Decentralization of energy supply

Decentralization of energy supply is changing how electricity and heat are generated, distributed, and used. From rooftop photovoltaics to neighborhood storage to microgrids, generation is moving closer to consumption. This has practical consequences for planning, construction, and deconstruction of in-service infrastructure: buildings, shafts, foundations, routes, and systems must be retrofitted, expanded, or selectively deconstructed. This is precisely where energy and construction technology meet. Tools and methods from Darda GmbH – such as concrete demolition shears or hydraulic wedge splitters – are used in the applications mentioned when low vibration levels, precision, and material separation are required. In brownfield environments, low-vibration and low-dust approaches support continuity of operations and protect sensitive assets.

Definition: What is meant by the decentralization of energy supply?

Decentralization refers to shifting energy generation and storage away from a few central large power plants toward many smaller, distributed units. These include photovoltaic systems on buildings, onshore wind power, biomass, geothermal and small hydropower plants, combined heat and power units, battery storage as well as load management and sector coupling (power, heat, mobility). Characteristic features are short transport distances, modular scalability, grid stability through intelligent control, and integration into neighborhoods and industrial sites. Technically, this requires construction adjustments: new foundations, cable ducts, transformer stations, shafts, openings and breakthroughs, noise control and fire protection – often in existing structures and during ongoing operations. The overarching goals include improved resilience, reduced transmission losses, and flexible, stepwise expansion.

Infrastructure and construction processes for distributed generation and storage

Decentralized systems need physical infrastructure in the immediate vicinity of consumers. In existing structures, this means selective interventions in concrete, masonry, steel, and natural stone, precise openings, and low-vibration dismantling. In the application areas concrete demolition and special deconstruction, building gutting and concrete cutting, rock excavation and tunnel construction, natural stone extraction, and special demolition, specialized tools from Darda GmbH are used.

Key planning parameters typically include:

• Material and component structure (concrete strength classes, reinforcement density, embedded parts)
• Accessibility, lifting and transport routes, and working envelopes in confined spaces
• Permissible emissions (dust, noise, vibration) and time windows for work
• Continuity of operations, temporary works, and structural load paths during interventions

Foundations, cable ducts, and switch rooms

New transformers, inverters, or battery storage units require load-bearing foundations, installation areas, and accessible control cabinets. In existing buildings, this entails openings, recesses, and niches. Concrete demolition shears enable controlled notching of reinforced components with low dust and noise emissions; Hydraulic rock and concrete splitters separate massive components with low stress, for example during foundation enlargements. Hydraulic shears and cutting tools help separate heterogeneous layers of concrete, reinforcement, and embedded parts. Hydraulic power packs provide the required power supply for these tools, even in confined conditions. Where reinforcement is dense, rebar scanning, pre-cutting, and segmented removal reduce loads on the remaining structure.

Underground networks and microgrids

Medium-voltage and control lines require shafts, horizontal drilling, and ducts. In cities or rocky subsoil, low vibration levels are crucial. Rock Splitters are suitable for precise rock breakout operations, while concrete demolition shears cut through existing shaft heads and slabs without overstressing adjacent components. In rock excavation and tunnel construction, this supports short construction times and safe installation of cable routes and microgrid components.

Selective deconstruction as the key to retrofits

Retrofitting existing buildings for distributed generation requires selective deconstruction. The goal is to remove exactly those components that must make way for a decentralized solution while maximizing preservation of the load-bearing structure. Concrete demolition shears support this approach through metered, low-constraint removal. Hydraulic wedge splitters are used when massive elements such as machine foundations or thick pedestals need to be split with minimal damage. Temporary supports and defined separation cuts maintain load paths and limit collateral effects.

Typical workflows in existing structures

• Survey, structural analysis and utility line checks, defining the cut lines
• Building gutting and concrete cutting of claddings, shafts, non-load-bearing walls, and installations
• Selective separation of reinforcement and steel beams with steel shears and hydraulic shears
• Removal, sorting, and haulage for recycling
• Creating new openings, bearings, and installation surfaces for decentralized components
• Implementation of dust, noise, and vibration controls with spot measurements and documentation
• Final inspection, handover, and as-built updates for penetrations and routes

Low-noise and low-vibration methods in urban environments

Neighborhood solutions, district heating, and rooftop PV often arise in densely built areas. Construction methods there must protect the surroundings. Hydraulic wedge splitters generate no impact oscillations like breaker hammers, reducing vibration and protecting adjacent components. Concrete demolition shears reduce secondary breakage and dust because they nibble material in a controlled manner instead of shattering it. This helps minimize emissions and avoid disturbing sensitive environments – such as laboratories, data centers, or ongoing production areas. Typical acceptance criteria include vibration velocity limits in mm/s and defined sound pressure limits in dB(A).

