An interesting initiative by Eneco in the Netherlands, by subsidising Powerwall installation and providing a 450 euro annual payment to participating households in return for access to 30% capacity and dispatch control. It's a nice simple proposition, though perhaps with a limited window in which to be appealing. Whilst the proposition is appealing on the face of it, it could disguise the degree to which the homeowner is unable to benefit from the full potential of the Powerwall for the house's own load shifting, and also the exent to which there are soon likely to be more lucrative ways in which domestic battery owners can make money from participating in aggregation schemes providing balancing or capacity services.
That said, it's a great idea, and hopefully generates some good uptake, as well as some useful datasets!
An estimated 400,000 homes in The Netherlands already have solar panels installed. Eneco is offering those homes discounted Tesla Powerwalls — €4,500 euro installed, instead of €7,000 — in an effort to build a "virtual power plant" of 400 networked batteries. The power can then be tapped as reserve capacity to help national grid providers cope with constant fluctuations on grid load, reserves usually provided by environmentally unfriendly sources like gas- or coal-fired power plants.