⚛️ Illinois Energy Profile #1 Nuclear State (11 reactors) CEJA 2021 — 100% Clean 2050
#1 US nuclear state
~10 GW installed
(peaking)
from 46% in 2010)
11 reactors, 6 plants
CEJA 2021 goal
Illinois Electricity Mix (2023)
Generation Trend (%, 2010–2023)
Net Exporter of Clean Electricity
Illinois generates more electricity than it consumes — exporting clean nuclear and wind power to neighboring states via the PJM Interconnection. This makes Illinois a critical node in the Midwest clean electricity network. Chicago's ComEd territory is one of the largest single-utility service areas in the US (4 million customers).
Illinois Nuclear Plants — Capacity (MW)
Nuclear Share of Illinois Electricity (%)
Illinois Nuclear Fleet
| Plant | Reactors | Capacity | Operator | License Expiry |
|---|---|---|---|---|
| Braidwood | 2 PWR | 2,386 MW | Constellation | 2026/2027 (renewal pending) |
| Byron | 2 PWR | 2,347 MW | Constellation | 2024/2026 (CEJA extended) |
| Dresden | 2 BWR | 1,845 MW | Constellation | 2029/2031 |
| LaSalle | 2 BWR | 2,320 MW | Constellation | 2022/2023 (renewal approved) |
| Quad Cities | 2 BWR | 1,870 MW | Constellation | 2032 |
| Clinton | 1 BWR | 1,069 MW | Constellation | 2026 (CEJA supported) |
Near-retirement crisis (2021): Before CEJA passed, Constellation (then Exelon) threatened to close Byron and Dresden nuclear plants in 2021, citing negative wholesale electricity prices (driven by cheap wind). CEJA's zero-emission credit program provided ~$700M/yr in ratepayer support, keeping these plants open through at least 2030.
Wind Capacity (GW, cumulative)
Solar Additions (MW per year)
CEJA Wind & Solar Buildout
CEJA mandates Illinois reach 40% renewable electricity by 2030 and 50% by 2040. Illinois has strong wind resources in the north (especially near the Iowa border) and is seeing rapid solar growth. CEJA created the Illinois Solar for All program and the Adjustable Block Program, which has been significantly oversubscribed — indicating strong market demand.
Illinois wind challenge: Unlike Texas or the Great Plains, Illinois is a more contested landscape — corn and soybean country where wind turbine setbacks, noise, and property value concerns have led to county-by-county moratoriums. CEJA included preemption provisions allowing wind projects to override local bans under certain conditions.
Climate and Equitable Jobs Act (CEJA) 2021
Illinois Governor JB Pritzker signed CEJA in September 2021 — a landmark $45 billion 10-year clean energy package. It is considered one of the most comprehensive state climate laws in US history, notable for its explicit focus on environmental justice, labor standards, and economic equity alongside decarbonization.
| Provision | Target / Amount |
|---|---|
| 40% renewables by 2030 | ~11 GW additional wind + solar needed |
| 50% renewables by 2040 | Requires continued aggressive buildout |
| 100% carbon-free by 2050 | All sources including nuclear |
| Coal plant closures | All coal by 2035 (with exceptions) |
| Zero-emission credits | ~$700M/yr to sustain nuclear plants |
| Equity provisions | 25% of new clean energy in EJ communities |
| Clean energy workforce | $180M in training programs |
| EV charging | $100M in Charge Illinois program |
Exelon / Constellation / ComEd — The Illinois Energy Complex
The Illinois energy landscape is dominated by two closely related companies that were spun apart in 2022:
| Entity | Role | Key Facts |
|---|---|---|
| Exelon | Utility holding company (post-2022 split) | Owns ComEd (IL) + BGE, Pepco, PECO, Delmarva utilities. ~10M electric customers total |
| ComEd | IL electric distribution utility | 4M customers in northern IL; Chicago and suburbs; regulated by ICC |
| Constellation Energy | Nuclear + clean generation | Owns all 6 IL nuclear plants (formerly Exelon Generation); 21 GW nuclear fleet nationally |
PJM Interconnection: Illinois is part of PJM (Pennsylvania-New Jersey-Maryland) Interconnection — the world's largest competitive wholesale electricity market. PJM coordinates power for 65 million people across 13 states. Illinois nuclear plants often set price in PJM markets during low-demand periods, driving negative power prices — which paradoxically threatened their economic survival until CEJA's zero-emission credits.
ComEd corruption scandal: In 2021–22, ComEd admitted to bribing Illinois House Speaker Michael Madigan with lobbying contracts to secure favorable legislation. ComEd paid a $200M deferred prosecution settlement. This has increased regulatory scrutiny of all Illinois utility legislation.
Economic Profile
| Metric | Value | Notes |
|---|---|---|
| GDP | ~$1.05 trillion | 5th largest US state economy; Chicago hub |
| Nuclear economic impact | ~$8B/yr | Power sales + 28,000 high-wage jobs (Constellation estimate) |
| Clean energy jobs | ~120,000 | Including nuclear, wind, solar, efficiency |
| Wind energy investment | ~$15B cumulative | Through 2023; mostly northern IL |
| Electricity cost | ~13 c/kWh residential | Above US avg; distribution costs high in Chicago |
| CME Group | World's largest derivatives exchange | Energy commodity futures (WTI, Henry Hub) priced here |