If downsizing your main breaker is not an option, and if your utility will not allow a supply-side tap, you may need to upgrade your main electrical panel with one with more capacity. Upgrading your main electrical panel can be costly, as it is labor-intensive and can add complexity to an installation.
If your new electrical panel requires that you upsize the conductors feeding it (the cables going from the utility pole into your main service meter), this can add significantly to the cost. This is especially true if the cables are buried underground, as opposed to having them come overhead (over the air) into a mast on the roof. Having to replace cables that are buried underground requires that you dig up the old cables and install bigger ones, and the length and depth of the trench can vary widely for each home; upsizing buried conductors is generally not recommended.
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