{"id":34054,"date":"2026-08-25T14:12:30","date_gmt":"2026-08-25T12:12:30","guid":{"rendered":"https:\/\/cubeconcepts.de\/?p=34054"},"modified":"2026-08-25T14:12:32","modified_gmt":"2026-08-25T12:12:32","slug":"electricity-submeter","status":"publish","type":"post","link":"https:\/\/cubeconcepts.de\/en\/strom-zwischenzaehler\/","title":{"rendered":"Sub-electricity meters as the basis for metering concepts in companies"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Brief overview<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>electricity submeter<\/strong> is the basis of every commercial measurement concept for PV systems and battery energy storage systems (BESS). It records the energy flow at a specific point within a property \u2013 in addition to the main meter at the grid connection point. Companies use it to separately visualize the consumption and generation of individual building areas, individual systems, or individual users and <strong>Own consumption<\/strong>, <strong>third-party consumption<\/strong> and <strong>Feed-in<\/strong> clearly distinguishable from each other.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is a sub-meter for electricity?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A sub-meter is a measuring device that <strong>downstream main meter<\/strong> is installed within a property and records the energy flow at a defined metering point. This can be the consumption of a building section or major consumer, as well as the generation of a PV system or the charging\/discharging power of a battery storage system. It does not replace the main meter, but rather complements it with <strong>an additional measurement plane<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For differentiation:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Main meter<\/strong>measures the total electricity consumption or total feed-in at the grid connection point. It forms the basis for billing with the grid operator and energy supplier and is always subject to mandatory calibration.<\/li>\n\n\n\n<li><strong>Sub-meter<\/strong>: measures a subset of consumption or generation within the property, downstream of the main meter.<\/li>\n\n\n\n<li><strong>Submeter<\/strong>: In practice, this term is often used interchangeably with \u201cintermediate meter.\u201d In some metering concepts, however, the term is defined more narrowly\u2014to refer to meters used exclusively for internal cost control and that have no billing implications for third parties. There is no uniform definition; in each specific case, the meter\u2019s function is always the decisive factor, not its name.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Legal framework: Calibration law and metrology<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Whether an intermediate meter must comply with calibration regulations does not depend on its designation, but rather on its use. The Measurement and Calibration Act (MessEG) and the Measurement and Calibration Ordinance (MessEV) are the governing regulations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Principle:<\/strong> A measuring instrument is subject to mandatory verification if it is used in commercial transactions to determine a fee that is billed to a third party.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For practice, this means two categories of cases:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Relevant for billing (subject to verification):<\/strong> The submeter forms the basis for billing costs to a third party. This can be tenants within the scope of tenant electricity, a group company, or participants in an energy-sharing community. In these cases, the meter must comply with calibration law (MID-compliant or approved under national calibration law).<\/li>\n\n\n\n<li><strong>For information purposes only (not subject to legal verification):<\/strong> The submeter is used exclusively for internal monitoring or controlling. This might be necessary, for example, to track the energy consumption of individual production lines as part of energy management without generating a bill for third parties. In this case, a non-calibrated meter is sufficient.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This distinction is particularly important for PV and BESS projects: A submeter that was initially intended only for internal monitoring can become subject to calibration laws as soon as it is later used as a billing basis for tenant electricity or energy sharing \u2013 the technical equipment should take this into account from the very beginning.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Relevance of intermediate electricity meters in PV &amp; BESS operation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">As soon as a <a href=\"https:\/\/cubeconcepts.de\/en\/photovoltaics\/\" data-type=\"page\" data-id=\"28902\">PV system<\/a> or a <a href=\"https:\/\/cubeconcepts.de\/en\/battery-storage\/\" data-type=\"page\" data-id=\"28816\">Battery storage<\/a> comes into operation, the pure import meter or main meter at the grid connection point is no longer sufficient to track the flow of energy within the company. Submeters close this gap on multiple levels\u2014both on the consumption and the generation side.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Separate tracking by building area (consumption)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For rented or multi-user properties \u2013 such as business parks, hall complexes with multiple tenants, or corporate locations with several companies \u2013 a submeter makes it visible how much electricity is attributable to which part of the building. This is a prerequisite for models such as the <strong><a href=\"https:\/\/cubeconcepts.de\/en\/the-tenant-electricity-model\/\" data-type=\"post\" data-id=\"26455\">Tenant electricity model<\/a><\/strong> or the <strong><a href=\"https:\/\/cubeconcepts.de\/en\/the-communal-building-supply-ggb\/\" data-type=\"post\" data-id=\"26470\">Communal building supply<\/a><\/strong>, in which PV electricity is shared proportionally among multiple users within a property.