This article says that:
"A Technical Engineering Union official of CEB, Senior Engineering Assistant U.R.A. Senarathna alleges that the coal power plant frequently fails due to disruptive activities of the Chinese company that wants a long term maintenance contract of the power plant."
Well, this is a serious allegation, if true.
Good quality or poor quality equipment is a different issue altogether. But use of unfair practices is definitely something that should make the chinese worried.
They need to keep in mind that in democratic countries, information flow can't be controlled by authorities (what they are used to in PRC). On the better side, the manager of the power company can't be jailed or hanged, just because the plant failed to produce sufficient power.