Hydroponic Electricity Costs 2026 | Calculator & Guide

A countertop herb unit draws about as much power as a phone charger. A serious 600W HPS tent costs nearly $400 a year to run at average US rates. Those two facts live at opposite ends of the same hobby — and knowing where your setup lands before you buy anything is the difference between a pleasant surprise and a utility bill you weren't expecting.

## Quick Reference: Monthly Running Costs

Based on 16 hours light, 24 hours fans/pump, $0.12/kWh national average

The honest truth: A small herb garden costs less than a Netflix subscription to run. Larger setups have real running costs, but they also produce significant quantities of food.

## US Electricity Rates

The national average is approximately $0.12 per kWh, but this varies enormously by state: - Cheapest: Louisiana ~$0.08, Oklahoma ~$0.09, Idaho ~$0.09 - Mid-range: Texas ~$0.12, Ohio ~$0.11, Florida ~$0.12 - Expensive: California ~$0.22, Connecticut ~$0.23, Massachusetts ~$0.25 - Most expensive: Hawaii ~$0.33

Check your utility bill for your actual rate. The numbers above use the national average.

The formula: Watts x hours per day x days / 1000 x rate = cost

Example: 200W light x 16 hours x 30 days / 1000 x $0.12 = $11.52 per month

## LED vs HPS: The Real Cost Comparison

400W LED setup: - Light purchase: Around $350 - Coverage: 4'x4' - Monthly electricity: Around $23 - Annual electricity: Around $276 - 3-year total: Around $350 + $828 = $1,178

600W HPS setup: - Light purchase: Around $100 - Coverage: 4'x4' (similar light output) - Monthly electricity: Around $29 (light only) - Annual electricity: Around $348 - Plus extraction for heat: Add $100/year - 3-year total: Around $100 + $1,344 = $1,444

The math is clear: LED costs more upfront but saves around $90-150 per year. Break-even typically happens within 12-18 months.

## Is It Worth It?

Small herb garden: Running cost around $1.50-7 per month. You'll harvest $25-60 worth of fresh herbs monthly. Clearly economic.

Medium vegetable setup: Running cost around $13-20 per month. Monthly harvest varies but typically $60-120 worth of produce.

The real value: Economics aside, fresh lettuce picked 30 seconds before eating is different from grocery store lettuce picked days ago.

Our [grow lights roundup](/guides/best-grow-lights-us) covers the best options at each price point.

Take our quiz for setup recommendations that balance your goals with realistic running costs.

The economics of indoor growing are better than most people expect at the small end, and more demanding than most expect at the large end. A countertop herb garden pays for itself within a few months. A full 4x4 tent is a genuine commitment — know your actual running costs before you buy equipment. That calculation, done honestly, is what makes the difference between a rewarding hobby and an expensive lesson.

## Complete Running Costs by Setup Size

The real question isn't the headline wattage of your light — it's the total system draw including fans, pumps, and other equipment.

Small herb setup: - 100W LED: actual draw ~100W - 4" fan: ~25W - Small pump (if applicable): ~5W - Total: ~130W - Running 16 hours light + 24 hours fan: ~2.7 kWh/day → $10-12/month at US average rates

Mid-size vegetable setup: - 200W LED: actual draw ~200W - 4" inline fan: ~50W - Air pumps (DWC): ~15W - Timer-controlled accessories: ~10W - Total: ~275W - Running 18 hours light + 24 hours fan: ~6.4 kWh/day → $23-28/month at US average rates

Serious growing setup (4'x4' tent): - 400W LED: actual draw ~400W - 6" inline fan: ~80W - Air pumps and pumps: ~30W - Miscellaneous: ~20W - Total: ~530W - Running 18 hours light + 24 hours fan: ~12.2 kWh/day → $44-53/month at US average rates

## State-by-State Rate Guide

US electricity rates vary more than most people realize. Your actual costs depend significantly on where you live:

Check your utility bill for your actual rate — most show both the rate and total kWh consumed.

## Time-of-Use Rates

Many US utilities now offer Time-of-Use (TOU) pricing with lower rates during off-peak hours (typically late night through early morning). This creates an opportunity for grow light scheduling.

If your utility has TOU rates: - Set your grow light timer for off-peak hours (e.g., 10pm-2pm) - This gives plants their required light hours while maximizing off-peak electricity - Savings of 20-40% are achievable in TOU markets

Check with your utility company about TOU programs. Programs vary by state and provider.

## LED Efficiency: What Actually Matters

Marketing wattage is misleading. The number that matters is actual wall draw (the power your meter measures) and PPE (Photosynthetic Photon Efficacy — how much usable light you get per watt).

Quality LEDs (Spider Farmer, AC Infinity, Mars Hydro): 2.5-3.0 µmol/J efficiency Budget LEDs: 1.5-2.0 µmol/J efficiency Old-style HPS: 1.5-1.7 µmol/J efficiency

Higher efficiency means the same electricity produces more plant-usable light. A 2.8 µmol/J LED grows plants faster per dollar of electricity than a 1.8 µmol/J LED.

## Energy Efficiency Measures

LED dimming: Most modern LED drivers are dimmable. Running at 75% power during vegetative growth saves electricity while providing adequate light for lettuce and herbs. Use full power only during flowering if you're growing fruiting plants.

Automation: Smart plugs with scheduling (Kasa, TP-Link) provide precise control. Some integrate with electricity price signals to automatically run during cheap hours.

Insulation: For basement or garage grows in cold climates, a well-insulated tent reduces heating requirements. Less supplemental heat means lower overall energy use.

## Comparing to Alternatives

Growing lights vs buying produce:

For a small 2-plant herb setup at $10-12/month electricity, you'd need to save $10-12/month in produce buying to break even on electricity alone. One regular basil purchaser easily achieves this.