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Separate collection by major consumers (consumption)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cubeconcepts.de\/en\/e-mobility-charging-infrastructure-as-an-opportunity-for-companies\/\" data-type=\"post\" data-id=\"4842\">Charging infrastructure<\/a> for electric vehicles, heat pumps, or individual production plants, [they] can be recorded separately using dedicated sub-meters. This creates the data basis required to specifically allocate the self-consumption share from the PV system to individual major consumers \u2013 for example, for internal cost accounting or to make the effect of load shifting visible.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Separate tracking of generation (PV) and charging\/discharging power (BESS)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Just as important as the consumption side is the generation side. A sub-meter for electricity at the inverter output records PV generation independently of the property's total consumption. Only in this way is it possible later to clearly distinguish between self-consumption, surplus feed-in, and grid power purchase. In the case of a battery energy storage system, the charging and discharging direction is added. A dedicated sub-meter at the BESS interface makes visible how much energy is flowing in which direction, and thus forms the basis for the correct allocation of quantities relevant to self-consumption, feed-in, and redispatch.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Separate recording by user<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For multiple consumers within a property \u2013 tenants, group companies or participants in a <strong><a href=\"https:\/\/cubeconcepts.de\/en\/energy-sharing-in-germany-42c-enwg\/\" data-type=\"post\" data-id=\"32362\">Energy Sharing<\/a><\/strong>- merger pursuant to Section 42c of the German Energy Industry Act (EnWG) \u2013 user-specific consumption recording is mandatory as soon as the PV or BESS electricity is to be billed on a proportional basis. The submeter is the technical prerequisite here for legally compliant billing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Just in case, the allocation logic: Who measures what, at which point, and in which direction. This creates overall transparency of consumption and generation as well as the basis for the measurement concept underlying the PV and BESS project.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The electricity submeter as a component in the metering concept<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What is a metering concept?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A metering concept specifies at which points on a property specific amounts of energy are measured and how consumption, generation, self-supply, and grid withdrawal or feed-in are calculated based on those measurements. It serves as the technical and contractual basis for grid operators, energy suppliers, tax authorities (e.g., for electricity or sales tax exemptions), and third parties (<a href=\"https:\/\/cubeconcepts.de\/en\/third-party-delimitation\/\" data-type=\"post\" data-id=\"9733\">Third-party quantity delimitation<\/a>) be able to clearly trace the energy flow. Without a coherent measurement concept, neither self-consumption can be correctly delineated nor regulatory benefits reliably claimed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Interplay of Counting Levels<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In a property with a PV system and BESS, several meters typically work together:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Import meter (main meter): measures the electricity drawn from the public grid<\/li>\n\n\n\n<li>Feed-in meter: measures the amount of electricity that is fed back into the public grid<\/li>\n\n\n\n<li>Generation meter (submeter at the PV inverter): measures total PV generation, regardless of whether the electricity is consumed directly, stored, or fed into the grid<\/li>\n\n\n\n<li>BESS meter (submetering at the storage interface): measures charging and discharging power separated by direction<\/li>\n\n\n\n<li>Sub-meters for consumption: record the consumption of individual building areas, major consumers, or users within the property<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The complete picture emerges from the joint consideration of the levels. The difference between generation, grid import, and grid feed-in yields self-consumption. The total self-consumption of the property can be calculated from the PV generation meter, import meter, and feed-in meter. Only the intermediate consumption meters break this self-consumption down further \u2013 to individual building areas, major consumers, or users.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Example measurement concept: PV + BESS with multiple loads<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A typical scenario in practice: A commercial property with a rooftop PV system, a battery storage system, and three rental units.