109,500 gallons of diesel/year is ~$265,100/year[1]. 1.4 Megawatts (5328 solar panels) is from ~$4.3M to ~$7M[2]. 60 Tesla Powerpacks (6 Megawatts/hour) is ~$

109,500 gallons of diesel/year is ~$265,100/year[1]. 1.4 Megawatts (5328 solar panels) is from ~$4.3M to ~$7M[2]. 60 Tesla Powerpacks (6 Megawatts/hour) is ~$8.7M[3] So it's at worst a 50 year bet (if gallon's price doesn't increase) which is pretty good for a reliable continuous source of power. [1]: https://www.wolframalpha.com/input/?i=how+much+is+109,500+gallons+of+diesel https://www.wolframalpha.com/input/?i=how+much+is+109,500+ga... [2]: http://www.freecleansolar.com/What-is-the-price-cost-for-a-SolarCity-PV-system-s/4620.htm http://www.freecleansolar.com/What-is-the-price-cost-for-a-S... [3]: https://en.wikipedia.org/wiki/Tesla_Powerwall https://en.wikipedia.org/wiki/Tesla_Powerwall