Convert Horsepower-Hours to Gigawatt-Hours
Convert Horsepower-Hours (hp·h) to Gigawatt-Hours (GWh) instantly and accurately.
Conversion Formula
GWh = hp·h × 7.456998716e-7
About Horsepower-Hours
A horsepower-hour (hp·h) is the energy from one mechanical horsepower (745.6999 W) for one hour - exactly 2,684,519.54 J ≈ 2.685 MJ. James Watt coined the horsepower to compare his steam engines with mine horses; billing in hp·h preceded the kilowatt-hour tariff. The metric horsepower (PS = 75 kgf·m/s = 735.499 W) gives a slightly smaller metric-hp·h = 2,647,795 J, used in European and Japanese engine datasheets. Today the hp·h appears in marine engineering logs, mining energy accounting, and vintage industrial equipment. 1 hp·h = 2.6845 MJ = 0.74570 kWh = 641.19 kcal.
About Gigawatt-Hours
A gigawatt-hour (GWh) is the energy from 1 GW for one hour - exactly 3.6 TJ. National electricity generation is reported in annual GWh: Ireland ~32,000 GWh/year; France ~496,000 GWh/year. The Hornsea One offshore wind farm (1.12 GW) generates ~4,000 GWh/year. The Bath County Pumped Storage (3 GW, USA) stores ~24 GWh. World total battery storage capacity reached ~1,600 GWh by end-2022. Energy of 1 megaton TNT ≈ 1.162 GWh. 1 GWh = 3.6 TJ = 1,000 MWh = 3.412 × 10⁹ BTU.
Quick Reference Table
| Horsepower-Hours (hp·h) | Gigawatt-Hours (GWh) |
|---|---|
| 1 hp·h | 7.457 × 10-7 GWh |
| 2 hp·h | 1.491 × 10-6 GWh |
| 5 hp·h | 3.728 × 10-6 GWh |
| 10 hp·h | 7.457 × 10-6 GWh |
| 25 hp·h | 1.864 × 10-5 GWh |
| 50 hp·h | 3.728 × 10-5 GWh |
| 100 hp·h | 7.457 × 10-5 GWh |