CDP. Module: Introduction. Page: Introduction. CDP 2017 Climate Change 2017 Information Request CC0.1

CDP CDP 2017 Climate Change 2017 Information Request Ameren Corporation Module: Introduction Page: Introduction CC0.1 Introduction Please give a general description and introduction to your organization. Ameren Corporation, headquartered in St. Louis, MO, a public utility holding company with annual revenue of more than $6 billion is the parent company of Ameren Illinois, Ameren Missouri and Ameren Transmission Company (ATXI). Ameren serves approximately 2.4 million electric and more than 900,000 natural gas customers across 64,000 square miles in Illinois and Missouri. Ameren s net generating capacity, owned by Ameren Missouri, is approximately 10,200 MWs. In 2016, Ameren Missouri s energy supply was as follows; 66% from coal, 23% from nuclear, 3% from hydro, 1% from purchased wind, 1% from gas and 6% from purchased power. Ameren Missouri operates rate-regulated electric generation, transmission and distribution, and natural gas distribution businesses. Ameren Illinois Company operates rate-regulated electric distribution, natural gas distribution and electric transmission businesses. ATXI develops regional electric transmission projects. The Ameren companies share a proven record for reducing emissions from our energy centers, while controlling costs for customers. Ameren published its most recent annual Corporate Social Responsibility (CSR) report, available at AmerenCSR.com, on April 27, 2017. It discusses the challenges Ameren faces and actions being taken to achieve balance between the areas of customer and community development, workforce, environment and shareholders. The report details how Ameren Missouri is transitioning to a cleaner and more diverse generation portfolio and how overall emissions have declined over the past 20 years. Ameren s 2016 year end rate base is made up of 69% from electric and natural gas distribution investments, 15% from coal generation, 13% from non-carbon emitting nuclear and renewable generation, and 3% from gas generation. We estimate the 2021 year end rate base will include 74% from electric and natural gas distribution with coal generation declining to 13%. Over the 2017 through 2021 timeframe, significant capital investment will be directed to transmission and distribution systems to allow the system to be more efficient and provide access to new wind and solar generation. Ameren is also making strategic investments in smart grid technology, distributed energy and integration of new resources including a microgrid pilot project in Illinois. Ameren Missouri plans to file an updated Integrated Resource Plan (IRP) with the Missouri Public Service Commission in October 2017. The IRP examines electric customers projected long-term energy needs and describes Ameren Missouri s preferred approach to cost-effectively meet those needs with additional clean, diverse sources of energy while maintaining system reliability. Ameren Missouri is operating in accordance with its 2014 IRP which provides the framework to responsibly transition to a cleaner and more diverse generation portfolio over the next 20 years. The IRP provides for: achieving a 30% reduction in carbon dioxide emissions by 2035, based on 2005 levels; retiring one-third of approximately 1,800 MW of current coal-fired generating capacity; significant addition of approximately 500 MW of renewable generation; cost-effective customer energy efficiency programs that can reduce the energy needed to provide the same level of service; and extension of the operating license allowing Callaway Energy Center to operate until 2044. The plan includes operating two units at the Meramec Energy

Center on natural gas beginning in 2016, retiring all Meramec units by the end of 2022 and the Sioux Energy Center by the end of 2033. More information is available at Ameren.com/TransitionPlan and AmerenMissouri.com/IRP. FORWARD-LOOKING STATEMENTS. Statements in this report not based on historical facts are considered forward-looking and, accordingly, involve risks and uncertainties that could cause actual results to differ materially from those discussed. Although such forward-looking statements have been made in good faith and are based on reasonable assumptions, there is no assurance that the expected results will be achieved. These statements include (without limitation) statements as to future expectations, beliefs, plans, strategies, objectives, events, conditions, and performance. We are providing this cautionary statement to identify important factors that could cause actual results to differ materially from those anticipated. We refer you to our Annual Report on Form 10-K for the year ended December 31, 2016, and our other reports filed with the SEC, which contain a list of factors and a discussion of risks that could cause actual results to differ materially from management expectations suggested in such forward-looking statements. CC0.2 Reporting Year Please state the start and end date of the year for which you are reporting data. The current reporting year is the latest/most recent 12-month period for which data is reported. Enter the dates of this year first. We request data for more than one reporting period for some emission accounting questions. Please provide data for the three years prior to the current reporting year if you have not provided this information before, or if this is the first time you have answered a CDP information request. (This does not apply if you have been offered and selected the option of answering the shorter questionnaire). If you are going to provide additional years of data, please give the dates of those reporting periods here. Work backwards from the most recent reporting year. Please enter dates in following format: day(dd)/month(mm)/year(yyyy) (i.e. 31/01/2001). Enter Periods that will be disclosed Fri 01 Jan 2016 - Sat 31 Dec 2016 CC0.3 Country list configuration Please select the countries for which you will be supplying data. If you are responding to the Electric Utilities module, this selection will be carried forward to assist

you in completing your response. Select country United States of America CC0.4 Currency selection Please select the currency in which you would like to submit your response. All information contained in the response should be in this currency. USD($) CC0.6 Modules As part of the request for information on behalf of investors, companies in the electric utility sector, companies in the automobile and auto component manufacturing sector, companies in the oil and gas sector, companies in the information and communications technology sector (ICT) and companies in the food, beverage and tobacco sector (FBT) should complete supplementary questions in addition to the core questionnaire. If you are in these sector groupings, the corresponding sector modules will not appear among the options of question CC0.6 but will automatically appear in the ORS navigation bar when you save this page. If you want to query your classification, please email respond@cdp.net. If you have not been presented with a sector module that you consider would be appropriate for your company to answer, please select the module below in CC0.6. Further Information Module: Page: CC1. Governance CC1.1

