The AbbasHamas "unity" government, claiming a "right-of-resistance" has now officially demonstrated to the world through its spokesman what this "right" means -- shooting an Israeli electric company worker on Israeli soil as an official act of Hamas. Israel now unambiguously has the right under International law and UN Charter #51 to cut off from Gaza the supply of Israeli electricity -- and should do so. They can not be compelled to further risk their citizens lives to provide Gaza a service they didn't have prior to 1967, and thus are not lawfully entitled to in the first place. Obviously, the same holds true for water supply, fuel and access to Israel's ports, also provided only after 1967. No "collective punishment", its not Gaza's right to begin with. 100% sqeeky-clean legal.
from the article: Egypt says would-be Hamas suicide bomber arrested near Israeli border