Reducing Demand Charges with Solar + Battery Storage in NJ

For NJ commercial properties on rate schedules with significant demand charges, battery storage paired with solar can compound the economic case for solar alone. The math is specific to your facility — but for the right load profile, storage adds 2 to 4 years of additional positive cash flow over solar-alone.

What Are Demand Charges?

Commercial electric bills typically have two components: energy charges ($/kWh consumed) and demand charges ($/kW peak power drawn). For a NJ facility on PSE&G GLP rate schedule, demand charges typically run $18 to $25 per kW per month — meaning a 500 kW peak demand costs $9,000 to $12,500 per month in demand charges alone.

Demand charges are driven by your peak 15-minute power draw during the billing month, not your total energy use. A facility with sharp compressor restarts can have low average load but high peak demand — and high demand charges.

How Solar + Battery Reduces Demand Charges

Solar alone offsets energy charges (during daylight hours) but doesn’t reliably reduce peak demand — peaks often occur outside solar production hours. Battery storage can dispatch during peak demand windows, shaving the peak kW reading.

Sample math for a NJ warehouse on PSE&G GLP:

• Current peak demand: 480 kW
• Demand charge rate: $22/kW-month
• Demand portion of bill: $10,560/month = $126,720/year
• Battery sized to shave to 380 kW peak: 100 kW × 2 hr = 200 kWh battery
• Annual demand savings: ~$26,400
• Battery installed cost after NJESI: ~$200,000 to $280,000
• Simple payback (storage alone): 8 to 11 years
• Simple payback (solar + storage combined): often under 7 years

NJ Energy Storage Incentive (NJESI)

The NJ Energy Storage Incentive program provides upfront capacity-based incentive payments for paired solar + storage commercial systems. Typical incentive: $400 to $700 per kWh of battery capacity. For a 200 kWh battery, that’s $80,000 to $140,000 in upfront incentive — substantially reducing net battery cost.

NJESI program year has annual capacity caps and may pause when allocation is exhausted. Project timing matters for capturing the incentive.

Strong Fits for Storage

• Cold storage and food processing — 24/7 refrigeration with sharp compressor peaks
• Manufacturing with compressor cycling — strong demand peaks at shift changes
• Grocery distribution and pharmaceutical cold chain — high refrigeration loads
• Facilities on PSE&G GLP, GS-T, or similar high-demand-charge rate schedules

Weak Fits for Storage

• Pure warehousing with flat load and modest demand charges
• Office buildings with M-F daytime load — solar alone covers most value
• Small commercial under 50 kW peak demand
• Facilities on residential-equivalent block rates without demand components

Federal ITC for Paired Storage

The 30% federal ITC applies to batteries paired with solar AND charged at least 75% from solar. Standalone storage also became ITC-eligible under the IRA with different qualification rules. We structure projects to maximize ITC capture under the paired-storage rule.