它可以是一个有价值的补充，风能，太阳能和水电。
It can be a valuable supplement to wind, solar and hydropower.
在某些地区，水电项目是作为风力发电和太阳能发电项目的后备手段。
In some cases, hydropower is growing as a backup power supply for wind and solar power.
开发国内能源资源，尤其是水电、风电和太阳能等可再生能源资源，被认为是石油进口国的关键。
Development of domestic energy resources is deemed critical in oil-importing countries, notably renewable resources, such as hydro, wind and solar power.
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