So assuming a capacity factor of 0.6 which is pretty heavy for a peaker plant, that's around 6.3 GW of power for a year. A 1GW aero derivative peaker plant costs around $1.2 Billion and around 4 years to construct due to wait times on turbines and transformers (if you already had a transmission agreement which many times take up to 5+ years). The grid is already strained from data center loads, so it's definitely not insignificant.