SOUTHERN CO

Net income attributable to Southern Power for 2024 was $328 million, a $29 million decrease from 2023. The decrease was primarily related to increases in scheduled outage and maintenance expenses, a prior year receipt of an arbitration award for losses previously incurred, and a prior year gain on the sale of spare parts, partially offset by an increase in PPA capacity revenues related to new natural gas PPAs and higher HLBV income associated with tax equity partnerships.

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A condensed statement of income follows:

Total operating revenues include PPA capacity revenues, which are derived primarily from long-term contracts involving natural gas facilities, and PPA energy revenues from Southern Power's generation facilities. To the extent Southern Power has capacity not contracted under a PPA, it may sell power into an accessible wholesale market, or, to the extent those generation assets are part of the FERC-approved IIC, it may sell power into the Southern Company power pool.

Natural Gas Capacity and Energy Revenue

Capacity revenues generally represent the greatest contribution to operating income and are designed to provide recovery of fixed costs plus a return on investment.

Energy is generally sold at variable cost or is indexed to published natural gas indices. Energy revenues will vary depending on the energy demand of Southern Power's customers and their generation capacity, as well as the market prices of wholesale energy compared to the cost of Southern Power's energy. Energy revenues also include fees for support services, fuel storage, and unit start charges. Increases and decreases in energy revenues under PPAs that are driven by fuel or purchased power prices are generally accompanied by an increase or decrease in fuel and purchased power costs and do not have a significant impact on net income.

Solar and Wind Energy Revenue

Southern Power's energy sales from solar and wind generating facilities are predominantly through long-term PPAs that do not have capacity revenue. Customers either purchase the energy output of a dedicated renewable facility through an energy charge or pay a fixed price related to the energy generated from the respective facility and sold to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors.

See FUTURE EARNINGS POTENTIAL – "Southern Power's Power Sales Agreements" herein for additional information regarding Southern Power's PPAs.

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Operating Revenues Details

Details of Southern Power's operating revenues were as follows:

Operating revenues for 2024 were $2.0 billion, a $175 million, or 8.0%, decrease from 2023. The change in operating revenues was primarily due to the following:

•PPA capacity revenues increased $26 million, or 5.5%, due to a net increase in MW capacity under contract from natural gas PPAs and an increase associated with a change in rates from natural gas PPAs.

•PPA energy revenues increased $1 million, or 0.1%, primarily due to an increase of $33 million related to the volume of KWHs sold primarily under natural gas and solar PPAs, largely offset by a decrease of $32 million driven by fuel and purchased power prices.

•Non-PPA revenues decreased $184 million, or 42.2%, primarily due to a decrease of $176 million related to the volume of KWHs sold through short-term sales.

•Other revenues decreased $18 million, or 32.7%, primarily due to a prior year receipt of an arbitration award for losses previously incurred and decreases in receipts of liquidated damages associated with generation facility production guarantees.

Details of Southern Power's generation and purchased power were as follows:

Southern Power's PPAs for natural gas generation generally provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing Southern Power for substantially all of the cost of fuel relating to the energy delivered under such PPAs. Consequently, changes in such fuel costs are generally accompanied by a corresponding change in related fuel revenues and do not have a significant impact on net income. Southern Power is responsible for the cost of fuel for generating units that are not covered under PPAs. Power from these generating units is sold into the wholesale market or into the Southern Company power pool for capacity owned directly by Southern Power.

Purchased power expenses will vary depending on demand, availability, and the cost of generating resources throughout the Southern Company system and other contract resources. Load requirements are submitted to the Southern Company power pool on an hourly basis and are fulfilled with the lowest cost alternative, whether that is generation owned by Southern Power, an affiliate company, or external parties. Such purchased power costs are generally recovered through PPA revenues.

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Details of Southern Power's fuel and purchased power expenses were as follows:

Total fuel and purchased power expenses decreased $165 million, or 20.1%, in 2024 as compared to 2023. Fuel expense decreased $127 million, or 18.0%, due to a $96 million decrease related to the volume of KWHs generated and a $31 million decrease associated with the average cost of fuel. Purchased power expense decreased $38 million, or 32.8%, primarily due to a $32 million decrease associated with the volume of KWHs purchased.

Other operations and maintenance expenses increased $43 million, or 9.1%, in 2024 as compared to 2023. The increase was primarily due to an increase of $32 million in scheduled outage and generation maintenance expenses and $11 million associated with an arbitration award received in 2023 related to losses previously incurred.

Depreciation and amortization increased $18 million, or 3.6%, in 2024 as compared to 2023 primarily due to a $9 million increase associated with the retirement of assets and $9 million in accelerated depreciation related to the repowering of the Kay Wind facility. See Note 15 to the financial statements under "Southern Power – Development Projects" for additional information.

Gain on Dispositions, Net

Gain on dispositions, net decreased $20 million in 2024 as compared to 2023 primarily due to a $16 million gain on the sale of spare parts in 2023.

Income Taxes (Benefit)

In 2024, income tax benefit was $13 million compared to income tax expense of $12 million for 2023, a change of $25 million. The change was primarily due to lower pre-tax earnings and higher wind and solar PTCs. See Notes 1 and 10 to the financial statements under "Income Taxes" and "Effective Tax Rate," respectively, for additional information.

Net Loss Attributable to Noncontrolling Interests

Net loss attributable to noncontrolling interests increased $14 million, or 11.0%, in 2024 as compared to 2023. The increased loss was primarily due to $23 million in higher HLBV loss allocations to tax equity partners, partially offset by $12 million in higher income allocations to equity partners.