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Measurement point<\/strong><\/td><td><strong>Meter type<\/strong><\/td><td><strong>Function<\/strong><\/td><td><strong>metrological verification obligation<\/strong><\/td><\/tr><tr><td>Grid connection point (supply)<\/td><td>Main meter<\/td><td>Total electricity drawn from the grid<\/td><td>Yes<\/td><\/tr><tr><td>Grid connection point (feed-in)<\/td><td>Main meter<\/td><td>Feeding Surplus Electricity into the Grid<\/td><td>Yes<\/td><\/tr><tr><td>PV Inverter<\/td><td>Interim Generation Meter<\/td><td>Total PV Generation<\/td><td>Yes, as soon as it is relevant for billing<\/td><\/tr><tr><td>BESS Interface<\/td><td>Sub-meter<\/td><td>Storage Charging\/Discharging Capacity<\/td><td>No for internal monitoring, Yes for grid feeding<\/td><\/tr><tr><td>Rental Units 1\u20133<\/td><td>Interim Consumption Meter<\/td><td>Consumption per Rental Unit<\/td><td>Only for tenant electricity billing<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"535\" src=\"https:\/\/cubeconcepts.de\/wp-content\/uploads\/2026\/08\/Zaehler-Konzept-1024x535.jpg\" alt=\"\" class=\"wp-image-34055\" srcset=\"https:\/\/cubeconcepts.de\/wp-content\/uploads\/2026\/08\/Zaehler-Konzept-1024x535.jpg 1024w, https:\/\/cubeconcepts.de\/wp-content\/uploads\/2026\/08\/Zaehler-Konzept-300x157.jpg 300w, https:\/\/cubeconcepts.de\/wp-content\/uploads\/2026\/08\/Zaehler-Konzept-767x401.jpg 767w, https:\/\/cubeconcepts.de\/wp-content\/uploads\/2026\/08\/Zaehler-Konzept-18x9.jpg 18w, https:\/\/cubeconcepts.de\/wp-content\/uploads\/2026\/08\/Zaehler-Konzept.jpg 1347w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This concept makes it clear that not every intermediate electricity meter in the system has the same legal significance. The BESS intermediate meter is used primarily for internal control and analysis, while the intermediate meters at the rental units are directly relevant to billing and are therefore subject to calibration requirements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Technical Design of Intermediate Electricity Meters<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Types<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Today, intermediate electricity meters are predominantly digital measuring devices; mechanical Ferraris meters are rarely used in new installations. For billing-related applications, the devices must <strong>MID-compliant<\/strong> \u2014that is, approved in accordance with the Measuring Instruments Directive (2014\/32\/EU) and bearing a valid conformity marking. For intermediate meters used solely for informational purposes, a standard, non-calibrated meter is sufficient; however, it should ideally offer the same interface technology as the meters that comply with metrology regulations\u2014so that both types of meters can be analyzed within the same system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Connection and Data Collection<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For integration into an energy management system (EMS) or billing software, submeters require a digital interface:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Modbus RTU\/TCP<\/strong> Communication via RS-485 or Ethernet is the most widely used standard in commercial and industrial applications\u2014it is robust, vendor-neutral, and natively supported by most EMS and storage controllers.<\/li>\n\n\n\n<li><strong>S0 Interface<\/strong> (Pulse output) can be found in simpler meters, but only provides counting pulses without further measured values such as voltage or power factor.<\/li>\n\n\n\n<li><strong>Smart Meter Gateway Capability<\/strong>: Meters that are intended to be connected to a smart meter gateway (SMGw) in the future require a compatible interface that meets the BSI\u2019s technical specifications\u2014this becomes relevant as soon as a submeter is also used for accounting purposes under the Metering Point Operations Act (MsbG).<\/li>\n\n\n\n<li><strong>Radio\/Wireless Connection<\/strong> (e.g., Wireless M-Bus) is a good option in situations where wiring would be structurally complex\u2014such as when retrofitting submeters in existing rental units.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Integration into an energy management system<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It is only through digital connectivity that intermediate electricity meters can deliver their full benefits for PV and BESS operations. The EMS reads the measurements from all intermediate meters in real time or at short intervals (typically 1\u201315 minutes) and uses them for two purposes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Control<\/strong>: The BESS submeter provides the EMS with actual values for charging and discharging power, which are used to calculate charging and discharging strategies (e.g., optimization of self-consumption, peak load shaving).<\/li>\n\n\n\n<li><strong>Billing and Reporting<\/strong>Intermediate utility meters provide the data basis for tenant electricity billing, internal cost center reports, or documentation for grid operators and tax authorities.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Important for planning: The choice of interface should not be made in isolation for each meter. It should be based on the overall metering concept\u2014subsequently changing the communication technology for meters that have already been installed involves additional effort.