Ukraine's biggest energy provider is living in permanent crisis mode because of Russian attacks on the grid, its chief executive has told the BBC. Most of Ukraine is suffering from lengthy power cuts as temperatures drop and Maxim Timchenko, whose company DTEK provides power for 5.6 million Ukrainians, says the intensity of strikes has been so frequent 'we just don't have time to recover'. President Volodymyr Zelensky stated that Russia knew winter cold could become one of its most dangerous weapons, emphasizing that Ukrainian families are forced to endure nights in basements hoping air defenses will hold. As the fourth anniversary of Russia's full-scale invasion approaches, Timchenko detailed that DTEK's energy grid has faced waves of drone, cruise, and ballistic missile attacks, complicating recovery efforts. Reports indicate that tens of thousands of residents in Odesa were left without power for three days due to a coordinated assault. Despite these hardships, the spirit of support among residents remains strong, with many offering help to those without power. Currently, approximately 50% of Ukraine's energy is supplied by large nuclear power plants, but the transfer network is significantly damaged; DTEK continues to face challenges in sourcing spare parts for repairs. The company has spent $166 million in an effort to withstand the ongoing onslaught. Timchenko remarked, 'We will not give up,' affirming a commitment to provide electricity and heating to millions of Ukrainians.