The device has a wave (or swell) pump to pump sea water to a hilltop.It USES the energy of the water in which it floats to pump the stored potential energy.

该设备有一个波浪泵(膨胀泵)能将海水泵送到高处，它利用波浪的能力产生泵送的动力，并将波浪能转化为位能。

youdao

The device has a wave (or swell) pump to pump sea water to a hilltop. It USES the energy of the water in which it floats to pump the stored potential energy.

该设备有一个波浪泵(膨胀泵)能将海水泵送到高处，它利用波浪的能力产生泵送的动力，并将波浪能转化为位能。

youdao

The pump storage hydro scheme is designed to "soak up" excess power generated by wind and wave farms, using it to pump water up to a reservoir.

BBC: Highland councillors support Lochaber hydro plan

He has also worked on wave-powered dynamo which he claimed could produce enough energy to pump and collect water for hydroelectric turbine.

CNN: Lucien Gambarota: Alternative energy pioneer