but do you see any realistic way to tackle this apart from raising base service fees?

Hard agree on re-nationalizing a natural monopoly (bloody neoliberal bullshit), which is itself a realistic way. Beyond that investigate microgrids, redundancy (especially EV batteries), making large users pay for their own infrastructure and preferably renewable generation (Aluminium smelters, AI Datacentres, or say no to AI). Battery uptake should be taking pressure off the grid and making it cheaper, but here we are.