Nagato was equipped with four Gihon geared steam turbines, each of which drove one propeller shaft.
The turbines were designed to produce a total of 80,000 shaft horsepower (60,000 kW), using steam provided by 21 Kampon water-tube boilers; 15 of these were oil-fired while the remaining half-dozen consumed a mixture of coal and oil.
The ship could carry 1,600 long tons (1,600 t) of coal and 3,400 long tons (3,500 t) of fuel oil, giving her a range of 5,500 nautical miles (10,200 km; 6,300 mi) at a speed of 16 knots (30 km/h; 18 mph).
The ship exceeded her designed speed of 26.5 knots (49.1 km/h; 30.5 mph) during her sea trials, reaching 26.7 knots (49.4 km/h; 30.7 mph) at 85,500 shp (63,800 kW).

Funnel smoke would often choke and blind crewmen on the bridge and in the fire-control systems so a "fingernail"-shaped deflector was installed on the fore funnel in 1922 to direct the exhaust away from them.
It was less than effective and the fore funnel was rebuilt in a serpentine shape in an unsuccessful effort during a refit in 1924.
That funnel was eliminated during the ship's 1930s reconstruction when all of her boilers were replaced by ten oil-fired Kampon boilers, which had a working pressure of 22 kg/cm² (2,157 kPa; 313 psi) and temperature of 300 °C (572 °F).
In addition her turbines were replaced by lighter, more modern, units.
When Nagato conducted her post-reconstruction trials, she reached a speed of 24.98 knots (46.26 km/h; 28.75 mph) with 82,300 shp (61,400 kW).
Additional fuel oil was stored in the bottoms of the newly added torpedo bulges, which increased her capacity to 5,560 long tons (5,650 t) and thus her range to 8,560 nmi (15,850 km; 9,850 mi) at 16 knots.
Nagato was equipped with four Gihon geared steam turbines, each of which drove one propeller shaft. The turbines were designed to produce a total of 80,000 shaft horsepower (60,000 kW), using steam provided by 21 Kampon water-tube boilers; 15 of these were oil-fired while the remaining half-dozen consumed a mixture of coal and oil. The ship could carry 1,600 long tons (1,600 t) of coal and 3,400 long tons (3,500 t) of fuel oil, giving her a range of 5,500 nautical miles (10,200 km; 6,300 mi) at a speed of 16 knots (30 km/h; 18 mph). The ship exceeded her designed speed of 26.5 knots (49.1 km/h; 30.5 mph) during her sea trials, reaching 26.7 knots (49.4 km/h; 30.7 mph) at 85,500 shp (63,800 kW).
Funnel smoke would often choke and blind crewmen on the bridge and in the fire-control systems so a "fingernail"-shaped deflector was installed on the fore funnel in 1922 to direct the exhaust away from them. It was less than effective and the fore funnel was rebuilt in a serpentine shape in an unsuccessful effort during a refit in 1924. That funnel was eliminated during the ship's 1930s reconstruction when all of her boilers were replaced by ten oil-fired Kampon boilers, which had a working pressure of 22 kg/cm² (2,157 kPa; 313 psi) and temperature of 300 °C (572 °F). In addition her turbines were replaced by lighter, more modern, units. When Nagato conducted her post-reconstruction trials, she reached a speed of 24.98 knots (46.26 km/h; 28.75 mph) with 82,300 shp (61,400 kW). Additional fuel oil was stored in the bottoms of the newly added torpedo bulges, which increased her capacity to 5,560 long tons (5,650 t) and thus her range to 8,560 nmi (15,850 km; 9,850 mi) at 16 knots.
Japanese battleship Nagato