Categories - Renewable Energy
Sub Categories
- Hydro Energy - 14 projects
- Bioenergy - 6 projects
- Wind Energy - 46 projects
- Geothermal Energy - 12 projects
- Photovoltaics and Solar Energy - 69 projects
Topics
solar-cells, geothermal, wave-energy, wind-turbines, pvoutput, rotorcraft, aircraft, aerodynamics, seabirds, offshore-wind, migratoryspecies, collision-risk, process-simulation, sunsynk, inverter, deye, potential-flow, offshore-wind-platforms, openmdao, fault-detection, optics, raytracing, marine-renewable-energy, amrex, ecp, exascale-computing, boundary-element-method, aeroelasticity, wind-power, scada, balkonkraftwerk, modelica-library, bifacial, openfoam, geothermal-energy, hoymiles, cloud-motion-prediction, generative-models, photovoltaic-power, probabilistic-solar-forecasting, sky-images, stochastic-video-prediction, degradation, duramat, photovoltaic-systems, pv-modules, photovoltaic-panels, mhkit, operations-maintenance, simpy, scr-2609, snl-visualization, dweet, freeboard, modbus-sungrow, model-detection, sungrow-inverter, keras, solenso, tsun, hut23-425, scr-1551, multiphysics, aeronautics, structural-dynamics, structures, exawind, les, low-mach, defects, electronic-structure, finite-difference-time-domain, energy2d, unsupervised-machine-learning, yolo3, materials-design, semiconductors, hydropower-model, photovoltaics-dashboard, custom-cards, water-wave, detector-model, equation-of-state, heat-capacity, molecule, solubility, surface-tension, thermal-conductivity, vapor-pressure, wind-farm, viscosity, aeroacoustics, vortex-methods, vpm, shading-effects, pv-simulator, chakra-ui, reuse, repair, vtol, compliance, low-carbon-systems, circularity, circularity-metrics, lifetime, mass-flow, detection-boxes, scr-2927, non-governmental-organization, wec-sim, beam-irradiance, flight-simulation, sun-position, crne-solar, simulink, scr-1647, outback-mate, packets, renogy, renogy-rover, slack, heatexchanger, solax, perovskite-solar-cells, slack-bot, solarthing, solcast, cheminformatics, halide-ion-migration, density, huawei-solar, modbus-rtu, modbus-tcp, boundary-element, hydrodynamic-coefficients-viewer, mesh-processing, meshviewer, sofar, sol-ark, solarman, solis, biochemical-process, bioprocess, biorefinery, centrifuge, distillation, fermentation, flash, heat-exchanger, unit-operation, balkonpv, ecosystem-models, phenotyping, geothermal-reservoirs, golem, radiance, scr-2490, actuator-line, airfoils, blade-element, turbines, solar-concentrating-systems, borehole-image-analysis, fracture, fracture-mechanics, fractures, mplstereonet, structural-geology, carbon-sequestration, coupled-heat-mass, multiphase-transport, nuclear-waste-repositories, porous-flow, reactive-chemistry, simulation-modeling, soil-vapor, subsurface-hydrology, subsurface-remediation, home-assistant-integration, huawei, naval-architecture, plate-thickness, plates, structural-engineering, agroclimatology, agroclimatology-data, nasa-power, weather-variables, semiconductor, amr, ocean-wave-energy-converters, potential-flow-theory, wave-structure-interaction, deeplabv3, deepsolar, inception-v3, network-planning, neurips-2020, pv-systems, solar-panels, bioreactor, inverse-modelling, meshing, borefields, sizing, moose-framework, irradiance, ninja, bem, bemt, propeller, rotor, systems-engineering, wisdem, ray-tracing, rigorous-coupled-wave, transfer-matrix-method, ste, analysis-framework, beam-section, buckling, cylinders, design-of-offshore-steel-structures, dnv-os-c101, dnvgl-os-c101, dnvgl-rp-c201, dnvgl-rp-c203, fatigue-analysis, girder, gui-based,
Projects
Contributors
Patrick Mulrooney [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics:
agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait
Jimmy Chen [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics:
agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait
robbenyang [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics:
agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait
MarvinJ [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics:
agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait
udaysaraf [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics:
agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait
Chris Black [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics:
agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait, visualisation, commonmark, converter and 6 more
Raymond Hickey [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
photovoltaic, solar
Chetan Chaudhari [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
photovoltaic, solar
Rowan Molony [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
buildings, dublin, geopandas, heatmap
Mark Mikofski [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
photovoltaic, solar, anaconda, anaconda-distribution, ide, language-server-protocol, qt, spyder, winpython, units
akeeste [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
dforbush2 [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
Michael Lawson [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
Bradley A. Ling [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
jleonqu [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
j-vanrij [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
Lily Nguyen [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
crobarcro [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, julialang, numerical, programming-language, scr-1647
emiliofa [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
sedwardsand [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
Aquaharmonics [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
zmorrell-sand [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, wdrt, scr-1647
yuyihsiang [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
mattEhall [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
NREL-Jim-McNally [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647
Patrick Duffy [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
Rupert Brandstaetter [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics:
biochemical-process, bioprocess, biorefinery, centrifuge, chemical-engineering, distillation, fermentation, flash, heat-exchanger, life-cycle-assessment and 8 more
Sunghyun Kim [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
defects, electronic-structure, materials-design, semiconductors, solar-cells, computational-chemistry, materials-science
sam [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
defects, electronic-structure, materials-design, semiconductors, solar-cells
Miguel Rivera [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
defects, electronic-structure, materials-design, semiconductors, solar-cells
Alex Ganose [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
defects, electronic-structure, materials-design, semiconductors, solar-cells, computational-chemistry, materials-science, semiconductor-physics, solar-fuel, spectroscopy and 6 more
Anders Goude [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
actuator-line, airfoils, blade-element, openfoam, turbines, wind-energy
daa-mec [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
actuator-line, airfoils, blade-element, openfoam, turbines, wind-energy
Martin Wosnik [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