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Real-World Use Cases<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Use Case<\/strong><\/td><td><strong>Purpose of the submeter<\/strong><\/td><td><strong>metrological verification obligation<\/strong><\/td><\/tr><tr><td>Tenant electricity<\/td><td>Consumption recording per rental unit as the basis for electricity cost billing to tenants<\/td><td>Yes<\/td><\/tr><tr><td>Communal building supply<\/td><td>Consumption recording per supplied unit within the property for proportional cost allocation<\/td><td>Yes<\/td><\/tr><tr><td>Energy Sharing (\u00a7 42c EnWG)<\/td><td>Consumption and generation recording per participant for the legally secure allocation of shared PV quantities<\/td><td>Yes<\/td><\/tr><tr><td>EV charging infrastructure billing<\/td><td>Separate recording of the charging current, e.g. for billing to employees, tenants or fleet customers<\/td><td>Yes, as soon as billing involves third parties<\/td><\/tr><tr><td>Internal cost center allocation<\/td><td>Allocation of consumption to departments, production lines, or locations for internal controlling<\/td><td>No<\/td><\/tr><tr><td>Load management pursuant to Section 14a of the Energy Industry Act (EnWG)<\/td><td>Recording of the reference power of controllable consumer devices (e.g., wallboxes, heat pumps) for grid-serving control<\/td><td>No, unless it is also relevant for billing purposes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Main meter vs. intermediate meter vs. sub-meter at a glance<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><\/td><td><strong>Main meter<\/strong><\/td><td><strong>Sub-meter<\/strong><\/td><td><strong>Submeter<\/strong><\/td><\/tr><tr><td>Function<\/td><td>Measures total power consumption or total feed-in at the grid connection point<\/td><td>Measures the energy flow at a defined measuring point within the property (consumption or generation)<\/td><td>In practice, mostly used synonymously with intermediate meter; sometimes defined more narrowly for purely internal meters without relevance for billing<\/td><\/tr><tr><td>Position<\/td><td>Right at the grid connection point<\/td><td>Downstream of the main meter, e.g., at the PV inverter, BESS interface, or load area<\/td><td>downstream of the main meter or the submeter<\/td><\/tr><tr><td>metrological verification obligation<\/td><td>Always<\/td><td>Depending on the intended use \u2013 mandatory if relevant for billing to third parties<\/td><td>Like sub-meters: depending on the intended use<\/td><\/tr><tr><td>Billing relevance<\/td><td>Basis for billing with network operator and energy supplier<\/td><td>Basis for internal or external cost allocation, depending on the use case<\/td><td>Mostly internal monitoring, no billing to third parties<\/td><\/tr><tr><td>Typical example<\/td><td>Meter at the main service distribution board<\/td><td>Meter at rental unit, PV inverter or BESS<\/td><td>Meter for cost center analysis of a single machine<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ on intermediate electricity meters<\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Does every sub-meter require calibration?<\/summary>\n<p class=\"wp-block-paragraph\">No. Calibration is only required if the sub-meter forms the basis for billing costs to a third party \u2013 such as in tenant electricity supply, joint generation and consumption (GGV), or energy sharing. If the meter is used exclusively for internal monitoring, calibration is not mandatory.<\/p>\n<\/details>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Who bears the costs for submeters in tenant electricity?<\/summary>\n<p class=\"wp-block-paragraph\">That depends on the specific tenant electricity contract. In practice, the costs are frequently borne by the system operator and calculated into the electricity price. However, they can also be listed separately. There is no statutory requirement regarding the distribution of costs.<\/p>\n<\/details>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Does a sub-meter replace the main meter?<\/summary>\n<p class=\"wp-block-paragraph\">No. The sub-meter supplements the main meter with an additional measurement level within the property, but does not replace it. The main meter remains decisive for billing with the grid operator and energy supplier.<\/p>\n<\/details>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Can a submeter subsequently become subject to mandatory verification?<\/summary>\n<p class=\"wp-block-paragraph\">Yes. If an initially purely informative submeter is later used as a basis for billing \u2013 for example, because a tenant electricity model is introduced \u2013 it must comply with calibration laws from that point on. This should be taken into account from the very beginning when making the technical selection.<\/p>\n<\/details>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What role does the submeter play in the smart meter rollout?<\/summary>\n<p class=\"wp-block-paragraph\">Submeters are not directly covered by the smart meter rollout according to the MsbG (Metering Point Operation Act), as this primarily concerns the metering point at the grid connection. However, if submeter data is to be integrated into the smart meter gateway at a later stage, a compatible interface is advisable right from the selection process.<\/p>\n<\/details>","protected":false},"excerpt":{"rendered":"<p>You create the necessary transparency to clearly record and separate consumption, PV generation, and battery storage in companies. This article shows which meters are subject to calibration law and why the metering concept is crucial even during the planning of PV and BESS projects.<\/p>","protected":false},"author":3,"featured_media":34061,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[61],"tags":[],"class_list":["post-34054","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-grundlagen-technik"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Strom-Zwischenz\u00e4hler: Basis f\u00fcr Messkonzepte im Unternehmen | CUBE CONCEPTS<\/title>\n<meta name=\"description\" content=\"Strom-Zwischenz\u00e4hler erfassen Verbrauch und Erzeugung einzelner Bereiche, Ger\u00e4te oder Nutzer als zentraler Baustein jedes Messkonzepts.\" \/>\n<meta name=\"robots\" content=\"index, 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