Climate Change & Conservation 

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All Fuel Consumption Costing

Public Utility Service & Fossil Fuel Use - We use zero non-renewable power from fossil fuels.

Fossil Fuel Monthly Cost *Note
Electricity $ 0 ( Zero ) Solar, investment amortized over 20 years
Natural Gas $ 0 ( Zero ) Electrical ( solar ) radiant slab heating and hot water: costlier than natural gas but less polluting or hazardous, and defrayed by PV solar generation
Gasoline & Oil $ 0 ( Zero ) Two electric vehicles (EV) 100% charged by electricity generated by solar panels on the house
Water $ 0 ( Zero ) Rainwater, pumps powered by solar
* Excludes fixed cost charges, e.g. meters, storm drains, wastewater, etc.

Representative Household Electrical Consumption & Cost - Represents the average annual power consumption of our major appliances. Obviously power consumption fluctuates according to family size1 and season, winter or summer.

  Per Month
Major Appliance or Set Average Kwh2 Billing @ $.11/Kwh
( Palo Alto Utilities )
Radiant Heating Electric Boiler3003 $ 44
EV battery recharging @ 19 Kwh/vehicle200$ 80
Tankless Water Heater175$ 19
Shower/bath @ 1.5 Kwh x 2/day90 $ 10
CPUs & Printers48$ 6
Routers36$ 4
Pumps: 2 Submersible, 1 Sump75$ 8
Dishwashing Hot Water @ 1.2 Kwh/day30$ 4
Stovetop30$ 4
Washer + Dryer25$ 3
Bathroom Sinks @ .5 Kwh/day15$ 2
Refrigerator15$ 2
TV & DVR/VCR4$ 1
Miscellaneous Small Appliances ( Est. ): Stereo, Setback Thermostat, Outdoor lighting, Oven, Irrigation controller, Lights, Coffee pot, Toaster, Hair dryer, Toothbrushes 30$ 4

Notes:
  1. Assumes typical usage for 2-person, conserving family
  2. Numbers are rounded, and do not add, due to duplication, e.g. Tankless Water Heater supplies hot water for a range of applications
  3. Season's heating leveled as an annual average over a year's use [ Boiler operates for no more than 6 months a year on the SF Peninsula ]
  4. Sharply reduced phantom power with powerstrips

Automotive Costs

Automobile MPG Fuel Cost Comparisons - Contrast fuel consumption per 100 miles and 600 miles monthly between electric vehicles (EV) and an average gasoline-powered sedan @ 30 mpg ( Gas price @ $4/gallon ). Trucks and SUVs would have lower mpg. Adjust the gasoline mileage accordingly.

Fuel Consumption Fuel Price @ average $ 4 per gallon
  Two EVs @ 200 MPG ( Nominal ) Combustion Engine @ 30 MPG
100 miles $ 2.50 $ 12.50
600 miles/month $ 30 $ 80

* "Nominal" 200 mpg: 100 miles @ $2/gallon = 200 mpg when gasoline costs $4 per gallon.

EV Operating Costs - The two 100% electric cars are charged from an ordinary 115 volt outlet, though a dedicated 220 Volt outlet can be installed for fast charging. With our limited use the EVs can be charged overnight. A full charge requires 17 hours at 115 volts. Minimal maintenance required, except for brakes, rotating or new tires, changing windshield wipers, etc.

Gas & Oil $ 0 ( Zero ) 2-3 times/week charge @ 115V, solar-powered household outlet
Maintenance $ 0 ( Zero ) Tires, windshield wipers
Smog & Regulation $ 0 ( Zero )  

Note: "Costs" ignore, e.g., environmental cost savings from zero tailpipe emissions.