Well, Spain is. But take it from the Eco-Imagineers, the Nanny State is not going to let go of its monopolies without another tax… carrots, beans and tomato tax, water harvesting tax, sunshine tax…

The Spanish government is planning to tax homes that produce their own energy through solar power and store some of it using batteries.

Amounts due will discourage use of new devices such as the Tesla Powerwall battery.

Only off-grid consumers will be able to use batteries without being penalized.

A draft decree prepared by the Industry, Energy and Tourism Ministry establishes a new fee to discourage the use of batteries or other storage systems by people who produce electricity, with solar or photovoltaic panels for instance, and who are connected to the national power grid.

Only off-grid consumers may use batteries without being charged

http://elpais.com/elpais/2015/06/09/inenglish/1433860560_474648.html