Published on: December 11, 2024 / Updated on: December 12, 2024 – Author: Konrad Wolfenstein
Untapped potential? New opportunities for solar power owners, especially in winter: Why Germany's energy storage systems could deliver more – Image: Xpert.Digital
Planned amendment to the Energy Industry Act: A milestone for energy storage in Germany
Current status of energy storage in Germany
In Germany, there are currently around 1.6 million stationary energy storage systems with a combined installed capacity of approximately 13 gigawatts. These storage systems are primarily used to buffer solar power from private photovoltaic systems for later use in the household. However, their enormous potential remains largely untapped. A planned amendment to the Energy Industry Act (EnWG) could bring about a decisive change by creating new legal opportunities for the more flexible use and marketing of energy storage systems. Whether this amendment will be implemented before the next federal election is uncertain given the current political climate. Nevertheless, the announcement of the amendment has raised high hopes among many stakeholders in the energy sector.
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Planned changes and their impact
The planned changes are specifically aimed at reducing legal hurdles that have so far limited the wider use of energy storage systems.
Especially in winter , when self-generated energy from photovoltaic systems is lower and the demand for electricity increases, it makes sense to use energy storage more efficiently and, for example, to use cheaper night-time electricity.
Until now, it was primarily the concern about retaining feed-in tariffs that deterred operators from storing more than just the green electricity generated by their own photovoltaic systems in their storage facilities. Anyone wanting to, for example, draw electricity from cheap wind power surpluses at night or feed excess solar power into the grid when prices are particularly attractive, has faced complex restrictions. The amendment aims to allow temporarily stored grid electricity to be fed back into the public grid without losing eligibility for feed-in tariffs. A simplified metering and billing system based on a flat-rate payment is proposed for this purpose. Specifically, the proposal suggests that up to 300 kWh per kWp per year could be compensated at a flat rate to simplify billing for both operators and energy suppliers. This measure is intended to incentivize better integration of storage capacities into the electricity market, thereby supporting a more stable supply and further promoting the integration of renewable energies.
Advantages of market integration of storage systems
The potential benefits are manifold. By strategically integrating storage systems into the market, it could be possible to smooth out peak loads on the grid, increase the self-consumption of renewable energies, and thus contribute to more efficient resource use. It's conceivable that in the future, homeowners will not only be able to use their self-generated solar power more flexibly, but also feed it into the grid for compensation during periods of high demand. This would transform the role of private storage systems from purely passive intermediate storage to an active element in the electricity system. The underlying idea is: the more decentralized storage systems participate in this flexibility sharing, the more stable and cost-effective the entire electricity system can be.
Challenges in implementation
Nevertheless, numerous challenges remain that must be considered during implementation. A key concern is the lifespan of the storage systems. More frequent use for market activities could potentially lead to more charge and discharge cycles, which in turn affects battery durability. Many currently available battery systems are designed for approximately 3,000 to 5,000 charge cycles. If the cycle frequency is significantly increased, this could shorten the lifespan and thus jeopardize the economic viability for operators. Technological advances in battery research, as well as new storage chemistries, such as those based on sodium ions or solid-state technologies, could mitigate this problem in the future, but some uncertainty remains at present.
Another crucial point is the technical implementation and measurement. Although a flat-rate compensation model is proposed, precisely distinguishing between locally generated solar power and electricity drawn from the grid is not straightforward. This is especially true when household consumption fluctuates or multiple generation and consumption units are interconnected. Smart metering systems, so-called smart meter gateways, are intended to remedy this and provide the necessary data. However, this will incur new costs, which would initially have to be borne by operators. It is therefore essential that the legislative amendment establishes practical regulations so that the effort required from individual households remains manageable and excessive investments are avoided. The goal is to enable the simplest possible entry into active electricity trading without overburdening operators with complex billing and metering technologies.
New business models and economic perspectives
From an economic perspective, the amendment could lead to a new business model for private households. Instead of focusing solely on saving on electricity costs, they could now generate revenue by providing flexibly available power. Theoretically, homeowners could participate in the so-called balancing energy market using their storage systems, provided that aggregators or service providers pool this capacity and make it available for grid stability. This would create a broader range of revenue streams: in addition to the traditional feed-in tariff for PV electricity, there would be compensation for providing balancing energy or short-term grid relief. In this context, the statement "energy storage will become the backbone of decentralized energy supply" could prove to be true in the future. Such a model would place the energy transition on a broader societal footing, because households would then be not only consumers but also active shapers of the energy system.
