Alliant Energy EPRI: Electric Power Research Institute
Madison Solar Demonstration Project
Madison Solar Demonstration Project

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For information about Alliant Energy or this project, call 1-800-ALLIANT (1-800-255-4268). Please contact EPRI for website support.

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For website support or for information about EPRI or this project, call 1-650-855-2121, email or submit a form to contact EPRI's Customer Assistance Specialists.

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.

Help: information about this page...

View live data

Live data, if supported on this site, is updated every 15-30 seconds. For sites that do not support live data, a set of static time-delayed values will be shown.

View historical data

Charts throughout the site display historic data over time. Some charts are interactive and allow customization of date ranges and zooming in and panning of the plot area.

Site Overview

Overall Solar Performance
Overall Solar Snapshot

This panel shows recent power and energy values aggregated from all PV systems.

The gauge on the left shows solar power production at the time indicated.

The energy value on the right shows total energy generated over the project's lifetime.

The chart shows solar power production trends for the date range indicated.

Click 'MORE' to view system information and additional data.

Sampled Value (Gauge and Chart)

Power output (AC)

Cumulative Value

Cumulative energy generated

Power Output
Energy Generated
Power Output (kW)
Current Weather Conditions
Current Conditions

Shows on-site weather. Click on a weather icon to see more details.

Feels Like

Represents the temperature you actually feel by factoring in the heat index and wind chill.


Measures outdoor ambient air temperature.


Measures wind speed and direction.


Uses global horizontal irradiance to represent overall sunlight levels. Measured in watts per square meter (W/m²).


The rain gauge's 8-inch diameter bucket measures rainfall amount over the past 24 hours. It also collects and melts frozen precipitation (snow or ice) then measures the amount of water - a technique that is not precise.

Feels Like
° from N
Last 24h
Solar Generation Equivalents
Equivalents Defined
Equivalents represent solar energy generation as a relatable or abstract metric. Energy is converted to different metrics using conversion factors and assumptions, described below.
Carbon Dioxide (CO₂) Emissions

Estimated using annualized CO2 emitted by U.S. non-baseload electric power plants, avoided at a rate of 7.75x10-4 tons per kWh. Source: EPA, eGRID electricity reductions emission factor

Passenger Vehicles per Year

Number of vehicles is based on estimated CO2 emissions from U.S. light-duty vehicles (cars, pickups, SUVs) driven 11,300 miles per year and averaging 21.5 miles per gallon. The resulting conversion is approximately 149 vehicles per year for 1 GWh (1,000,000 kWh). Source: EPA, FHWA passenger vehicles per year

Stadiums Hosting 1 Pro Football Game

The number of pro-football games powered assumes a professional football stadium uses 50 MWh to host a game (10-MW electricity demand over a 5-hour period).

Acres of Forest per Year

Acres of forest are calculated using net CO2 absorption estimates from trees in "average" U.S. forests (tree growth minus harvesting and decomposition). Source: EPA, IPCC

Homes' Annual Electricity Use

Number of homes is based on annual electricity consumption of an average home in the U.S., including electric transmission and distribution grid losses. Source: EPA, EIA

Choose an icon
Use "?" for details

CO2 avoided
Annual CO2 emissions from passenger vehicles
Electricity to power stadiums for pro football games
Annual CO2 emissions absorbed by acres of forest
Annual electricity use from homes
Technology Tiles

Swipe or drag the row of tiles left and right or use the left/right "< >" arrows to see all available tiles.

Tap or click a tile to view more information and data.

Gauges show sampled measurements associated with each tile.

Aerial Map
Image Gallery
Time-Lapse Videos