Where is the highest level of direct responsibility for climate change within your organization? Senior Manager/Officer CC1.1a Please identify the position of the individual or name of the committee with this responsibility Ameren Services Senior Vice President Innovation and Corporate Strategy, Mr. Mark Fronmuller, is the lead Ameren executive charged with addressing environmental stewardship including climate change. Our operating subsidiary Presidents are responsible for decisions related to environmental strategies, including climate change, which affect their specific business segments. In addition, Warner Baxter, Ameren s Chairman, President and Chief Executive Officer is actively engaged in advocating for a transition to a cleaner portfolio in a responsible and affordable manner for our customers and the communities we serve. CC1.2 Do you provide incentives for the management of climate change issues, including the attainment of targets? Yes CC1.2a Please provide further details on the incentives provided for the management of climate change issues Who is entitled to benefit from these incentives? The type of incentives Incentivized performance indicator Comment Corporate executive team Monetary reward Emissions reduction project Efficiency project Annual monetary incentive compensation is influenced by the achievement of the Corporate Goals, which include energy efficiency, and renewable energy goals.

Who is entitled to benefit from these incentives? The type of incentives Incentivized performance indicator Comment group Energy managers Environment/Sustainability managers Other: Union employees who are involved with GHG emission regulations, energy efficiency, and sustainability Monetary reward Monetary reward Monetary reward Monetary reward Emissions reduction target Efficiency project Efficiency target Emissions reduction target Efficiency target Emissions reduction target Efficiency target Emissions reduction target Efficiency target Employees who are directly responsible for climate initiatives have specific activityrelated goals defined in their respective individual Incentive Compensation Plan. Annual monetary incentive compensation is awarded to employees based, in part, on their ability to realize and achieve these individual performance goals. Incentives are linked to individual compensation through a Performance System that includes defined Scorecard targets. For example, key performance indicators include targets for energy efficiency programs, renewable energy and GHG emission regulation support. Employees who are directly responsible for climate initiatives have specific activityrelated goals defined in their respective individual Incentive Compensation Plan. Annual monetary incentive compensation is awarded to employees based, in part, on their ability to realize and achieve these individual performance goals. Incentives are linked to individual compensation through a Performance System that includes defined Scorecard targets. Performance goals include meeting energy efficiency targets (e.g., reduction in kwh and/or Therms). Employees who are directly responsible for managing carbon emissions and climate initiatives have specific activity-related goals defined in their respective individual Incentive Compensation Plan. Annual monetary incentive compensation is awarded to employees based, in part, on their ability to realize and achieve these individual performance goals. Incentives are linked to individual compensation through a Performance System that includes defined Scorecard targets. For example, key performance indicators include targets for GHG emission regulation support and support of the Corporate Sustainability Initiative. Annual monetary incentive compensation is awarded to employees based on the achievement of climate-related operational and strategic goals [i.e., contract employees who work on energy efficiency programs and provide environmental services]. These goals are also linked to the level of individual compensation awards provided through achievement of corporate Scorecard targets. Performance against targets determines the factor by which incentive compensation is awarded to employees. Further Information

Page: CC2. Strategy CC2.1 Please select the option that best describes your risk management procedures with regard to climate change risks and opportunities Integrated into multi-disciplinary company wide risk management processes CC2.1a Please provide further details on your risk management procedures with regard to climate change risks and opportunities Frequency of monitoring To whom are results reported? Geographical areas considered How far into the future are risks considered? Comment Six-monthly or more frequently Board or individual/subset of the Board or committee appointed by the Board Ameren service territory - Missouri and Illinois > 6 years Ameren has a process for identifying risks and opportunities associated with climate change. This process allows Ameren to make prudent decisions, while meeting customers energy needs in a safe, reliable, efficient and environmentally responsible manner. We assess risks associated with climate change, including risks related to regulatory changes, changes in customer behavior, reputation, and weather. Ameren has established a Risk Steering Committee (RMSC) with responsibility for oversight of enterprise risk management. Ameren s RMSC meets at least every other month. In addition, Ameren management reports regularly on environmental compliance matters to the Nuclear and Operations Committee of Ameren s Board of Directors. The full Board of Directors oversees environmental policy and the potential impact of climate change on the company s strategy. CC2.1b Please describe how your risk and opportunity identification processes are applied at both company and asset level

