Company Overview

Alliant Energy Corporation is a regulated public utility holding company that provides electricity and natural gas services in the United States. The company operates primarily in the electric utilities and natural gas distribution industries, generating the vast majority of its revenue from regulated utility operations. Its core business is the generation, distribution, and sale of electricity and the distribution and transportation of natural gas to residential, commercial, industrial, and agricultural customers.

The company’s primary revenue drivers are its regulated electric and gas utility subsidiaries, which earn returns based on approved rate structures set by state regulatory commissions. Alliant Energy’s customer base is predominantly residential and commercial, with additional exposure to industrial and agricultural users in the Midwest. A key strategic advantage is its fully regulated business model, which provides relatively stable cash flows and earnings visibility. Alliant Energy traces its roots to several Midwestern utility companies formed in the early 20th century and was established in its current corporate structure in 1999 through the merger of Interstate Power Company and Wisconsin Power & Light.

Business Operations

Alliant Energy conducts its operations through two principal regulated utility subsidiaries: Interstate Power and Light Company (IPL) and Wisconsin Power and Light Company (WPL), which operates under the trade name Alliant Energy. These subsidiaries collectively provide electric service to approximately one million customers and natural gas service to over 400,000 customers. Revenue is primarily generated through the sale of electricity and natural gas under state-regulated tariffs.

The company owns and operates a portfolio of generation assets that includes natural gas-fired power plants, coal-fired facilities, and renewable energy assets such as wind and solar. Alliant Energy has been actively reducing coal capacity while expanding renewable generation. Operations are almost entirely domestic, with no material international utility operations. The company does not rely heavily on joint ventures for core operations, instead maintaining direct ownership of its regulated assets.

Strategic Position & Investments

Alliant Energy’s strategic direction centers on regulated rate base growth, grid modernization, and the transition to cleaner energy. The company has committed to long-term capital investment plans focused on renewable energy expansion, particularly utility-scale wind and solar projects, and the retirement of older coal-fired plants. These initiatives are designed to support earnings growth while aligning with state-level clean energy policies.

Major investments include ongoing construction of renewable generation facilities and upgrades to electric transmission and distribution infrastructure. Alliant Energy has also invested in battery storage and advanced grid technologies to improve reliability and efficiency. While the company does not operate a broad portfolio of non-utility subsidiaries, it maintains smaller energy-related entities that support renewable development and energy services within its regulated framework.

Geographic Footprint

Alliant Energy’s operations are concentrated in the Midwestern United States, with its primary service territories located in Iowa and Wisconsin. The company is headquartered in Madison, Wisconsin, and its utility subsidiaries operate under the regulatory oversight of state public utility commissions in these two states.

The company does not have significant operational presence outside the United States. Its geographic focus allows for deep regulatory relationships and localized infrastructure investment, but also means its performance is closely tied to economic and demographic trends within the Midwest.

Leadership & Governance

Alliant Energy is led by an executive team with extensive experience in regulated utilities, capital-intensive infrastructure management, and energy transition strategy. The leadership emphasizes financial discipline, regulatory engagement, and long-term sustainability as core elements of the company’s strategic vision.

Key executives include:

• Lisa M. Barton – President and Chief Executive Officer
• Robert J. Durian – Executive Vice President and Chief Financial Officer
• Wayne A. Reschke – Executive Vice President, Operations
• Katherine H. Koelker – Senior Vice President, Corporate Strategy and Sustainability
• John O. Larsen – Senior Vice President, Generation

The board of directors provides governance oversight with a focus on risk management, regulatory compliance, and capital allocation aligned with shareholder and customer interests.