Wikipedia
The States-Provincial (in Dutch: Provinciale Staten, abbreviated PS – commonly known as simply the Staten) is the provincial parliament and legislative assembly in each of the provinces of the Netherlands. It is elected for each province simultaneously once every four years and has the responsibility for matters of sub-national or regional importance. Each States-Provincial is directly elected by the electors within the relevant province, and the number of seats in each States-Provincial is proportional to its population.
The States-Provincial originated as Estates assemblies in the Middle Ages, hence the name. From 1813 to 1850 the noble members of the ridderschap chose one third of the members of States-Provincial. Johan Rudolf Thorbecke's reforms and his "Provinces Law" ("provinciewet") of 1850 brought this privilege to an end.
The States-Provincial choose the Gedeputeerde Staten as the executive organ of the province. Originally, the States-Provincial themselves had also executive powers and chose the Gedeputeerde Staten from their own members for daily governance. On 11 March 2003, the two institutions split; in other words, there was a change from fusion of powers to separation of powers. The principal roles of the States-Provincial have become to set general policies, represent the people, approve provincial legislation and the annual budget and to oversee the executive. Both the Gedeputeerde Staten and the States-Provincial are presided over by the King's Commissioner in the province, appointed by the Crown every 6 years.
The last provincial elections were held 18 March 2015.
Three months after their election the combined members of the States-Provincial elect the members of the Senate of the States-General of the Netherlands.