The majority of climate-related risks and opportunities are identified by Environmental Services and Generation Resource Planning (ES & GRP) through analysis, research and discussions with business segments. Once a potential risk/opportunity is identified a subject matter expert studies it. That evaluation is robust and includes regulatory, physical, and reputational risk/opportunity factors. This process helps senior management identify risks/opportunities, mitigation strategies and potential implications. Recommendations are communicated to the ES & GRP functions, business segments and the Ameren Executive Leadership Team as necessary. Ameren established an Enterprise Risk (ERM) Team for governance and oversight of enterprise risks and opportunities. Each enterprise risk has an internal owner who is required to periodically review that risk and update it along with the current risk mitigation plan. Risks are evaluated on criteria associated with impacts and probability associated with the likelihood of impact. The ERM process is used to ensure corporate objectives are consistent with the overall risk tolerance of the Company. It integrates risk assessment into decision making at appropriate levels, while effectively mitigating significant risks. ERM increases accountability for risk identification, assessment and mitigation. Ameren management reports regularly on environmental compliance matters to the Nuclear and Operations Committee of Ameren s Board of Directors. The full Board of Directors oversees environmental policy and the potential impact of climate change on the company s strategy. Ameren also has a Risk Steering Committee (RMSC) for governance and oversight of enterprise risk management. Its goals are to enhance the ERM structure, further enable cross segment risk portfolio management, create solid ties to emergent risks, and incorporate detailed analysis for topical areas including Environmental. CC2.1c How do you prioritize the risks and opportunities identified? All risks and opportunities are qualified and quantified using a consistent risk framework and methodology. After the qualification and quantification process is complete, the risks and opportunities are reviewed by the risk owner, function/department owner, and ultimately approved by the segment/business line owner. Risks and opportunities are then prioritized by their exposed value to the company. Those with the highest exposure are prioritized first. The business lines, along with the Risk Steering Committee, perform a deeper dive into the top three exposed values in each category/profile type. The deeper dive includes a discussion of the risk/opportunity tolerance, residual mitigation plans, and cost to mitigate. CC2.1d Please explain why you do not have a process in place for assessing and managing risks and opportunities from climate change, and whether you plan to introduce such a process in future Main reason for not having a process Do you plan to introduce a process? Comment CC2.2

Is climate change integrated into your business strategy? Yes CC2.2a Please describe the process of how climate change is integrated into your business strategy and any outcomes of this process Ameren s strategy is to invest in rate-regulated energy infrastructure which, when coupled with relentlessly improving operating performance and advocating for responsible energy policies, will deliver superior growth in shareholder and customer value. As a part of that effort, Ameren continues to develop initiatives to address climate change, while managing long-term customer costs. Examples include the planned retirement of approximately one-third (about 1,800 MW) of Ameren Missouri s current coal-fired generating capacity by 2034, operating two units at Meramec Energy Center only on natural gas beginning in 2016, retiring all remaining units at the Meramec Energy Center by the end of 2022 and the Sioux Energy Center by the end of 2033, a new solar park at O Fallon, Missouri and wind purchase agreements. Ameren s long term goal is to transition to a cleaner and more diverse generation portfolio and mitigate potential cost impacts to customers. By year end of 2021, we estimate our rate base will include 74% from electric and natural gas distribution with coal generation declining to 13%. Ameren Missouri published its Integrated Resource Plan (IRP) in October 2014. To ensure that we are able to meet customers long-term energy needs and to address the challenges of our aging fleet of coal-fired generators, Ameren Missouri is implementing a plan designed to satisfy the following objectives: Transition Ameren Missouri s resource mix to a cleaner, more renewable and diverse portfolio in a responsible fashion over the next 20 years; manage the transition of our generation fleet, and plan for eventual closure of aging coal-fired resources at the end of their useful lives, in a way that is beneficial to customers, shareholders, the environment, and our communities; and create and maintain flexibility, economic, technological, regulatory, environmental, etc. to be able to effectively adapt to changing conditions. Climate change was explicitly considered as a part of that plan development. Major components of the plan include: Significantly expanding renewable generation by adding 400 MW of wind power, 45 MW of solar, 28 MW of hydroelectric and 5 MW of landfill gas. Continuing to offer energy efficiency programs to customers through the utility's Act On Energy program and adding demand response programs when they are cost-effective. Retiring approximately one-third (about 1,800 MW) of Ameren Missouri's current coal-fired generating capacity. This includes operating two units at Meramec Energy Center only on natural gas beginning in 2016, and retiring all units at Meramec by the end of 2022 and the Sioux Energy Center by the end of 2033. Reducing emissions of Ameren Missouri's existing coal fleet by continuing to make investments in pollution-control equipment; continuing to rely on Ameren Missouri's existing, low-cost and dependable nuclear generation while preserving options for future carbon-free nuclear generation. Many of the technical and policy discussions related to climate change and a sustainable energy future focus on energy efficiency and renewable resources. This provides opportunities for Ameren to implement energy efficiency programs that enable the achievement of climate goals and lower the impacts of regulatory compliance costs to the consumer and improving our relationship with our customers. Ameren spent approximately $105.3 million in 2016 to develop and implement energy efficiency programs, including educational programs, installation of energy efficient heating and air conditioning systems, weatherization of homes of low-income customers, and other residential and business programs. Ameren estimates emission savings of 510,659 metric tons of CO2 in 2016 from these programs. These programs are expected to continue through 2018 in Missouri and 2021 in Illinois with the current regulatory treatment in place. Ameren companies are able to provide customer information through the Energy Saving Toolkit and the Power Smart Pricing programs to allow customers to understand and manage their energy consumption through these programs. In March 2016, Ameren Missouri received approval for a three-year energy efficiency plan (2016-2018) from the Missouri Public Service Commission. The three year program includes a