Political and economic uncertainties
At the same time, it cannot be denied that the planned legislative amendment is accompanied by political uncertainty. Approval of such a change is not only a question of technical feasibility, but also a significant political undertaking. The Federal Minister for Economic Affairs has already signaled his intention to pursue swift implementation. The ministry stated, in essence: "We must act now to fully exploit the potential of energy storage and guarantee security of supply in a dynamic energy landscape." However, whether this will actually be achieved before the next federal election is by no means certain, given the current political climate and the strained majority situation. The political situation is tense, not least because the energy transition affects a multitude of interests – from citizens' initiatives and industry to grid operators and energy suppliers. Furthermore, long-term energy and climate policy goals are at stake: Germany aims to significantly reduce its greenhouse gas emissions to meet international commitments and European climate targets. Storage plays a key role in this, as it helps to balance fluctuating renewable energy feed-ins.
Costs for operators and technical requirements
From an economic perspective, swift clarity is also desirable. Only when investors and operators know the framework within which they can operate and market their storage facilities in the future will they make the necessary investments. On the other hand, a hasty legislative proposal carries the risk of introducing immature regulations that will require subsequent revisions. It is therefore crucial to consider both the short-term feasibility and the long-term sustainability of the regulations. No one wants constant adjustments and legal uncertainties that could undermine confidence in the emerging market for storage technologies.
The question of what costs arise from the introduction of new metering technology and how these costs are distributed is particularly sensitive. If operators of photovoltaic systems or private storage facilities do not recognize the benefits, they will hardly be willing to install expensive metering and control technology. A balance must be struck here: On the one hand, the regulations should be as simple as possible to make market participation attractive for laypersons. On the other hand, a certain technological standard is necessary to prevent misuse and incorrect billing. This could mean introducing simplified standard models that do not require highly complex metering technology, for example, by using statistical generalizations or introducing certain threshold values below which no elaborate metering regime is necessary.
European context and long-term vision
Another often overlooked aspect is the role of energy storage within the context of European energy market integration. Germany is part of the European electricity grid, and with the increasing internationalization and harmonization of energy markets, domestic storage facilities could become relevant not only for German but also for European electricity trading in the long term. Flexibilities can theoretically be marketed across borders, provided the regulatory framework allows it. This raises new questions, such as the harmonization of standards, the avoidance of double taxation, and the consideration of differing national support schemes. A future-proof amendment to the German Energy Industry Act (EnWG) should therefore consider not only the national environment but also the European context.
Potential and significance of the planned amendment to the Energy Industry Act
If a viable compromise can be found, the legislative amendment could catalyze a new era of energy use. Instead of passively receiving electricity, households would become active market participants, contributing to grid stability through intelligent management of their storage systems. In the medium term, this could lead to the development of new business models in which service providers sell aggregated storage capacities to grid operators or industrial companies. Industry itself could also benefit from decentralized storage capacities, for example, by making production processes more flexible to avoid peak loads. The social and economic effects would be considerable: If these potentials can be realized, the energy transition as a whole could become more cost-effective, more resilient, and thus more acceptable to broad segments of the population.
Of course, it remains to be seen whether and in what form the planned amendment will come into force. However, the discussion is already sending a strong signal: it shows that energy storage is no longer seen merely as a technical accessory for solar power systems, but as an essential component of a future-proof energy system based on renewable energies. The future of energy supply lies in flexible, decentralized structures in which storage plays a key role. "Energy storage is the key to channeling the volatile feed-in of renewable energies into a more orderly system and accelerating the transition to a climate-neutral energy supply," is the gist of the assessment from some industry experts. If the bridge between politics, technology, and business can be built, this vision will become reality faster than many currently expect.
The amendment to the Energy Industry Act thus appears as a strategically important signal at a time when the energy system is reinventing itself. Technological, regulatory, and economic hurdles undoubtedly exist, but the opportunities outweigh them from many perspectives. Intelligent, flexible use of storage could make the German energy system more resilient, efficient, and sustainable – and thus set an example for other countries that face similar challenges on their path to greater climate protection and security of supply. In short: The amendment is not just a footnote in the law, but potentially a milestone in the history of Germany's energy transition.
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