It seems to be an investment in underground distribution structures and advanced monitoring including predictive failure analysis.

However there's kind of a funny part to it that I read on the last page of New Scientist some years ago. According to that story, Singapore has by far the lowest rate of accidental line cuts - it's a step change to almost zero from the next best country. Apparently there's a worldwide organization that meets to discuss these things. At one meeting the Singaporean engineers presentation was eagerly anticipated but as he was going through his points the engineers from other countries were impatient - they know and do all this! Until he got to his final point: accidental line cuts in Singapore result in 10-year prison sentence. Hence the difference.