Small Hydropower Plants: Energy Recovery and Environmental Integration
Spike Renewables operates in the design and development of small run-of-river hydropower plants, with particular attention to energy recovery from existing hydraulic drops and the enhancement of pre-existing river infrastructures, such as weirs and low dams. The activities cover the entire technical and permitting process, from feasibility studies to detailed design, as well as support for concession procedures and environmental assessments. The experience gained involves small- to medium-scale plants, located in regulated river contexts with high environmental sensitivity.
Design Approach and Use of Existing Structures
The small hydropower plants developed by Spike Renewables are designed to exploit modest hydraulic drops, typically between 1.5 and 4 meters, avoiding the construction of new barrier structures. Water diversion takes place immediately upstream of existing weirs, with full flow returned downstream, without bypassing significant river stretches or altering the hydraulic regime. This approach minimizes civil works, limits territorial impact, and enhances existing infrastructure, often originally built for water regulation purposes.
Hydrological, Hydraulic, and Energy Production Analysis
Plant design is always preceded by detailed hydrological and hydraulic studies, based on flow duration curve analysis, assessment of available net heads, and compliance with Minimum Vital Flow (MVF) requirements. Diverted flows are determined to optimize annual energy production without oversizing structures, ensuring efficient use of water resources. Developed plants typically have nominal powers between 20 and 60 kW, with annual energy production on the order of 100,000–200,000 kWh per site, and high overall efficiency for the reference category.
Screw Turbine Technology for Low Heads
A significant portion of the projects has involved the use of Archimedes screw turbines, particularly suitable for low heads and variable flows. This technology maintains high efficiency even at partial loads, reduces the need for complex mechanical regulation, and offers notable operational robustness. Screw turbines are also inherently fish-friendly, tolerate the passage of small solid materials, and allow simplified intake structures, avoiding fine-mesh screens and complex screening systems.
Environmental Integration and Mitigation Measures
A central aspect of the projects is environmental integration. Spike Renewables has developed solutions including enhanced MVF release, construction of naturalistic fish passages, and landscape restoration of construction areas. The works are designed to be largely underground or integrated into riverbanks, using materials and geometries consistent with the existing context, minimizing visual impact and preserving ecological continuity of the watercourse.
Concessions, Permitting, and Regulatory Compliance
Activities also include support for public water diversion concession applications, verification of Environmental Impact Assessment (EIA) requirements, and preparation of compliance reports with river basin plans, hydrogeological planning instruments, and territorial planning tools. This integrated approach allows for a structured handling of regulatory and environmental issues, reducing permitting risks and ensuring project alignment with the current regulatory framework.