Inspired by the Egura Youth Challenge Uharte 2025, where six teenagers (5 of 15 years, 1 of 13) (5 of 15 years, 1 of 13) from Uharte, Navarra, developed a functional model integrating elevated photovoltaic panels with mini wind energy, this study explores a hybrid solar-wind system to optimize energy production and agricultural land use. Traditional photovoltaic fields, mounted centimeters above potential agricultural soils, limit land multifunctionality. The proposed hybrid system elevates panels on 3 - 4 m posts to preserve soil for farming or grazing, reduces dust accumulation and panel temperatures, while integrating mini VAWTs under each panel wind energy for complementary potential continuous generation. Since the first decades of solar panels use, authors like Shockley and Queisser [1] have been always proposing ideas to improve efficiency, in this 1961 case was about the hardware itself of the solar panels; in our case it is only a slightly modification of configuration of space use in nowdays solar panels fields at global scale.

This Short Communication compares Unit A (photovoltaic-only) and Unit B (hybrid solar-wind) models across different area scales and latitudes, projecting global impacts on energy production and food security, supported by established methodologies in renewable energy and land use optimization.

A functional 1 m² prototype of the Egura model for photovoltaic and wind generation was assembled by hand by the teenage participants over 8 hours across eight different days (1 hour each) from March to August 2025. Components were sourced from the Amazon online store ( Table 1 ). An Ermenrich Ping MK20 ammeter (DC voltage measurement limits: 400 mV/4 V/40 V/400 V/600 V; error ±(0.5% + 5) measured energy outputs from both units. LEGO® blocks were used to construct elevated posts for Unit B. Thermosolar data (magnifiers + mini heliostats/boiler + microhydroturbine) were excluded, as that aspect remains in progress.) Functional 1 m² model of Egura Approaches for thermosolar, photovoltaic and wind generation was built in just 8 h (1 h during 8 differents days from march to august 2025). Amazon online store provided these models and instrument: -Six (6) 3V 0.3W (65 × 48 mm) Micro Solar Panel Cells, Solar Energy, Brand: GTIWUNG, Material: Polycrystalline Silicon. Three (3) Wind Electricity Generator, 0.55W 5.5m/s Mini Wind Turbine Generator Kit Vertical Wind Generator Teaching Model, Brand Jadeshay; Product Dimensions: length x width x height - 7 × 6 × 2 centimeters. The prototype measurements (0.2 mV for Unit A vs. 0.3 mV for Unit B, averaged over tests on August 24 and 31, 2025 indicated ~50% higher output for the hybrid configuration, attributable to the additive wind contribution under elevated panels.) Egura Youth Model Challenge measured outputs for the area of 65 × 48 mm multiplied by 3: 1. Area = 65 mm × 48 mm = 3,120 mm² 2. Area × 3 = 3,120 mm² × 3 = 9,360 mm² for both Unit A and Unit B areas. Unit A ( Figure 1 ): 3 mini solar panels directly on the ground: 0,2 mV Unit B ( Figure 2 ): 3 mini solar panels elevated with aerogenerators attached beneath: 0.3 mV. The direct measurement within our educational model shows grosso modo 50% more energy potential in Unit B (hybrid model proposed). We made measurements in two consecutive sundays of 2025 (August 24th & 31th). This was expectable adding two sources of energy in a singular vertical axis point or geographical site dot. As we did not carry out a long-term study with sufficient data for statistical analysis, we use Grok X’s AI tool to project our proposed hybrid model to a world scale using real data published in scientific indexed journals.

Due to the preliminary nature of these small-scale experiments (insufficient data for statistical analysis), scaling to realistic configurations and global projections was performed using Grok 3, an AI model developed by xAI. Grok 3 integrated the prototype ratios with published climatic parameters, applying established formulas for solar and small wind production to simulate outcomes across scales and locations.

Configurations were scaled linearly from the Egura prototype to market-realistic systems, maintaining the same land area coverage for fair comparison.) We projected different configurations of the Nano Model of Egura upto realistic existing models in the actual markets of renewable technologies fields.

Unit A (Photovoltaic-Only): Panels: 200 W, ~2 m², 20% efficiency, ground-mounted, covering 50% of the area to avoid shading. Nominal capacity: 100 panels/ha (50,000 W/ha = 0.05 MW/ha). Production: P_solar = Capacity × (GHI/1 kWh/m²), where GHI is global horizontal irradiation. Panels (200 W, ~2 m², 20% efficiency, ground-mounted cover 50% of the area to avoid shading. Nominal capacity: 100 panels/ha (50,000 W/ha = 0.05 MW/ha). Production: Psolar=P_{text{solar}} =P_{text{solar}} =

Capacity × GHI (kWh/m²/day), yielding MWh/day (Šúri et al., 2007). Land beneath is unusable for agriculture.) Unit B (Hybrid Solar-Wind): Same number of panels (100/ha, 0.05 MW/ha solar) elevated 3 - 4 m on posts, with one proportional mini VAWT (~50 - 200 W rated, swept area ~1 m², Cp = 0.3) mounted under each panel at ~3 m height. This allows full agricultural or grazing use beneath. Solar production assumes +5 - 10% efficiency gain from reduced dust/temperature (Solanki et al., 2020); for simplicity, we use baseline P_solar.

Wind: Pwind = 12ρAvh3Cp × 100P_{text{wind}} = frac{1}{2} rho A v_h^3 C_p times 100P_{text{wind}} = frac{1}{2} rho A v_h^3 C_p times 100

(W/ha average power, A = 1 m²/turbine, v_h = v_{10} times (3/10)^{0.2} approx 0.833 v_{10}, α = 0.2; daily energy = P_wind × 24 h, assuming continuous operation (Anvari et al., 2016)).

Total density scales linearly with area; no wake losses assumed (spacing >5 rotor diameters). Shading/dust losses assumed zero for ideal conditions; a sensitivity check indicates 10% losses reduce Unit B output by ~8% but maintains 15 - 40% superiority over Unit A in tested sites. 24 h wind justified by diurnal patterns; elevation benefits by airflow (Solanki et al., 2020).) Solar: Panels elevated 3 - 4 m, covering 2,827 m² per wind energy integration point (equivalent to a 60 m rotor area), 1,414 panels per point (0.283 MW). Wind: Integrated wind energy systems at 50 m, 100 m, and 150 m heights, with a 10% wind speed increase (factor 1.1) due to panel tilt. Configurations: - 2 integration points: 2 × 0.283 MW solar + wind energy (2,827 m² per point). - 3 integration points: 3 × 0.283 MW solar + wind energy (2,827 m² per point). Production: P_total = P_solar + P_wind, where P_wind = (1/2) × ρ × 2,827 × v³ × 0.4 × N (N = number of integration points, ρ = air density, v = wind speed adjusted by height: v_h = v_10 × (h/10)^0.2 × 1.1, α = 0.2).

The hybrid solar-wind system (Unit B) offers a transformative approach to renewable energy, surpassing photovoltaic-only systems in windy regions (Sinaí: 56.96 MWh/day/10 ha) and enabling agricultural land recovery. Global adoption could increase energy production by 7,304 GWh/day and crop yield by 9.5 million tons/year, revolutionizing energy and food systems. Future work includes a realistic model (December 2025) and a 10-hectare pilot by 2030.

Thanks to Uharte Town Hall and Ugazte Youth Department Project. We call global teens groups to replicate, contrast and improve our models in other scales bigger than 1 square meter wooden table. Computational support was provided by Grok 3 (xAI).