Southern Company (SO)

Southern Company is a holding company with no operations of its own, owner of three regulated electric utilities (Alabama, Georgia and Mississippi Power) with a solid regulatory moat, plus Southern Company Gas (regulated gas distribution) and Southern Power (contract-based generation, the smaller piece and most distinct in nature). Georgia Power, the largest subsidiary, executes within its authorized ROE band (9.50%-11.90%, fixed point 10.50%) and sits at the center of data center and artificial intelligence demand that drives a construction program that has nearly doubled in two years, with a five-year estimate (2026-2030, US$78,100 million) ~73% higher than the prior three-year period.

It is valued on P/E over attributable net income ($4,363M TTM, EPS ~$3.86), which yields equity directly. At ~$90 it trades at ~25× that income — the highest multiple among the utilities in the library (Duke ~18.8×, NextEra ~22.4× on adjusted income, the sector average ~16.8× forward), reflecting the re-rating for Georgia Power's exposure to AI demand. The base case starts net income at +7.0% (above the noisy reported TTM +0.5%, which carries FY2025 non-recurring charges disclosed at ~$223M net, and below the accelerated revenue trajectory of +8.1%/+6.2%) decelerating to +5.0% by year 5, with the multiple compressing from ~25× today to ~16.5× — within the band for a quality regulated utility (15-18×, §4), well below the entry multiple. Dilution from the equity issuance funding the construction program (~2%/year, in line with the real trajectory of diluted shares FY22-TTM) is already inside EPS per share, and has a concrete mechanism already committed: the November 2025 Equity Units (US$2,000 million) require purchasing common stock no later than 15-Dec-2028, consistent with the 10-K itself anticipating that dividends + capex + debt maturities will exceed operating cash flow over the 2026-2028 three-year window. That yields ~$77/share → a price CAGR of -3%, +1% including the dividend (3.4%).

No margin of safety: at this price capital is preserved, but it is not bought below its value. The base return (+1% total: -3%/year in price and +4% from the dividend) falls short of the average return on stocks (~10%, the method's bar). The verdict is Preserves value: the business is genuinely high-quality —Georgia Power executes within its authorized ROE band, and the balance sheet sustains investment grade with staggered debt maturities and no disproportionate spike— but at ~25× earnings, today's price already prices in a large share of the sector-wide enthusiasm for data-center demand, and much of the multiple compression the business needs to grow toward the 5-year value is already underway.

Four things. Whether the projected data-center demand materializes and regulators recognize the associated capex in rates without friction — Georgia Power already committed, as a condition of the December 2025 Certification Stipulation, to a downward pressure of at least US$556 million/year on that incremental revenue in its next general rate case (2029-2031), the structural disconfirmer with its own cost-overrun precedent at Plant Vogtle. Whether the multiple converges toward the band for a regulated utility (15-18×) without an abrupt negative catalyst —at today's ~25×, any growth disappointment hits the multiple before it hits earnings—. Jurisdiction-by-jurisdiction regulatory execution (Georgia Power within its ROE band under base rates frozen through 2028, Alabama Power under Rate RSE, the natural gas cases in Illinois/Virginia), especially since prudence review has already disallowed expenses at Nicor Gas twice (US$58 million in 2023, US$63 million in 2025). And the direction of credit perception: Moody's revised Southern Company's outlook to negative in September 2025 and Fitch revised Georgia Power's from positive to stable in August 2025 — an early sign that the debt market is starting to look more cautiously at the construction program's leverage.