Shares in listed utility companies fell sharply on Friday, with National Grid PLC (LSE:NG.), United Utilities Group PLC (LSE:UU.), Severn Trent PLC (LSE:SVT) and SSE PLC (LSE:SSE) each declining between 4% and 5%, as a confluence of domestic political instability and global inflationary pressures drove gilt yields to levels not seen in decades.
The moves reflect the sector's acute sensitivity to interest rates. Utility stocks, prized by income investors for their stable and predictable dividend streams, lose relative appeal when government bond yields rise, offering comparable returns without the equity risk.
The 10-year gilt yield climbed to 5.142% on Friday, while 30-year borrowing costs touched their highest levels since the late 1990s earlier in the week.
Two forces are driving the yield surge. At home, the resignation of Health Secretary Wes Streeting and the announcement by Greater Manchester Mayor Andy Burnham that he intends to contest the Makerfield by-election, a move widely interpreted as the opening gambit in a Labour leadership challenge against Sir Keir Starmer, has unsettled sovereign debt markets already sensitive to questions of fiscal credibility.
Internationally, stalling US-Iran peace negotiations have kept oil prices above $100 a barrel, feeding inflationary pressure that has manifested in hotter-than-expected readings on both the US consumer and producer price indices this week. Markets are now pricing a roughly 45% probability of a Federal Reserve rate increase, double the level implied just days ago.