Editing Cross-flow turbine (section)

==Advantages==
The peak efficiency of a cross-flow turbine is somewhat less than a [[Kaplan turbine|Kaplan]], [[Francis turbine|Francis]] or [[Pelton wheel|Pelton]] turbine. However, the cross-flow turbine has a flat efficiency curve under varying load. With a split runner and turbine chamber, the turbine maintains its efficiency while the flow and load vary from 1/6 to the maximum. 

Since it has a low price, and good regulation, cross-flow turbines are mostly used in mini and [[micro hydro]]power units of less than one thousand [[KW#Kilowatt|kW]] and with heads less than {{cvt|200|m}}.

Particularly with small [[run-of-the-river hydroelectricity|run-of-the-river plants]], the flat efficiency curve yields better annual performance than other turbine systems, as small [[river]]s' water is usually lower in some months. The efficiency of a turbine determines whether [[electricity]] is produced during the periods when rivers have low flows. If the turbines used have high peak efficiencies, but behave poorly at partial load, less annual performance is obtained than with turbines that have a flat efficiency curve. 

Due to its excellent behaviour with partial loads, the cross-flow turbine is well-suited to unattended electricity production. Its simple construction makes it easier to maintain than other turbine types; only two [[bearing (mechanical)|bearings]] must be maintained, and there are only three rotating elements. The mechanical system is simple, so repairs can be performed by local mechanics.

Another advantage is that it can often clean itself. As the water leaves the runner, leaves, grass etc. will not remain in the runner, preventing losses. Therefore, although the turbine's efficiency is somewhat lower, it is more reliable than other types. No runner cleaning is normally necessary, e.g. by flow inversion or variations of the speed. Other turbine types are clogged more easily, and consequently face power losses despite higher nominal efficiencies.