CASTLE ROCK RD
WALNUT CREEK, CA
Based on surrounding parcels, Castle Rock Rd in Walnut Creek, CA 94598 is a low-density residential and A2 agricultural-zoned corridor featuring large-lot single-family homes and equestrian/ranch properties. No significant commercial energy load is expected; typical residential utility demand applies.
Projected savings.
Year 1
$76,300
Lifetime (~30 yr)
$5,692,000
By the numbers.
3.9
Years to payback
$13.5M
Total benefits (lifetime)
$7.8M
Property value gain
$622,197
Tax incentives captured
Levelized cost of electricity
Like most WALNUT CREEK businesses, the site was paying high Peak rates and large Demand charges — the kind of bill structure that punishes daytime energy use and penalizes the very hours commercial properties consume the most power. The result was a Levelized Cost Of Energy (LCOE) of $1.15/kWh from PG&E, reduced to $0.06/kWh from SolarPorts.
SolarPorts evaluated their interval power usage (every 15 minutes) and proposed a right-sized 105 kW solar system for on-site generation delivered as 7 SolarPort carport structures above the parking lot.
The system now produces roughly 164,640 AC kWh of clean energy each year, an estimated $76,300 in year-one utility offsets, and around $5,692,000 in net lifetime savings — turning a recurring operating-cost into a long-term, predictable energy hedge.
System spec
System design
- Site
- CASTLE ROCK RD
WALNUT CREEK, CA 94598 - APN
- 138270002
- Utility
- PG&E
- Seismic rating
- 1.6
- Irradiance
- 2
- System size
- 105.0 kW DC
- Estimated production
- 164,640 AC kWh / year
- Year-1 utility offset
- $76,300
- Lifetime savings (~30 yr)
- $5,692,000
- Solar panels
- 210 × Trina 480 BiFacial
- SolarPort structures
- 7
- Wire loss
- 2.0%
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