re: Price per kw conspiculously abaent
Unfortunately, the opposing group's website is in Dutch, so I don't know their specific objections, or exactly what they mean by "other energy sources." Solar isn't exactly a strong point in a small nation in that climate. For all I know, the group is pro-nuclear.
Right now the Netherlands gets most of its energy from oil and natural gas. Could be worse--the Netherlands is also the second-largest producer of natural gas in the EU, and is a net exporter. They do import oil.
Details here. I believe many of these numbers include all uses, like transportation.