Here’s an interactive map of the European electrical grid from ENTSO-E, the European Network of Transmission System Operators for Electricity.
This map is a comprehensive illustration of the transmission system network operated by members of the European Network of Transmission System Operators.
In general the map shows all transmission lines designed for 220kV voltage and higher and generation stations with net generation capacity of more than 100MW.
Maps of the grid are also available as downloadable PDFs. [Maps on the Web]