EEI ESG/Sustainability Qualitative

About Alliant Energy

Alliant Energy Corporation (NYSE: LNT) is a Midwest U.S. energy company with annual operating revenues of more than $3 billion. Our company is primarily engaged in electric generation and the distribution of electricity and natural gas. We serve approximately 960,000 electric and 410,000 natural gas customers through our two public utility subsidiaries, Interstate Power and Light (IPL) and Wisconsin Power and Light (WPL). IPL provides retail electric and gas service in Iowa, and WPL provides retail and wholesale electric and retail gas service in Wisconsin. IPL also sells electricity to wholesale customers in Minnesota, Illinois and Iowa. Headquartered in Madison, Wisconsin, Alliant Energy has approximately 4,000 employees and more than 26,000 shareowners of record. Based on electric sales, the largest cities served in Iowa and Wisconsin are Cedar Rapids and Beloit, respectively.

T E M P L A T E

1 Alliant Energy EEI ESG/Sustainability Qualitative T E M P L A T E

ESG/Sustainability GovernanceWe engage in sustainability at all levels and in all departments of the company because of its importance to our company, our values and our strategy. Our system of governance helps us most effectively integrate sustainability throughout the organization.

Board of Directors

Responsible for overseeing our vision and mission, strategic plan and overall corporate risk profile – including the impact climate and carbon risks and environmental policy have on these matters

Consists of experienced and diverse members Consists of independent directors other than the Chief Executive Officer

Operations Committee of the Board of Directors

Responsible for overseeing environmental strategy and policy, including climate and carbon issues

Reviews and approves the Corporate Sustainability Report Consists solely of independent directors

Environmental Services and Corporate Sustainability Department

Responsible for coordinating company sustainability initiatives and reporting Reports to Senior Vice President of Utility Operations

Sustainability Leadership Team

Responsible for aligning and advancing sustainability throughout the company Provides guidance and direction on meaningful sustainability goals, fosters

cross-functional collaboration, identifies and evaluates strategic sustainability opportunities, empowers innovative and creative ideas to drive sustainability, champions our sustainability priorities to enable integration throughout the company

Consists of decision-makers from throughout all departments in the company

E S G / S u s t a i n a b i l i t y S t r a t e g y

Our sustainability pillarsSustainability means doing the right thing, with an eye toward the long run. Our sustainability strategy looks into the future, promoting responsible company growth through the economic, social and environmental decisions we make today. Because it touches on all six of our Values, sustainability factors into every one of those major decisions.

That’s why sustainability is built into how we provide energy. Our long-term strategic plan includes carbon reductions and the expansion of renewable energy. But we also recognize that our company’s growth depends on the support of strong, thriving communities in which we serve. And we know that investing in the personal development and well-being of our employees brings value many times over.

Achieving balance has always been integral to our company’s operations. Our energy vision and strategy embraces four guiding principles that are grounded in sustainability:

Implementing innovative customer solutions

Advancing clean energy

Building a smarter, stronger power grid

Strengthening our communities

All of these sustainable principles are part of “powering beyond,” which will transform, grow and optimize our business well into the future. Optimize

Sustainable energy

Transform Grow

ECONOMIC

ENVIRONMENT

SOCIAL

2 Alliant Energy EEI ESG/Sustainability Qualitative T E M P L A T E

Sustainability Plans and ProgressLocated in the Midwest, our customers reside in mid-size cities, smaller towns or villages, and rural areas. Our strategic plan aims to expand the portfolio of cleaner and renewable resources while accelerating energy growth to help minimize individual customer prices. We are also modernizing the power grid and gas distribution system to enhance safety, reliability and be more price-competitive and market-responsive for customers.

Coal Coal Coal

Natural gas

Natural gas

Naturalgas

Nuclear NuclearOil OilOil

Renewables RenewablesRenewables

2005 20242017

Transitioning our energy resources*

*Based on approximate capacity in megawatts As of August 2018

44% 37%

5%9%

5%

33%

6%

44% 23%

33%

43%

16%

1%1%

Coal Coal Coal

Natural gas

Natural gas

Naturalgas

Nuclear NuclearOil OilOil

Renewables RenewablesRenewables

2005 20242017

Transitioning our energy resources*

*Based on approximate capacity in megawatts As of August 2018

44% 37%

5%9%

5%

33%

6%

44% 23%

33%

43%

16%

1%1%

Transitioning our energy resources*

Clean Energy Vision

Advancing clean energy is a guiding principle to our company’s future sustainability.