For larger setups growing tomatoes or cucumbers, the economics improve further — those premium vegetables cost $4-8/pound at quality grocery stores.

LED vs HPS electricity comparison:

A 200W LED equivalent in HPS draws ~280-300W for similar output. At $0.12/kWh running 18 hours: LED costs $13/month vs HPS at $19/month. The 6$/month difference covers about 20% of the initial LED premium per year.

## Frequently Asked Questions

Will my electricity bill spike noticeably?

A small herb setup adds $10-15/month — noticeable but not dramatic. A full 4'x4' tent adds $40-55/month — significant, worth factoring into growing economics.

Is it worth calculating whether growing is "worth it" economically?

For herbs and premium produce that you buy regularly: usually yes, especially in high-cost states. For wholesale produce: usually no — the economics don't support it at small scale. Grow what you actually buy frequently.

Can you use solar panels to offset growing costs?

Theoretically yes, practically complicated. Solar panels with battery storage can power a grow room overnight, but the capital cost of the storage system typically doesn't pay back compared to grid electricity for hobby-scale growing.

Understanding your actual electricity costs lets you make smart decisions about which crops to grow (higher-value produce offsets costs better), how to time your lighting, and whether to invest in more efficient equipment. The numbers matter more in expensive electricity states than in low-cost states — a California grower's calculation looks very different from a Louisiana grower's.

## Complete Running Costs by Setup Size

The real question isn't the headline wattage of your light — it's the total system draw including fans, pumps, and other equipment.

Small herb setup: - 100W LED: actual draw ~100W - 4" fan: ~25W - Small pump (if applicable): ~5W - Total: ~130W - Running 16 hours light + 24 hours fan: ~2.7 kWh/day → $10-12/month at US average rates

Mid-size vegetable setup: - 200W LED: actual draw ~200W - 4" inline fan: ~50W - Air pumps (DWC): ~15W - Timer-controlled accessories: ~10W - Total: ~275W - Running 18 hours light + 24 hours fan: ~6.4 kWh/day → $23-28/month at US average rates

Serious growing setup (4'x4' tent): - 400W LED: actual draw ~400W - 6" inline fan: ~80W - Air pumps and pumps: ~30W - Miscellaneous: ~20W - Total: ~530W - Running 18 hours light + 24 hours fan: ~12.2 kWh/day → $44-53/month at US average rates

## State-by-State Rate Guide

US electricity rates vary more than most people realize. Your actual costs depend significantly on where you live:

Check your utility bill for your actual rate — most show both the rate and total kWh consumed.

## Time-of-Use Rates

Many US utilities now offer Time-of-Use (TOU) pricing with lower rates during off-peak hours (typically late night through early morning). This creates an opportunity for grow light scheduling.

If your utility has TOU rates: - Set your grow light timer for off-peak hours (e.g., 10pm-2pm) - This gives plants their required light hours while maximizing off-peak electricity - Savings of 20-40% are achievable in TOU markets

Check with your utility company about TOU programs. Programs vary by state and provider.

## LED Efficiency: What Actually Matters

Marketing wattage is misleading. The number that matters is actual wall draw (the power your meter measures) and PPE (Photosynthetic Photon Efficacy — how much usable light you get per watt).

Quality LEDs (Spider Farmer, AC Infinity, Mars Hydro): 2.5-3.0 µmol/J efficiency Budget LEDs: 1.5-2.0 µmol/J efficiency Old-style HPS: 1.5-1.7 µmol/J efficiency

Higher efficiency means the same electricity produces more plant-usable light. A 2.8 µmol/J LED grows plants faster per dollar of electricity than a 1.8 µmol/J LED.

## Energy Efficiency Measures

LED dimming: Most modern LED drivers are dimmable. Running at 75% power during vegetative growth saves electricity while providing adequate light for lettuce and herbs. Use full power only during flowering if you're growing fruiting plants.

Automation: Smart plugs with scheduling (Kasa, TP-Link) provide precise control. Some integrate with electricity price signals to automatically run during cheap hours.

Insulation: For basement or garage grows in cold climates, a well-insulated tent reduces heating requirements. Less supplemental heat means lower overall energy use.

## Comparing to Alternatives

Growing lights vs buying produce:

For a small 2-plant herb setup at $10-12/month electricity, you'd need to save $10-12/month in produce buying to break even on electricity alone. One regular basil purchaser easily achieves this.

For larger setups growing tomatoes or cucumbers, the economics improve further — those premium vegetables cost $4-8/pound at quality grocery stores.

LED vs HPS electricity comparison:

A 200W LED equivalent in HPS draws ~280-300W for similar output. At $0.12/kWh running 18 hours: LED costs $13/month vs HPS at $19/month. The 6$/month difference covers about 20% of the initial LED premium per year.

## Frequently Asked Questions

Will my electricity bill spike noticeably?

A small herb setup adds $10-15/month — noticeable but not dramatic. A full 4'x4' tent adds $40-55/month — significant, worth factoring into growing economics.

Is it worth calculating whether growing is "worth it" economically?

For herbs and premium produce that you buy regularly: usually yes, especially in high-cost states. For wholesale produce: usually no — the economics don't support it at small scale. Grow what you actually buy frequently.

Can you use solar panels to offset growing costs?

Theoretically yes, practically complicated. Solar panels with battery storage can power a grow room overnight, but the capital cost of the storage system typically doesn't pay back compared to grid electricity for hobby-scale growing.

Understanding your actual electricity costs lets you make smart decisions about which crops to grow (higher-value produce offsets costs better), how to time your lighting, and whether to invest in more efficient equipment. The numbers matter more in expensive electricity states than in low-cost states — a California grower's calculation looks very different from a Louisiana grower's.

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