01 — The Savings Story
Two levers, one bill.
Solar and battery work together to maximize facility savings. The battery banks excess solar energy that would otherwise be curtailed, then uses that energy for late afternoon peak shaving.
1
Solar Capture
Opting for a load displacement solar system can result in a 40% capital discount on solar project costs. Sponge ensures the battery is ready to capture excess solar that would otherwise be curtailed. Result: $24,549 saved a year — a 41.4% drop in energy costs.
2
Peak Shaving
Sponge strategically discharges the battery to cap the site's monthly peak, adapting its target based on weather and the demands of the ESI program. This reduces BC Hydro's per-kW monthly demand charge. Result: $14,728 saved a year — a 43.8% drop in demand costs.
Real dispatch behavior from the Sponge Battery Proposal Studio — solar production (orange) charges the battery, which discharges to offset load (teal) through the evening peak.
Where The $36,152 In Annual Savings Comes From
$24,549 · Solar Capture
Energy line, down 41.4%
$14,728 · Peak Shaving
Demand line, down 43.8%
Together, the two levers cut $36,152 from the annual utility bill — a 38.9% reduction.
The Bill, Before And After
$93,014
Baseline Annual Utility Cost
$56,861
Refined Annual Utility Cost
$36,152
Total Annual Savings · 38.9%
