Couple things to keep in mind though...
Many of these tax credits and incentives disappear if making improvements on a second/vacation home. Not 100% sure on the alternative power options but doing improvements such as energy star rated appliance, windows, insulation, even alternative heat sources aren't necessarily available or if they are do not offer the same amount of credits.
To truly be off the grid requires very expensive storage. Using the existing grid is typical but that does not free you from the monthly expenses of being attached to it, so to suggest you wipe out your energy bill sort of a dubious statement, yes maybe you eliminate the actual cost of electricity but there is still a bill you got to pay if you remain connected to the grid. If you manage to generate more than you consume I have read that additional power is not necessarily credited back to you, or if it is the amount is capped and quite small.
Got to do your homework on this.
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