Alliant Energy Corporate Services, Inc. 401(k) Plan: Login, Facts & Contact Information
Alliant Energy Corporate Services, Inc. 401(k) Login
1,139 former Alliant Energy Corporate Services, Inc. employees still have money in this plan.
Retirement plan providers can change. This information is from the plan's 2024 filing.
Alliant Energy Corporate Services, Inc. 401(k) Plan Facts
Source: Form 5500 for plan year 2024 (Jan 1, 2024 – Dec 31, 2024), filed Oct 15, 2025. Public filing with the U.S. Department of Labor.
Money in and out in plan year 2024
- $81.6 million went into the plan in contributions, $31.1 million of it from the employer (38%).
- $191.6 million was paid out to participants.
- Investment and other income added $198.6 million.
- Administrative expenses were $922,730, about $219 per account.
How the Alliant Energy Corporate Services, Inc. 401(k) changed, 2019–2024
| Plan year | Participants | Plan assets | Employer contributions | Benefits paid |
|---|---|---|---|---|
| 2019 | 4,900 | $1.24 billion | $25.6 million | $112.4 million |
| 2020 | 4,716 | $1.39 billion | $25.6 million | $113.2 million |
| 2021 | 4,586 | $1.51 billion | $26.3 million | $137.7 million |
| 2022 | 4,522 | $1.17 billion | $27.6 million | $149.6 million |
| 2023 | 4,392 | $1.32 billion | $29.0 million | $119.0 million |
| 2024 | 4,517 | $1.41 billion | $31.1 million | $191.6 million |
Alliant Energy Corporate Services, Inc. 401(k) Contact Information
Questions about the Alliant Energy Corporate Services, Inc. 401(k)
Does Alliant Energy Corporate Services, Inc contribute to the 401(k)?
Yes. The plan reports an employer contribution arrangement. In plan year 2024 the employer contributed $31.1 million, 38% of all contributions.
Does the Alliant Energy Corporate Services, Inc 401(k) have automatic enrollment?
Yes. The plan reports automatic enrollment of eligible employees.
How many people are in the Alliant Energy Corporate Services, Inc 401(k) plan?
4,517 participants at the start of plan year 2024, 2,987 of them active employees, and 1,139 former employees who still had money in the plan.
What is the average 401(k) balance at Alliant Energy Corporate Services, Inc?
About $334,128 per account: $1.41 billion in plan assets across 4,217 accounts with a balance at the end of plan year 2024.
Who manages the Alliant Energy Corporate Services, Inc 401(k) accounts?
Empower (listed on the filing as EMPOWER ANNUITY INS CO OF AMERICA) is the plan's recordkeeper, which is where participants log in to see their balance.
I no longer work at Alliant Energy Corporate Services, Inc. How do I access my 401(k)?
Your account stays with Empower after you leave, so you can log in with the same credentials. If your balance was small, the plan may have rolled it into an IRA in your name. If you can't find it, Beagle can locate it for you.