Standard Solar has agreed to buy 43.3 MW of community solar in Illinois from Trajectory Energy Partners. That figure would describe one mid-sized solar farm almost anywhere else in the United States. Here it describes thirteen of them, scattered across five counties and two wholesale electricity markets. The number worth understanding is not 43.3. It is 13.
Key takeaways
- Standard Solar, a Brookfield portfolio company, has acquired the 43.3 MW Tallgrass community solar portfolio in Illinois from developer Trajectory Energy Partners, announced on 27 October 2026 with no disclosed consideration.
- The portfolio comprises 13 separate community solar projects sited across both the MISO and PJM power markets in Illinois, with commercial operations beginning in phases in 2027 and continuing into 2028.
- Nine of the thirteen projects carry stated capacities between 2 MW and 4 MW, totalling 22 MW, led by the 4 MW Blue Aster project in Winnebago County and including the 2 MW Barn Owl project in Cook County.
- Enerdatics records 1,723 community solar projects in Illinois with a combined capacity of 5,837 MW, an average of 3.4 MW each, against a Tallgrass average of 3.3 MW across its thirteen sites.
- Trajectory Energy Partners developed the portfolio and Standard Solar will carry out construction and commissioning, with output sold to Illinois residents and businesses under community solar power purchase agreements.
Why does 43 MW of Illinois solar arrive as thirteen projects?
Because community solar is sized by the system it connects to and the customers it serves, not by the ambitions of the developer. A community solar project sells its output to local subscribers who receive credits on their utility bills rather than to a single corporate or utility offtaker, and it connects to the distribution network that already runs past the site. Distribution feeders have modest headroom. Subscriber pools are local. Both constraints point to the same answer, which is a project of a few megawatts rather than a few hundred.
The Tallgrass sites follow that logic exactly. Red Bird West, Red Bird East, Stovepipe West and Stovepipe East sit together in Logan County. H and R North is in Perry County, Prairie North in Boone, Blue Aster and Fox Sparrow in Winnebago, Barn Owl in Cook. Hawk Haven, Grannys Creek North, Grannys Creek South and Lanceleaf are identified by the towns of Loves Park, Du Quoin and Marengo rather than by a stated capacity, and between them they account for the 21.3 MW the named nine do not cover.
Set the portfolio average against the market and the shape stops looking like a quirk of this transaction. The thirteen Tallgrass projects average 3.3 MW. Every community solar project Enerdatics tracks in Illinois averages 3.4 MW. Standard Solar has not bought an unusually fragmented portfolio. It has bought a portfolio shaped like the entire Illinois fleet.
What does a buyer take on when it buys thirteen projects instead of one?
Thirteen of everything. Each project needs its own interconnection agreement, its own site control, its own permits, its own construction mobilisation and its own commissioning. None of that work scales down with capacity. A 2 MW project in Cook County requires a crew, a utility coordination process and a set of inspections that are not materially cheaper than those for a 4 MW project in Winnebago County, which is why cost per MW rises as project size falls in this part of the market.
The split across two wholesale markets adds a second layer. MISO and PJM are separate regional transmission organisations with separate interconnection procedures, and Illinois is one of the few states divided between them. Northern Illinois, including Cook and Winnebago counties, sits in PJM territory. Much of the rest of the state sits in MISO. A portfolio that straddles the line is administering two processes rather than one, and that is before the distribution utility requirements that apply to each individual connection.
This is the work Standard Solar is taking over. Trajectory developed the sites to ready-to-build status, meaning permits, land rights and grid connection are in place and construction can begin. What remains is delivery, thirteen times, on a schedule that runs into 2028. That division of labour is familiar: the company bought a 6.3 MW community solar project in Channahon, Illinois, from Calvert Energy in November 2025 on the same basis.
What makes Standard Solar the buyer for a ready-to-build portfolio?
Equipment it already owns and a balance sheet that can hold the assets afterwards. Developers reaching ready-to-build have spent years and comparatively little capital to get there, and the next phase demands the opposite. Standard Solar has been assembling the inputs for that phase for two years, including the 512 MW of safe harboured solar panels Enerdatics reported in March 2026, bought early enough to fix a tax credit vintage for projects that had not yet begun construction.
Trajectory, for its part, is doing what it has done repeatedly. Enerdatics records five Trajectory Energy Partners divestments, none of them carrying a disclosed value, and three of those fall since the start of 2024: an 18.6 MW community solar portfolio sold to Summit Ridge Energy and a 7 MW portfolio sold to Nexamp, both in 2024, and now Tallgrass. At 43.3 MW this is the largest of the three, though not the largest on file, which remains a 157 MW development portfolio sold to Sol Systems in April 2023.
Enerdatics records 35 solar transactions touching Illinois since the start of 2024, and not one of them carries a disclosed value. Standard Solar is the buyer in seven. No other company appears more than twice. In a market where the clearing price is invisible, the observable fact is who keeps transacting, and in Illinois community solar the answer has been the same name for two years.
What does the deal signal for US community solar?
That the asset class has settled into a standing trade with two sides and a stable handover point. Developers originate, permit and connect. Owners build, commission and hold. The transfer happens at ready-to-build, and it happens often enough that both sides have specialised: Trajectory has sold five times without ever revealing a price, and Standard Solar has bought at least seven times in a single state.
The pricing consequence is that none of it is observable from outside. Thirty-five Illinois transactions and no disclosed value means buyers are underwriting against their own cost stacks and their own equipment positions, not against comparables. The same opacity showed up in Washington state, where none of the five solar transactions Enerdatics records since 2024 carries a price. What gets competed for in these deals is not the asset at a number. It is the ability to finish thirteen projects on the dates the subscribers were promised.
Frequently asked questions
How large are the individual projects in the Tallgrass portfolio?Nine of the thirteen have stated capacities between 2 MW and 4 MW, adding to 22 MW, with the remaining four accounting for 21.3 MW. The portfolio average is 3.3 MW per project, close to the 3.4 MW average across all 1,723 Illinois community solar projects Enerdatics tracks.
Was a price disclosed for the transaction?No. Enerdatics records no disclosed value for this deal, which matches the wider state market: none of the 35 Illinois solar transactions logged since the start of 2024 carries a disclosed value.
When will the projects start operating?Commercial operations are expected to begin in phases from 2027 and continue into 2028. Standard Solar is responsible for construction and commissioning, having acquired the portfolio at ready-to-build stage from Trajectory Energy Partners.
Enerdatics tracks community solar M&A across every US state, including the 35 Illinois solar transactions since 2024 and the buyers that keep returning to them. Explore Enerdatics for the full comparables set behind this analysis.
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