comprehensive portfolio of incentives for business and residential customers, representing an investment of approximately $158 million over three years. Ameren believes achieving meaningful GHG reductions will require the deployment of low or zero GHG-emitting generation. Future new nuclear generation could be a part of the solution if cost issues can be resolved to make it a less costly option. The Company continues to evaluate nuclear resources as a part of its IRP process and has received Nuclear Regulatory Commission approval to extend the operating license of its nuclear generating energy center to 2044. Ameren is increasing the operating efficiency and capacity of its hydroelectric plants, offsetting fossil fuel generation. In 2016 Ameren continued to obtain renewable energy from Horizon Wind Energy s (now known as EDPR) Pioneer Prairie Wind Farm in Iowa through a 15-year wind power purchase agreement, operation of its 5.7MW (DC Gross) solar park at O Fallon, MO and its 15 MW (Gross) landfill gas facility in St. Louis County, MO. Since 2010, Ameren Missouri has issued over $97 million in solar rebates resulting in approximately 56 MWs of customer installed solar generation. Also, the company continued a voluntary program-pure Power by selling RECs to customers. Ameren Missouri funded approximately $286,000 toward the purchase of solar-recs with its customers who entered into long-term contracts. CC2.2b Please explain why climate change is not integrated into your business strategy CC2.2c Does your company use an internal price on carbon? Yes CC2.2d Please provide details and examples of how your company uses an internal price on carbon Ameren includes a carbon price in its evaluation of long-term resource planning for its Missouri regulated business through its Integrated Resource Plan (IRP) process (i.e., Scope 1 emissions from generation) (i). The price is included to represent the expectation for either regulation of carbon dioxide emissions through a mechanism that establishes an explicit price for carbon dioxide emissions, such as a carbon tax or cap-and-trade program, or through voluntary emission credit trading markets established by RTOs or state or regional alliances (ii). For its 2014 IRP, Ameren Missouri used a base price of $34 per ton starting in 2025 and escalating at approximately 8.5% per year, with a low price scenario starting at $23 per ton and a high scenario starting at $53 per ton, both starting in 2025 (iii and iv). The prices used in the IRP process are established based on discussions with Company executives involved in environmental, regulatory and legislative activities (v). Establishment of the carbon price assumptions includes a review of price assumptions used or produced by other utilities, policy analysts, and government agencies, including the Social Carbon estimates used by the federal government. Ameren Missouri s 2014 IRP describes in detail the process

used to establish carbon price assumptions for its evaluations at that time. The same general process continues to be used. Inclusion of a carbon price affects Ameren Missouri s evaluation of both new and existing generation resources, including potential retirement of fossil generation, and also increases the cost effectiveness of energy efficiency measures (vi). CC2.3 Do you engage in activities that could either directly or indirectly influence public policy on climate change through any of the following? (tick all that apply) Direct engagement with policy makers Trade associations Funding research organizations CC2.3a On what issues have you been engaging directly with policy makers? Focus of legislation Corporate Position Details of engagement Proposed legislative solution Energy efficiency Other: NSPS legislation Other: Limit transmission projects that can have expedited process with Illinois Commerce Commission Support Support Oppose Ameren Illinois joined with energy stakeholders in supporting the Future Energy Jobs Bill. Under the legislation, signed into law in December 2016, Ameren Illinois will increase its investments in energy efficiency. The bill also includes language to extend the state s landmark Smart Grid Law, passed in 2011, Due to EPA development of regulations for new and existing power plants Ameren has been supporting legislation to address the impact and timing of the regulation through legislation. Ameren Illinois informed legislators on the importance of strengthening and expanding our transmission systems, including the need to facilitate the delivery of new renewable energy sources to our customers. Ameren Illinois desired to continue investing in modernizing its electric distribution system while seeking recovery under a formula ratemaking process as well as increasing it s investments in energy efficiency. To accomplish this, Ameren Illinois joined with energy stakeholders in supporting the Future Energy Jobs Bill. Limit the implementation of regulations until carbon capture and sequestration has been adequately demonstrated at a certain number of facilities as well as allow Congress to establish the implementation date of the regulations Legislation would limit transmission projects that can be filed through the expedited process at the Illinois Commerce Commission. Without the expedited process, utilities face a lengthy and unpredictable process at the Illinois Commerce Commission. Adaptation resiliency Support Ameren Missouri supported the "21st Century Grid The 21st century grid modernization and security act would

