Solar · Analysis

The little arrays that added up: co-op solar, Wisconsin style

Dairyland Power's member cooperatives built roughly 1 to 2.5 megawatt solar arrays for years before the big utilities moved. Here is the ledger of what got built, and what it taught.

By the Clean Energy Wisconsin editors · Filed October 13, 2026 · 6 min read

How the little arrays got built

Most of these projects were not owned by the co-op outright. They were built under a power purchase agreement (a contract where a developer owns and operates the array and the co-op simply buys the electricity it produces, usually at a fixed price for a set number of years). Dairyland signed with an outside solar developer, and the arrays went up on parcels near existing substations, each one on the order of 1 to 2.5 megawatts.

Small size was deliberate, not timid. An array that plugs into a distribution line (the lower voltage wires that run down your road) instead of the high voltage transmission grid is cheaper to connect and faster to permit, and a megawatt or two is about what one rural substation can comfortably take. Build a dozen of those near the load, and you have spread the risk without betting the whole cooperative on a single giant project.

The honest ledger

Add the sites together and you land on the order of 15 to 20 megawatts across roughly a dozen locations, at last public report. That is small. One of the newer utility scale farms downstate, Badger Hollow in Iowa County, is on the order of 300 megawatts by itself, more than ten times the whole Dairyland set. Nobody at a co-op pretends otherwise.

Winter output math is sobering too. A Wisconsin panel spends part of the season under snow and short, low angle daylight, so these arrays run at a capacity factor (the share of their maximum output they actually deliver over a year) of roughly 15 to 18 percent, lower than a plant in Arizona. What they buy is not cheap bulk power. It is price certainty, local generation, and a hedge the cooperative controls.

What the co-ops learned

First came a plain but valuable lesson: siting beats everything. Flat parcels the co-op or a member already owned, close to a substation with capacity left on it, made projects pencil out; scattered or distant land did not. A second lesson was about snow. Panels tilted steeper shed it faster, and some sites added bifacial panels (double sided modules that also catch light bouncing off snow) to claw back a little winter output.

The quiet result is that when the big utilities finally moved, they were not starting cold. Madison Gas and Electric and We Energies backed large farms like Badger Hollow, and the MISO grid operator (the Midcontinent Independent System Operator, which runs the regional power market and the interconnection queue across much of the Midwest) now has a long line of Wisconsin solar waiting to connect. The little co-op arrays were the proof of concept the state got to watch for a decade first.

Worth watching this month

1. Dairyland Power's board and member co-ops publish updated resource plans periodically, so watch the cooperative's own site for any new solar or storage additions beyond the original arrays.

2. The Public Service Commission of Wisconsin posts large project dockets on its electronic records system, where any new utility scale solar filing shows up first and is public to read.

3. MISO's generator interconnection queue lists Wisconsin solar projects by county, a routine but revealing look at what developers are proposing next.

4. Focus on Energy, the statewide efficiency and renewable program, opens and closes incentive offerings on its own schedule, worth checking if you are weighing your own panels.

5. Watch the U.S. Energy Information Administration's Wisconsin state electricity profile, updated a few times a year, the simplest public scorecard for how much of the state's power is now solar.

Common questions

Did these co-op arrays make my bill go up or down?

Honestly, neither by much on their own. A megawatt or two of solar is a small slice of a cooperative's total supply, so the effect on any one monthly bill is modest. The larger value is price stability over the length of the contract.

Can I buy into a community solar array through my co-op?

It depends entirely on your co-op. Some member cooperatives offer a community solar subscription where you pay for a share of an array's output; others do not. Call your local cooperative and ask what is open.

Why are these so much smaller than the new solar farms?

They connect to local distribution lines rather than the high voltage transmission grid, which caps their practical size at a megawatt or two per site. The big farms connect to transmission and can run into the hundreds of megawatts.

Does Wisconsin snow make solar pointless?

No, it just lowers winter output. Panels still produce on cold clear days, and snow usually slides off tilted modules within a day or two. The annual total matters far more than any single snowy week.

Sources of record

Dairyland Power Cooperative (wholesale supplier)The generation and transmission cooperative's own pages on its solar and renewable projects and member co-ops. (www.dairylandpower.com).
MISO, the regional grid operatorMarket and generator interconnection queue data for Wisconsin and the wider Midwest grid. (www.misoenergy.org).
Public Service Commission of Wisconsin (.gov)State regulator; its electronic records filing system lists utility solar project dockets you can read. (psc.wi.gov).
U.S. Energy Information Administration, Wisconsin profile (.gov)Federal electricity data; the state profile shows Wisconsin's generation mix, including solar. (www.eia.gov/state/?sid=WI).
Focus on Energy (statewide program)Wisconsin's statewide energy efficiency and renewable incentive program for homes and businesses. (focusonenergy.com).

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