Other Events.

decreased net energy costs of approximately $100 million otherwise subject to FAC recovery;

higher weather-normalized customer sales volumes, which reduced the rate request by approximately $55 million;

decreased expenses, other than net energy costs, of approximately $20 million, which includes a decrease to those expenses subject to regulatory recovery mechanisms of approximately $80 million;

increased depreciation and amortization expense of $115 million for new electric infrastructure investments, of which approximately $35 million reflects higher depreciation rates and of which approximately $35 million would otherwise be deferred under plant-in-service accounting (“PISA”); and

an increase of approximately $60 million of pre-tax return on rate base, which includes both the debt and equity components, of which approximately $30 million would otherwise be deferred under PISA.

regulatory, judicial, or legislative actions, and any changes in regulatory policies and ratemaking determinations, such as those that may result from Ameren Missouri’s natural gas regulatory rate review filed with the MoPSC in December 2018, an appeal filed by the Missouri Office of Public Counsel in January 2019 in Ameren Missouri’s renewable energy standard rate adjustment mechanism case, and future regulatory, judicial, or legislative actions that change regulatory recovery mechanisms;

the effect of Missouri Senate Bill 564 on Ameren Missouri, including as a result of Ameren Missouri’s election to use PISA and the resulting customer rate caps;

the effects of changes in federal, state, or local laws and other governmental actions, including monetary, fiscal, and energy policies;

the effects on demand for our services resulting from technological advances, including advances in customer energy efficiency, energy storage, and private generation sources, which generate electricity at the site of consumption and are becoming more cost-competitive;

the effectiveness of Ameren Missouri’s customer energy-efficiency programs and the related revenues and performance incentives earned under its Missouri Energy Efficiency Investment Act programs;

our ability to align overall spending, both operating and capital, with frameworks established by our regulators and to recover these costs in a timely manner in our attempt to earn our allowed returns on equity;

the cost and availability of fuel, such as ultra-low-sulfur coal, natural gas, and enriched uranium used to produce electricity; the cost and availability of purchased power and renewable energy credits; and the level and volatility of future market prices for such commodities and credits, including our ability to recover the costs for such commodities and credits and our customers’ tolerance for any related price increases;

disruptions in the delivery of fuel, failure of our fuel suppliers to provide adequate quantities or quality of fuel, or lack of adequate inventories of fuel, including nuclear fuel assemblies from the one Nuclear Regulatory Commission-licensed supplier of Ameren Missouri’s Callaway energy center’s assemblies;

the cost and availability of transmission capacity for the energy generated by Ameren Missouri’s energy centers or required to satisfy Ameren Missouri’s energy sales;

the effectiveness of our risk management strategies and our use of financial and derivative instruments;

the ability to obtain sufficient insurance, including insurance for Ameren Missouri’s Callaway energy center, or, in the absence of insurance, the ability to recover uninsured losses from our customers;

the impact of cyberattacks on us or our suppliers, which could, among other things, result in the loss of operational control of energy centers and electric and natural gas transmission and distribution systems and/or the loss of data, such as customer, employee, financial, and operating system information;

business and economic conditions, including their impact on interest rates, collection of our receivable balances, and demand for our products;

disruptions of the capital markets, deterioration in our credit metrics, including as a result of the implementation of the Tax Cuts and Jobs Act of 2017, or other events that may have an adverse effect on the cost or availability of capital, including short-term credit and liquidity;

the actions of credit rating agencies and the effects of such actions;

the inability of our counterparties to meet their obligations with respect to contracts, credit agreements, and financial instruments;

the impact of weather conditions and other natural phenomena on us and our customers, including the impact of system outages;

the construction, installation, performance, and cost recovery of generation, transmission, and distribution assets;

the effects of breakdowns or failures of electric generation, transmission, or distribution equipment or facilities, which could result in unanticipated liabilities or unplanned outages;

the operation of Ameren Missouri’s Callaway energy center, including planned and unplanned outages, and decommissioning costs;

the impact of current environmental laws and new, more stringent, or changing requirements, including those related to carbon dioxide and the Affordable Clean Energy Rule, other emissions and discharges, cooling water intake structures, coal combustion residuals, and energy efficiency, that could limit or terminate the operation of certain of Ameren Missouri’s energy centers, increase our operating costs or investment requirements, result in an impairment of our assets, cause us to sell our assets, reduce our customers’ demand for electricity or natural gas, or otherwise have a negative financial effect;

the impact of complying with renewable energy requirements in Missouri;

labor disputes, work force reductions, changes in future wage and employee benefits costs, including those resulting from changes in discount rates, mortality tables, returns on benefit plan assets, and other assumptions;

the impact of negative opinions of us or our utility services that our customers, legislators, or regulators may have or develop, which could result from a variety of factors, including failures in system reliability, failure to implement our investment plans or to protect sensitive customer information, increases in rates, or negative media coverage;

the impact of adopting new accounting guidance;

the effects of strategic initiatives, including mergers, acquisitions, and divestitures;

legal and administrative proceedings; and

acts of sabotage, war, terrorism, or other intentionally disruptive acts.