Focus of legislation Corporate Position Details of engagement Proposed legislative solution Modernization and Security Act" legislation to modernize the regulatory process for electrical corporations to more closely align the interests of electrical corporations and customers they serve by: (1)Allowing for the imposition of earnings caps, rate caps, performance standards and other customer protections; (2) Providing a meaningful opportunity for electrical corporations to recover on a timely basis the actual, prudently incurred costs of providing reliable electric service; (3) Establishing policies that encourage investment in Missouri electrical infrastructure; and (4) Providing globally competitive electric power rates for energy intensive customers. create a performance-based regulatory construct for electrical corporations that provides greater certainty to both customers and electrical corporations, and fosters the provision of reliable and affordable electric services for the benefit of customers. In addition, this will improve reliability and accelerate more efficient energy delivery systems and create opportunities for lower energy consumptions by customers and reduced line losses. CC2.3b Are you on the Board of any trade associations or provide funding beyond membership? No CC2.3c Please enter the details of those trade associations that are likely to take a position on climate change legislation Trade association Is your position on climate change consistent with theirs? Please explain the trade association's position How have you, or are you attempting to, influence the position? CC2.3d Do you publicly disclose a list of all the research organizations that you fund? Yes

CC2.3e Please provide details of the other engagement activities that you undertake CC2.3f What processes do you have in place to ensure that all of your direct and indirect activities that influence policy are consistent with your overall climate change strategy? Ameren Services Company s Senior Vice President, Innovation and Corporate Strategy is the lead Ameren executive charged with addressing environmental stewardship. The Ameren Services Senior Vice President reports to the Executive Vice President & Chief Financial Officer who reports directly to Ameren s Chairman, President and Chief Executive Officer. Ameren has a Risk Steering Committee (RMSC) which is responsible for oversight of enterprise risk management and meets at least every other month. Where appropriate, business segment senior leaders report on environmental risks and opportunities to the Nuclear and Operations Committee of the Board of Directors. The full Board of Directors oversees environmental policy and potential impact of climate-related risks on the company s strategy. CC2.3g Please explain why you do not engage with policy makers Further Information Page: CC3. Targets and Initiatives CC3.1 Did you have an emissions reduction or renewable energy consumption or production target that was active (ongoing or reached completion) in the reporting year? Absolute target Renewable energy consumption and/or production target

CC3.1a Please provide details of your absolute target ID Scope % of emissions in scope % reduction from base year Base year Base year emissions covered by target (metric tonnes CO2e) Target year Is this a science-based target? Comment Abs1 Abs2 Abs3 Abs4 Abs5 Abs6 Scope 1 Scope 1 Scope 1 Scope 1 Scope 1 Scope 1 100% 2.4% 2015 28548178 2016 100% 1.3% 2015 28548178 2016 100% 0.1% 2015 28548178 2016 100% 28.1% 2015 28548178 2016 100% 5% 2015 28548178 2016 100% 11.9% 2013 30214592 2034 No, and we do not anticipate setting one in the next 2 years No, and we do not anticipate setting one in the next 2 years No, and we do not anticipate setting one in the next 2 years No, and we do not anticipate setting one in the next 2 years No, and we do not anticipate setting one in the next 2 years No, and we do not anticipate Ameren Missouri Energy Efficiency Electric Programs 02/01/2016-02/28/2019 Savings Target: 739 GWh (approximately 695,000 metric tons of CO2, assuming CO2 emission factor of 0.87 metric ton/mwh and adjusting for line losses) Ameren Illinois Energy Efficiency Electric Programs (Planning Year 8: 06/01/2015-05/31/2016) Savings Target: 339,867 MWh (approximately 295,000 metric tons of CO2, assuming CO2 emission factor of 0.87 metric ton/mwh and adjusting for line losses) Ameren Illinois Energy Efficiency Natural Gas Programs (Planning Year 8: 06/01/2015-05/31/2016) Savings Target: 5,369,967 therms (approximately 28,848 metric tons of CO2) Ameren Missouri Nuclear Generation (non-carbon emitting generation): 2016 Target--- 9,210,700 MWh (approximately 8,013,309 metric tons of CO2, assuming CO2 emission factor of 0.87 metric ton/mwh) Ameren Missouri Hydroelectric Generation (non-carbon emitting generation): 2016 Target--1,632,200 MWh (approximately 1,420,014 metric tons of CO2, assuming CO2 emission factor of 0.87 metric ton/mwh) Ameren Missouri Generation: Planned Retirements The 2014 IRP includes plans to retire approximately one-third

