EPRI | Alliant Energy - Madison Solar Demonstration Project

Madison Solar Demonstration Project

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About this website

This website was designed and developed by EPRI in collaboration with Alliant Energy, EPRI's Integration of Distributed Energy Resources and Solar programs, and EPRI's Power Delivery and Generation sectors.

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PV Array Orientations

The orientation lab includes multiple PV arrays arranged on a hillside with different orientations

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Fixed-Tilt Array: South 35°

This fixed position array is intended to maximize year-round sunlight exposure

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Fixed-Tilt Array: South 10°

A low-tilt PV array is more common on commercial roofs to minimize wind loading and prevent row shading

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Fixed-Tilt Array: Southwest 35°

Southwest facing PV array captures more afternoon sunlight

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Fixed-Tilt Array: Southeast 35°

Southeast facing PV array captures more morning sunlight

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Dual-Axis Tracking Array

Dual-axis tracking array actively tracks the sun by rotating and tilting throughout the day

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Single-Axis Tracking Array

Single-axis tracking array actively tracks the sun by tilting from east to west throughout the day; the array is horizontal at solar noon

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Total Sky Solar Radiation Station

Pyranometers measure direct and diffuse horizontal solar irradiation which are combined to measure total sky irradiance

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Weather Station

Instruments measure the constantly changing weather conditions

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Parking Lot Solar Canopies

Bird's-eye view of the solar canopies in the east parking lot

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Battery Energy Storage System

Energy storage in the form of batteries is used to capture and release energy as needed

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PV Module Materials

The rooftop PV arrays have various PV module technologies

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Polycrystalline Silicon (Poly 1)

Polycrystalline silicon PV modules within a PV array

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Polycrystalline Silicon (Poly 2)

Polycrystalline silicon PV modules within a PV array

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Polycrystalline Silicon (Poly 3)

Polycrystalline silicon PV modules within a PV array

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Monocrystalline Silicon (Mono)

Monocrystalline silicon PV modules within a PV array

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Thin Film: Cadmium Telluride (CdTe)

Thin film cadmium telluride (CdTe) PV modules within a PV array

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Thin Film: Copper Indium Gallium Selenide (CIGS 1)

Thin film copper indium gallium selenide (CIGS) PV modules within a PV array

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Thin Film: Copper Indium Gallium Selenide (CIGS 2)

Thin film copper indium gallium selenide (CIGS) PV modules within a PV array

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Multi-Layer Silicon: Hybrid

Hybrid PV modules within a PV array

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Reflective and Module-Optimized Array

Rooftop PV modules with reflective panels between rows

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Solar Trees: Architectural Structures

Architectural solar trees provide PV generation and unique design elements

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Group of Arrays: South 35° (Lift)

South facing solar tree intended to maximize year-round sun exposure

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Fixed-Tilt Array: East 35° (Lift)

East facing solar tree intended to capture more morning sunlight

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Fixed-Tilt Array: West 35° (Lift)

West facing solar tree intended to capture more afternoon sunlight

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Group of Arrays: Multi-Facing 5° (Trestle)

Solar tree with PV modules oriented at a 5° tilt

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Group of Arrays: Multi-Facing 10° (Trestle)

Solar tree with PV modules oriented at a 10° tilt

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Group of Arrays: South 32° (Curve)

Solar tree with PV modules oriented at a 32° tilt

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Group of Arrays: South 15° (Industry)

Solar tree with PV modules oriented at a 15° tilt

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Electric Vehicle Charging Stations

On-site car charging stations allow employees and the public to charge electric vehicles

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Overall Solar

Numerous solar arrays on-site with varying technologies and orientations

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Building Load

Alliant Energy office building

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Direct Normal Irradiance (Pyrheliometer)

The pyrheliometer follows the sun's path through the day to measure direct sunlight

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Diffuse Horizontal Irradiance (Shaded Pyranometer)

The pyranometer is shaded by a disk in order to measure indirect sunlight

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Global Horizontal Irradiance (Unshaded Pyranometer)

This pyranometer measures sunlight directly from the sun as well as reflected sources

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Global Tilted Irradiance: South 35° (Unshaded Pyranometer)

This pyranometer measures sunlight while oriented similarly to the PV arrays

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PV Array: West Parking Lot

Solar canopies with PV arrays cover several car parking spaces in the west parking lot

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Apparent Temperature (Feels Like)

Apparent temperature or "feels like" temperature

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Outdoor Air

Temperature and relative humidity instruments within a solar shield

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Wind

Ultrasonic wind instrument that measures wind speed and direction

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Precipitation

Precipitation instrument that measures both rain and snow melt

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About this website

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