• Water-assisted cutting and wet suppression to reduce airborne dust
• Local enclosures with negative pressure and filtered extraction
• Sequenced pre-splitting to limit energy input and structural excitation
• Real-time monitoring with threshold alarms for vibration and noise

Technological fundamentals and grid integration

Decentralized systems combine generators (PV, wind, CHP), storage (batteries, thermal storage), and control (energy management, load shifting). For construction integration, the steps typically include: creating space, cable routing, foundation work, installation, and commissioning. Each step places specific demands on tools and methods. Hydraulic power packs supply concrete demolition shears, hydraulic shears, and cutting tools with power so that precise openings for conduits, ventilation, and firestops can be created. In concrete demolition and special demolition, this achieves the required penetrations for grounding systems, cable handover points, and transformer pits, while meeting emission and safety constraints.

Interfaces in the microgrid

Power feed-throughs, busbar rooms, and transformer cells require defined edges, tolerances, and surfaces. Tools from Darda GmbH enable processing close to edges without large-scale damage. This facilitates subsequent lining with fire protection components and the precise installation of equipment. Millimeter-level tolerances and clean surfaces support sealing, EMC concepts, and maintainability.

Safety, environment, and permitting in the context of decentralized systems

Construction and deconstruction works around electrical installations require a systematic safety concept. This includes utility power isolation, grounding, coverings, barriers, and a low-dust approach. Water and soil protection must be considered for foundation work and cable trenches. Legal requirements, standards, and authority conditions may vary by project; early coordination is advisable and should be project-specific. The separation of construction materials promotes resource conservation and supports compliance with environmental requirements. Hot-work permits, lockout-tagout procedures, confined-space rules, and time-window restrictions are to be integrated into method statements.

• Defined responsibilities, toolbox talks, and briefing of crews on residual risks
• Spill prevention and capture systems for oils and processing water
• Measurement plans for dust, noise, and vibration with acceptance criteria

Handling tanks and media-carrying components

When deconstructing old heating oil or process collection tanks and converting to new storage systems, controlled, function-appropriate separation is required. Cutting torches and steel shears can help safely cut tank shells, manways, and connections. Before starting, residual media must be removed, potential gases checked, and suitable protective measures defined. Work should aim for minimal spark generation, suitable dust extraction, and orderly material removal. Where required, gas-free certification, inerting, and continuous gas monitoring increase safety.

Circular economy and urban mining in the energy sector

Concrete demolition shears allow removal of reinforcement covered by concrete so that steel can be recycled and concrete broken and reused. Steel shears cut profiles and beams by type. With hydraulic wedge splitters, natural and concrete stones can be released in defined formats, simplifying transport and processing. This shortens disposal routes and improves the project’s carbon footprint. Documented material flows and clean separation support recycling targets and environmental declarations.

Practice-oriented project scenarios

The following scenarios show typical interfaces between decentralized energy and construction implementation:

• Neighborhood storage and district heating: Construction of transformer pits, a foundation slab, and wall openings in existing basements. Concrete demolition shears minimize vibration, while cable cutting tools cut utility line bundles and anchors.
• Rooftop PV with battery storage: Openings for riser shafts, load reduction on the floor slab, local reinforcements. Hydraulic wedge splitters split thicker upstands without significantly affecting the waterproofing layer.
• Onshore wind and small hydropower: Adaptation of foundations, cable shafts, and intake areas. Rock wedge splitters and concrete demolition shears enable precise interventions in rock and concrete.
• Industrial retrofit: Deconstruction of boiler installations, tanks, and steel platforms in favor of CHP units or electrified processes. Steel shears and cutting torches separate steel components, while hydraulic shears process composite structures.

Selection of tools and methods in the context of project goals

The selection depends on material, component thickness, degree of reinforcement, accessibility, and emission requirements. Concrete demolition shears are suitable for reinforced components requiring precise edges and minimal edge breakouts. Hydraulic wedge splitters play to their strengths on massive, thick components when vibration and noise must be limited. Hydraulic shears and cutting tools offer flexibility with changing materials, steel shears provide high cutting performance in metal, and cutting torches support proper disassembly of enclosed vessels. Hydraulic power packs must be planned so that the project’s power demand, accessibility, and emission requirements are met. Compatibility with carrier equipment and logistics on site further influences productivity and risk.

Coordination with grid operators and construction sequence

Work on or near electrical installations should be coordinated with shutdown windows, wiring diagrams, and acceptance processes. A methodical approach – from defining the separation cuts to the sequence of dismantling through to final cleaning – shortens downtime and facilitates commissioning of microgrids, storage, and control technology. Clear hold points, inspections, and handover criteria reduce rework and interface risks.

Quality assurance and documentation

Measurable quality goals (cut edges, flatness, tolerances) and environmental goals (dust, noise, vibration) should be defined and monitored. This includes protocols for construction waste sorting, evidence of proper disposal, photo documentation, and as-built documentation for cable routes and openings. Clean documentation supports later maintenance operations of decentralized systems and improves operational safety.

• Inspection and test plans with defined acceptance thresholds and sampling rates
• Geotagged photos and measurement logs for penetrations, ducts, and terminations
• As-built models or plans reflecting final routing and firestopping
• Closure reports confirming material separation, quantities, and disposal paths