World’s first solar powered houseboat sets a world record The Mothership has just become the first boat to travel the entire 150km down the Hawkesbury River using only solar power. The Hawkesbury river is long and tidal. Tides can run at over 4 knots in some places. A trip of this nature needed to be planned to make best use of the tidal flow. The upper reaches are gentile. After Wisemans Ferry the river becomes more of a wilderness and it is rare to see another person.