The Four Ways Solar Energy Gets Stored or Used
When your solar panels produce electricity, it doesn't disappear if you're not immediately using it. There are four possible destinations for solar energy, and most homeowners use a combination of options 1 and 2:
| Destination | How It Works | Cost | Backup Power? |
|---|---|---|---|
| 1. Immediate use | Powers your home in real-time as panels produce | $0 extra | N/A |
| 2. Grid export (net metering) | Excess flows to grid, earns bill credits | $0 extra | No |
| 3. Home battery storage | Stored in Powerwall/Enphase for night use | $8,000–$14,000 | Yes |
| 4. Thermal storage | Heats water or thermal mass for later use | $1,000–$4,000 | Limited |
Option 1: Net Metering — The Grid as Your Free Battery
For homeowners without battery storage, net metering is how excess solar energy gets "stored." When your panels produce more than your home uses — common on sunny weekday mornings when you're at work — the surplus flows to the utility grid. Your electric meter runs backward, accumulating credits. At night or on cloudy days, you draw from the grid and spend those credits.
Net metering is available in most US states and effectively turns the grid into a free, unlimited battery. The key limitation: it doesn't provide power during grid outages. If the grid goes down, your solar system also shuts off for safety (unless you have a battery or special inverter).
| State | Net Metering Policy | Export Rate | Battery Needed? |
|---|---|---|---|
| Most US states | Full retail NEM | ~$0.135/kWh | Optional |
| California (NEM 3.0) | Avoided cost rate | ~$0.05/kWh | Near essential |
| Nevada | Partial retail | ~$0.09/kWh | Recommended |
| Hawaii | Limited/self-supply | Minimal export | Essential |
Option 2: Home Battery Storage — The Best 2026 Options
Battery storage lets you capture excess daytime solar production and use it at night, during peak rate periods, or during grid outages. The residential battery market has matured significantly — 2026 offers reliable, cost-competitive options from multiple manufacturers.
| Battery | Capacity | Power Output | Gross Cost | After 30% ITC | Warranty |
|---|---|---|---|---|---|
| Tesla Powerwall 3 | 13.5 kWh | 11.5 kW peak | $11,500–$13,500 | $8,050–$9,450 | 10 years |
| Enphase IQ Battery 5P | 5 kWh/module | 3.84 kW/module | $4,500–$5,500 | $3,150–$3,850 | 15 years |
| Franklin aPower 2.0 | 13.6 kWh | 10 kW peak | $10,500–$12,500 | $7,350–$8,750 | 12 years |
| SunPower SunVault | 13 kWh | 8 kW peak | $12,000–$14,000 | $8,400–$9,800 | 10 years |
How Much Solar Energy Can a Battery Store?
Battery capacity is measured in kWh. To understand what that means practically, consider average home loads:
| Appliance | Wattage | Hours/Day | Daily kWh |
|---|---|---|---|
| Refrigerator | 150W | 24 | 1.2 kWh |
| LED lighting (10 bulbs) | 100W | 8 | 0.8 kWh |
| Phone/laptop charging | 100W | 4 | 0.4 kWh |
| TV | 120W | 4 | 0.5 kWh |
| Wi-Fi router | 10W | 24 | 0.24 kWh |
| Essential loads total | ~480W avg | 24 | ~3.1 kWh/day |
A single Tesla Powerwall 3 (13.5 kWh) covers essential loads for about 4 days — or a full home for 12–18 hours. Two Powerwalls (27 kWh) handles whole-home backup for 24–48 hours through most grid outages.
Virtual Power Plants: A New Way to Store and Share Solar Energy
An emerging storage model is the Virtual Power Plant (VPP) — networks of home batteries that collectively store and discharge energy to stabilize the grid. Tesla Energy Plan, Enphase Network, and utility-run VPP programs pay homeowners $100–$500/year for allowing the utility to occasionally draw from their home battery during peak demand.
VPPs transform your battery from a purely personal resilience tool into a grid asset that generates income — improving the financial case for battery storage beyond just self-consumption savings.