ID Scope % of emissions in scope % reduction from base year Base year Base year emissions covered by target (metric tonnes CO2e) Target year Is this a science-based target? Comment setting one in the next 2 years (about 1,800 MW) of Ameren Missouri s current coal-fired generating capacity by 2034. This includes operating two units at Meramec Energy Center only on natural gas beginning in 2016, and retiring all remaining units at the Meramec Energy Center by the end of 2022 and the Sioux Energy Center by the end of 2033. Operating two Meramec energy center units on natural gas rather than coal resulted in an approximate reduction in CO2 emissions of over 450,000 metric tons from 2015 to 2016. CC3.1b Please provide details of your intensity target ID Scope % of emissions in scope % reduction from base year Metric Base year Normalized base year emissions covered by target Target year Is this a sciencebased target? Comment CC3.1c Please also indicate what change in absolute emissions this intensity target reflects

ID Direction of change anticipated in absolute Scope 1+2 emissions at target completion? % change anticipated in absolute Scope 1+2 emissions Direction of change anticipated in absolute Scope 3 emissions at target completion? % change anticipated in absolute Scope 3 emissions Comment CC3.1d Please provide details of your renewable energy consumption and/or production target ID Energy types covered by target Base year Base year energy for energy type covered (MWh) % renewable energy in base year Target year % renewable energy in target year Comment RE1 RE2 Other: Renewable Energy Credits - Missouri Other: Renewable Energy Credits - Illinois 2015 32872258 5% 2016 5% 2015 7212247 9% 2016 10% The 2016 Missouri RES requirement was 1,643,613 REC s or 5% of the total retail electric sales of 32,872,258 MWh for 2016. REC s generated in previous years, though the banking provision in the law, from solar, wind, landfill gas, and hydroelectric (Keokuk Energy Center) were used to meet compliance. 2016 Ameren Illinois RECs: 1,053,392 MWhs. The Ameren Illinois customers on the Fixed Price BGS tariff were supplied a total of 7,212,247 MWh for calendar year 2016. CC3.1e For all of your targets, please provide details on the progress made in the reporting year

ID % complete (time) % complete (emissions or renewable energy) Comment Abs1 100% 100% Reduced emissions by 2.4%. Abs2 100% 100% Reduced emissions by 1.34%. Abs3 100% 100% Reduced emissions by 0.10%. Abs4 100% 100% Achieved 102% of the target Abs5 100% 100% Achieved 92.5% of the target Abs6 10% 11.9% On schedule RE1 100% 100% Complied with 2016 Renewable Energy Standard for Missouri, RE2 100% 100% Complied with 2016 Renewable Energy Standard for Illinois, CC3.1f Please explain (i) why you do not have a target; and (ii) forecast how your emissions will change over the next five years CC3.2 Do you classify any of your existing goods and/or services as low carbon products or do they enable a third party to avoid GHG emissions? Yes CC3.2a Please provide details of your products and/or services that you classify as low carbon products or that enable a third party to avoid GHG emissions

Level of aggregation Description of product/group of products Are you reporting low carbon product/s or avoided emissions? Taxonomy, project or methodology used to classify product/s as low carbon or to calculate avoided emissions % revenue from low carbon product/s in the reporting year % R&D in low carbon product/s in the reporting year Comment Product Product Product Pure Power voluntary REC program for customers Sale of fly ash for direct replacement of cement Ameren Missouri Solar Rebates Avoided emissions Avoided emissions Avoided emissions Other: based on emission factors for Ameren s region contained in the EPA egrid system Other: based on emission factors for Ameren s region contained in the EPA egrid system Other: based on emission factors for Ameren s region contained in the EPA egrid system Ameren Missouri s voluntary green program called Pure Power sold 57,486 RECs to customers in 2016. Since the start of the program in 2007, the RECs were retired on behalf of these customers with a potential reduction in over 558,000 metric tons of Scope 1 CO2 assuming 0.87 metric tons of CO2 per 1 MWh and adjusting for line losses. Fly ash generated from burning low-sulfur Western coal can be used as a direct replacement for cement, thereby reducing carbon emissions at cement kilns. Our industry estimates that the avoided emissions are approximately 0.9 tons of CO2 avoided per 1 ton of fly ash used as a replacement for cement. We consider the emissions are avoided in the same year that they are taken from our facilities, and for 2016, the amount would be more than 151,285 tons of Scope 3 CO2 offset. In 2010, Ameren Missouri began to issue solar rebates to customers who install solar electric generating systems on their homes and businesses. By the end of 2016, Ameren Missouri had approximately 56 MWs of customer-installed solar generation in its service territory. By generating emissions-free renewable energy at their homes and businesses, customers reduce the amount of power they purchase from the utility. This has the potential to produce in excess of 77,000 MWh per year, avoiding over 67,000 metric tons of Scope 1 CO2, assuming 0.87 metric tons of CO2 per 1 MWh. The utility generates less power and therefore lowers its GHG emissions, as a result of these systems.

