In 1923 Bergenshalvøens Kommunale Kraftselskap (BKK) expropriated large areas for power plants and development of hydropower started soon afterwards. Dale power station with the two first aggregates, each of 14 MW was put into operation on 17 November 1927. In the supply reservoir in Storefossen 5152 cubic metres of concrete were cast, and a modern and well-equipped power station was built.
In Ålvik quartz has long been used to produce ferro-silicon. The quartz was collected from the other side of the fjord, from the mountainside above Kvalvikane.
Jondal has one of the country’s oldest slate quarries. Roof tiles have been extracted here since the end of the 1700s, but the quarry is much older. Kvernurdi is mentioned in a diploma in 1421, when Bård Sigurdsson at Torsnes became the owner through a settlement. Already then it must have been customary to cut millstones here.