition is just a fairy tale

▶️ The opportunistic expert Daniel Stelter – Germany's energy future between data reality and consultant narratives

▶️ The major subsidy contradiction after harsh criticism of the EEG: CDU minister now plans huge cost levy for gas-fired power plants

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