Level of aggregation Description of product/group of products Are you reporting low carbon product/s or avoided emissions? Taxonomy, project or methodology used to classify product/s as low carbon or to calculate avoided emissions % revenue from low carbon product/s in the reporting year % R&D in low carbon product/s in the reporting year Comment Product Product Product Ameren Missouri Energy Efficiency Ameren Illinois Energy Efficiency Ameren Natural Gas Energy Efficiency Avoided emissions Avoided emissions Avoided emissions Other: based on emission factors for Ameren s region contained in the EPA egrid system Other: based on emission factors for Ameren s region contained in the EPA egrid system Other: based on emission factors for Ameren s region contained in the EPA egrid system Changes in how our customers use electricity can reduce emissions through implementation of more efficient technologies or operations. Demand Side -Electricity Energy Efficiency programs are offered to our electricity customers in both Missouri and Illinois. This provides opportunities for Ameren to implement energy efficiency programs that enable the achievement of climate goals and lower the impacts of climate costs to the consumer, improving our relationship with our customers. The energy efficiency programs include education programs, installation of energy efficient heating and air conditioning systems, home energy audits, low-income weatherization, programmable thermostat programs, and other residential and business programs. Ameren Missouri has an energy efficiency program approved through 2018 that saved approximately 153,000 MWh in 2016 and avoided approximately 143,754 metric tons of Scope 1 CO2, assuming 0.87 metric tons of CO2 per 1 MWh and adjusting for line losses. Ameren Illinois has an energy efficiency program approved through 2021 that in 2016 saved approximately 351,878 MWh and avoided approximately 330,614 metric tons of Scope 1 CO2, assuming 0.87 metric tons of CO2 per 1 MWH and adjusting for line losses. Demand Side -Natural Gas. Energy efficiency programs are offered to our natural gas customers in Illinois and Missouri. The natural gas energy efficiency programs provide incentives to customers when they purchase specific energy efficiency gas equipment, such as furnaces, boilers or

Stage of development Number of projects Total estimated annual CO2e savings in metric tonnes CO2e (only for rows marked *) Under investigation 0 0 To be implemented* 0 0 Implementation commenced* 0 0 Implemented* 16 579576 Not to be implemented 0 0 CC3.3b For those initiatives implemented in the reporting year, please provide details in the table below Activity type Description of activity annual CO2e savings (metric tonnes CO2e) Scope Voluntary/ Mandatory Annual monetary savings (unit currency - as specified in CC0.4) Investment required (unit currency - as specified in CC0.4) Payback period lifetime of the initiative Comment Energy efficiency: Processes Demand side management-electricity. Energy efficiency programs are offered to our electric customers in both Missouri and Illinois. These help Ameren reduce exposure related to GHG s while improving our relationship with our 510659 Scope 1 Voluntary 15754589 105341557 4-10 years 3-5 years Ameren Missouri program is approved through 2018 and Ameren Illinois program is approved through 2021. The savings shown are estimates of savings to customers rather than utility savings from the

Activity type Description of activity annual CO2e savings (metric tonnes CO2e) Scope Voluntary/ Mandatory Annual monetary savings (unit currency - as specified in CC0.4) Investment required (unit currency - as specified in CC0.4) Payback period lifetime of the initiative Comment customers. These energy efficiency programs include education programs, installation of efficient heating and air conditioning systems, home energy audits, lowincome weatherization, programmable thermostat programs, and other residential and business programs. Ameren Missouri has an energy efficiency program that saved approximately 153,000 MWh (January 2016-December 2016) and avoided approximately 143,754 metric tons, assuming 0.87 metric tons of CO2 per 1 MWh and adjusting for line losses. In 2016 Ameren Illinois saved 351,878 MWh and avoided approximately 330,765 metric tons, assuming 0.87 metric tons of CO2 per 1 MWh and adjusting for line losses. Demand side management-natural programs.

Activity type Description of activity annual CO2e savings (metric tonnes CO2e) Scope Voluntary/ Mandatory Annual monetary savings (unit currency - as specified in CC0.4) Investment required (unit currency - as specified in CC0.4) Payback period lifetime of the initiative Comment Gas. Energy efficiency programs are offered to our natural gas customers in Illinois and Missouri. The natural gas energy efficiency program provides incentives to customers when they purchase specific energy efficiency gas equipment, such as furnaces, boilers or manufacturing equipment. Ameren Illinois program saved approximately 6.8 million therms in 2016 and avoided approximately 36,000 metric tons of customer CO2, assuming 11.7 pounds of CO2 per 1 therm. Ameren Missouri is actively engaged in implementing gas energy efficiency measures although there are no currently defined savings targets. Ameren Missouri saved approximately 13,900 therms in 2015 and avoided approximately 74 metric tons of customer CO2,