By 2030:

Renewables will be over 30% of our energy mix

Carbon dioxide (CO2) emissions from fossil-fueled generation will be reduced by 40%

Water supply needs from fossil-fueled generation will be decreased by 75%

By 2050:

We will eliminate all existing coal from our energy mix

CO2 emissions from fossil-fueled generation will be reduced by 80%

Our strategy will continue to adapt based on evolving energy technologies and trends in the communities we serve.

Oil1%

IPL2024Coal Natural

gas

Renewables

42%

21% 36%WPL2024

Coal Naturalgas

Renewables

22%

26% 52%

3 Alliant Energy EEI ESG/Sustainability Qualitative T E M P L A T E

0

100

200

300

400

500

600

700

800

WindGasSolar

20212020201920182017En

ergy

add

ition

s in

Meg

awat

ts

6

660

350

6

730

550

200

2017 2018 2019 2020 2021

Marshalltown Generating Station (706 MW)

Marshalltown Generating Station (3-3.5 MW)

Dubuque Solar (6.2 MW)

Upland Prairie(300 MW)

English Farms(170 MW)

West Riverside Energy Center(730 MW) plus solar (5-7 MW)

WhisperingWillow North(Up to 200 MW)

Wind Solar Natural gas

*Approximate megawatts subject to changeAs of August 2018

Kossuth (150 MW)

Golden Plains(200 MW)

Richland(210 MW)

Planned resource additions*

$2 billion in projects underway to add 1,150 megawatts of new owned wind generation by 2021.

25% reduction in carbon dioxide (CO2) emissions from 2005 levels.

$2.3+ billion planned investments to build smarter and more resilient energy infrastructure.

40% drop in fresh water withdrawals from 2005 levels.

155 residential and 33 commercial customer rebates for electric vehicle charging stations and non-road electrification uses, such as forklifts.

85% reduction in waste from large projects going to landfills.

93,000+ volunteer hours by employees and retirees to various charity organizations.

12 Alliant Energy Growth Sites throughout our service area.

50% of the Alliant Energy Board of Directors are women.

$2 million in corporate giving to Hometown Care for electric and heating bill assistance to families in need.

by the numbersRecent actions

IPL

Coal as a percentage of Total Utility Rate Base

20% WPL18%

4 Alliant Energy EEI ESG/Sustainability Qualitative T E M P L A T E

Alliant Energy Online Corporate Sustainability Report Sitemap

Our Sustainable Developments

Energy and Climate* Operations and Environment

Customers and Community

Culture and People Governance and Performance

Our support for the United Nations Sustainable Development Goals (SDGs).

Various stories providing examples of how our actions align with the SDGs.

Clean Energy Vision

Carbon reductions and climate goals

Future energy resource mix transition and schedule

Air emissions, CO2 and water reduction targets

Integrated resource plan process

Strategic opportunities and investments

Risk management and oversight

EnvisionTM Projects

Waste minimization results

Smart Meter deployment

Grid reliability and resiliency

Solar and battery storage research

Cyber and physical security programs

Customer-owned renewable support

Second NatureTM renewable program

Electrification initiatives

Energy efficiency programs

Economic development efforts

Giving and Volunteering (Corporate, Foundation and Employee)

Our core values

Employee and public safety

Supply chain diversity and safety

Employee Resource Groups

Workforce development and training

Apprenticeship and Intern programs

Innovation and research partnerships

Governance

EEI ESG Templates

Supplemental performance data:

Fossil generation emissions

Greenhouse gases

Renewable energy

Water management

Coal combustion residuals

Environmental compliance

Ecosystem and habitat support

Energy efficiency

Electric system reliability

Natural gas system performance

Employee safety performance

Community giving

Workforce and supplier diversity

Research and development

* Please refer to this section for information relevant to the Task Force on Climate-related Financial Disclosures (TCFD) guidance. In addition, information related to our strategic plan investments and risk factors is provided in our annual Form 10-K report to the U.S. Securities and Exchange Commission.

© 2018 Alliant Energy 6333240 7/18 JS

Our online corporate sustainability report provides additional details on our practices, programs and initiatives designed to support the company’s transition to a lower carbon and increasingly sustainable energy future. The sitemap below provides a summary of where to find this information, and we encourage our stakeholders to review this information in further detail.

This template includes forward-looking statements which include future plans or strategies, our clean energy vision, transitioning our energy resources, planned resource additions, and future emissions reductions. Actual results could differ materially from those currently anticipated due to, among other things, regulatory approvals, construction issues and costs, and other factors discussed in our filings with the Securities and Exchange Commission. Alliant Energy disclaims all obligation to update these forward-looking statements.

5 Alliant Energy EEI ESG/Sustainability Qualitative T E M P L A T E