actuator-line, airfoils, blade-element, openfoam, turbines, wind-energy
Lucy Whalley [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
defects, electronic-structure, materials-design, semiconductors, solar-cells, heat-diffusion, hot-carrier, perovskites, polarons, semiconductor-physics
Luc Berger-Vergiat [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy, sandia-national-laboratories, snl-science-libs, abstraction and 4 more
Johnathan Vo [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy, build, exawind-builder, sandia-national-laboratories and 1 more
ddement [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy, build-system, spack
Jeremy Melvin [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy, snl-applications, turbulence
Chris Luchini [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy, sandia-national-laboratories, snl-science-libs
Robert Wilson [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy
ichi [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy, sandia-national-laboratories, snl-science-libs
Justin Lamb [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy, snl-applications, turbulence
Bernhard Kirchen [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
balkonkraftwerk, esp32, hoymiles, platformio, solar, solenso, tsun
Stephen Kennon [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy, snl-applications, turbulence, sandia-national-laboratories and 1 more
Tim Neumann [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy
Andrey Prokopenko [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy, sandia-national-laboratories, snl-science-libs, computational-physics and 17 more
Thomas Lund [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy
stumpjumper [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy, snl-applications, turbulence
kflemin [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
district-cooling, district-heating, geojson, microgrid, modelica, modelica-library, urban-analytics, urban-planning
davidvhill [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
eros, lcmap, mesos, see, usgs
Abiodun Olaoye [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
wind-energy, wind-energy-analytics, wind-turbine
Jason Fields [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
suitability, turbine, wind
Ryan Barrett [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
aircraft-design, aircraft-performance, flapping-flight, flight-vehicle-aerodynamics, low-speed-aerodynamics, potential-flow, steady-state, unsteady-flows, vortex-lattice, wind-turbines
Christoph Rackwitz [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
opencv
Sondre Sortland [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
eclipse, opm, reservoir, segy, seismic, hactoberfestivus
Ceesjan Luiten [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
alerting, graphing, alertmanager, deduplication, notifications, opsgenie, pagerduty, slack, apps, templates and 1 more
r-molins-mrp [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
Pedro Reguera Rodriguez [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Mike Wagner [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Stefan Oberhumer [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
balkonkraftwerk, esp32, hoymiles, platformio, solar, solenso, tsun
xsider [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Grzegorz Araminowicz [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Krzysztof Nowak [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
azeemshatp [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Daniel Fanache [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Rhushabh [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Todd Karin [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Mike Wagner [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Abbaad Haider [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Will Hardy [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
JacquotLeHaricot [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
alignment, flexible
Tansy Arron [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Will McNaughton [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Andrew Benedict Wallace [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
seanth [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
raghu1121 [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
mrnaz [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Ben Robinson [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
Nikolaj Kappler [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
balkonkraftwerk, esp32, hoymiles, platformio, solar, solenso, tsun
Ivanov [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
marine-renewable-energy, mhkit, quality-control
Marc-Philip [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
balkonkraftwerk, esp32, hoymiles, platformio, solar, solenso, tsun
Michael Wilk [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
balkonkraftwerk, esp32, hoymiles, platformio, solar, solenso, tsun
Luca Kröger [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
balkonkraftwerk, esp32, hoymiles, platformio, solar, solenso, tsun
jstammi [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
balkonkraftwerk, esp32, hoymiles, platformio, solar, solenso, tsun
matteodefelice [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
energy-system, hydropower, power-system-simulation
Gibson Kersting [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
Timo Schindler [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
balkonkraftwerk, esp32, hoymiles, platformio, solar, solenso, tsun
gbarter [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
Sebastian Gatscha [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
graph-functions, network-graph, property-graph, daterangepicker, shiny, geospatial-visualization, web-mapping
nmstreethran [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
renewable-energy, wind-turbines, agriculture, climate-change, ireland, renewable energy, drought, coding, latex, notes and 10 more
vnshanmukh [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
nowcasting, pvoutput, solar
Aron Walsh [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
defects, electronic-structure, materials-design, semiconductors, solar-cells, materials, monte-carlo, photovoltaic, physics, semiconductor and 30 more
Julian Quick [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
Carlos A Michelen Strofer [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:
hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, wdrt, scr-1647
rking [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
root [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
aeroelasticity, aeronautics, structural-dynamics, structures, wind-turbines
Nate Roberts [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy, snl-applications, turbulence, sandia-national-laboratories and 1 more
Christian Trott [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:
cfd, ecp, exascale-computing, exawind, les, low-mach, wind-energy, kokkos, cpp14, geometry and 23 more
Andrew Godbehere [email protected]
OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:
anaconda, estimator, model-selection, visual-analysis, visualizer, photovoltaic, renewable-energy, renewables, solar-energy