Activity type Description of activity annual CO2e savings (metric tonnes CO2e) Scope Voluntary/ Mandatory Annual monetary savings (unit currency - as specified in CC0.4) Investment required (unit currency - as specified in CC0.4) Payback period lifetime of the initiative Comment Low carbon energy purchase Low carbon energy installation assuming 11.7 pounds of CO2 per 1 therm. While these programs are voluntary there are earnings opportunities for implementing. In 2009, Ameren executed a 15-year wind power purchase agreement and is taking 102 megawatts (MWs) of wind energy from Horizon Wind Energy s (now known as EDPR) Pioneer Prairie Wind Farm in Iowa. In 2016, the agreement provided about 318,943 MWhs. It satisfies RPS mandates in Missouri. Monetary Savings and Investment Required---Confidential In December 2010, Ameren completed construction of approximately 90 kw of solar at its headquarters building in downtown St. Louis. The current array produces approximately 90 MWh per year of 277480 57477 Scope 1 Scope 1 Mandatory Mandatory 0 0 1791900 60800000 11-15 years 16-20 years 11-15 years 16-20 years For competitive reasons, Ameren is not allowed to disclose the cost or value associated with the wind purchase contract it has with EDPR. lifetimes are 20 years for solar facility and 15 years for landfill gas facility

Activity type Description of activity annual CO2e savings (metric tonnes CO2e) Scope Voluntary/ Mandatory Annual monetary savings (unit currency - as specified in CC0.4) Investment required (unit currency - as specified in CC0.4) Payback period lifetime of the initiative Comment Transportation: fleet Ameren has 5 diesel/electric hybrid bucket trucks that potentially use 30-50% less fuel than conventional vehicles. Ameren Illinois added 5 new PHEV trucks bringing the total number to 8. These potentially use 30-50% less diesel fuel than conventional vehicles. Ameren Illinois added 1 new CNG truck increasing its total to 3. CNG has lower GHG emissions than gasoline. Ameren Illinois added 1 new electric vehicle bringing the total to 4. Ameren Illinois increased use of B20 bio-diesel to 94,000 gallons, resulting in a reduction of about 14 metric tons of CO2 emissions. In 2011, Ameren piloted the use of navigational tools to reduce idle time and optimize vehicle usage. In 2013, Ameren began installing navigational 991 Scope 1 Voluntary 1228 1140000 1-3 years Ongoing The amount of CO2 emissions savings and cost savings are netted in the emissions summary for fuel usage by Ameren's vehicle fleet as well as its vehicle fuel cost. It is difficult to know how much fuel would have been consumed without the JEMS and Telematics systems. Information provided for telematics systems only.

Activity type Description of activity annual CO2e savings (metric tonnes CO2e) Scope Voluntary/ Mandatory Annual monetary savings (unit currency - as specified in CC0.4) Investment required (unit currency - as specified in CC0.4) Payback period lifetime of the initiative Comment tools in the majority of the fleet to better understand vehicle usage, reduce idle time, and optimize vehicle usage. Ameren Illinois implemented an idle reduction policy on Jan. 1, 2015. Telematics allows Ameren Illinois to optimize vehicle usage resulting in lower fuel consumption. In 2016, Ameren Illinois maintained its 20% reduction in idle time from 2014 resulting in a 2.2 million lb reduction of CO2. Ameren Missouri has 44 vehicles with plugin technology including 35 bucket trucks with Jobsite Energy Systems (JEMS). The JEMS units have plug-in auxiliary electric drive systems to supplement standard engine driven systems so truck engines do not have to idle when the boom is operating. This reduces fuel consumption and

Activity type Description of activity annual CO2e savings (metric tonnes CO2e) Scope Voluntary/ Mandatory Annual monetary savings (unit currency - as specified in CC0.4) Investment required (unit currency - as specified in CC0.4) Payback period lifetime of the initiative Comment compliance with anti-idle legislation and ordinances. Ameren Missouri has 2 Plug-in Hybrid Electric Vehicles and 7 battery electric vehicles, 4 of which were added in 2016. 3 of these are replaced replaced gasoline vehicles which patrol the main campus. Electric vehicle charging stations were added at Ameren Missouri facilities in 2016 bringing the total to 55 charging stations. Ameren committed to the Edison Electric Institute (EEI) Fleet Electrification Initiative goal of investing five percent of our annual fleet budget on plug-in vehicle technology. As part of the initiative Ameren Illinois purchased 3 Plug-In hybrid electric vehicles (PHEVs) with E- PTO technology---altec JEMS technology in 2015. In 2016, Ameren Illinois added 5 additional PHEV trucks and 1 EV. In

Activity type Description of activity annual CO2e savings (metric tonnes CO2e) Scope Voluntary/ Mandatory Annual monetary savings (unit currency - as specified in CC0.4) Investment required (unit currency - as specified in CC0.4) Payback period lifetime of the initiative Comment Energy efficiency: Building services 2016 Ameren maintained electric vehicle charging stations at various Ameren locations in Missouri and Illinois for a total of 60 stations. Ameren has implemented various voluntary initiatives to improve efficiency and reduce GHG emissions at facilities dedicated to housing its personnel and operating equipment. These initiatives include replacing roofing systems, T12 fluorescent fixtures with energy efficient T5 and LED fixtures. Lighting levels in the facilities were assessed and where applicable fixture counts were reduced to meet current standards. In 2016 Ameren completed several energy efficiency projects that will reduce energy consumption by more than 424,322 kwh annually and reduce our 378 Scope 2 (locationbased) Voluntary 10646 465141 >25 years Ongoing Ongoing program with no estimated life.