2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53018We show in this note that the Padmanabhan expression $E = a/2$ for the energy of the Schwarzschild and de Sitter spacetimes (a - the horizon radius) is also valid for the Rindler horizon, using an analogy with the electrostatic case.5 pages, references added, no figuresHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext