Sure you can. The datacentre builders just don't want the (fairly modest) extra expense to do so properly. Obviously some preparatory work is required before dumping a lot of extra capacity into the grid.

My state allowed the power utilities to charge a modest fee ($10,000 to $100,000, depending on project size) before a yet-to-be-built data centre could demand a large amount of electricity. The amount of planned data centres went down by an order of magnitude. The truth is that most of the data centre builders (not all) do not want to be responsible citizens and are simply extracting value and wealth from other people, including from the power utilities and grid operators.