 Although hydroelectric power has often been billed as a sustainable green energy source, continued sustainability relies on developing better ways of supporting nature, fish habitat and fundamental ecological services.The need to work in partnership with nature and be more responsive to a changing climate led in 2007 to $3.5 million in improvements and repairs, including replacement of the old plywood flashboards with a more reliable metal and rubber-bladder washboard structure (for better flood and water level control), as well as improving fish migration.In 2008 repairs were delayed by exceptionally heavy rains which highlighted the necessity of the repairs.