Loading NuWatt Energy...
We use your location to provide localized solar offers and incentives.
We serve MA, NH, CT, RI, ME, VT, NJ, PA, and TX
Loading NuWatt Energy...
Review the preliminary layout with a commercial solar specialist. We’ll confirm roof condition, structural requirements, utility service, and the next feasibility steps.
Analyze a commercial roofDemand charges account for 30-50% of commercial electricity bills. Battery storage systems with intelligent peak shaving algorithms can reduce peak demand by 30-50%, delivering 3-5 year payback on demand charge savings alone.
20-40%
Demand Reduction
3-5 Years
Payback Period
30-50%
ITC Eligible
15-20 Years
Battery Life
Commercial battery peak shaving typically saves 20-40% on demand charges, translating to $5,000-$24,000 annually depending on facility size and utility rates. A 100 kWh battery system costs $50,000-$80,000 before the Section 48/48E ITC (30-50%). With demand charge savings plus demand response program payments (National Grid's ConnectedSolutions pays $200/kW for a Massachusetts business battery; Rhode Island Energy pays $225/kW on its small-business track), most systems achieve 3-5 year payback.
Enter the numbers from your own utility bill to model your facility.
Both Massachusetts utilities publish the same $200/kW daily-dispatch rate — National Grid calls it Daily Dispatch, Eversource calls it daily curtailment — so this figure does not depend on which utility bills the meter. Where they differ is below 50 kW: National Grid pays $275/kW to batteries with inverter capacity under 50 kW and Eversource publishes no small-battery tier, so a small system earns more in National Grid territory. This calculator models the daily-dispatch rate of $200/kW, which is the default commercial enrolment at both.
From your bill (highest 15-minute kW).
From your utility tariff or bill. Example shown — enter your own.
Capped at 40% — real-world peak shaving rarely exceeds this without oversizing the battery.
Peak reduction
50 kW
25% of 200 kW peak
Annual demand-charge savings
$9,000
50 kW × $15/kW-mo × 12
Annual DR revenue
$10,000
50 kW dispatch × $200/kW-yr — Daily dispatch — National Grid Daily Dispatch and Eversource daily curtailment, both at the same rate
Net cost after ITC (30%)
$45,500
$65,000 − $19,500 ITC
Simple payback
2.4 yrs
demand savings + DR revenue
10-year net value
$144,500
cumulative savings + DR − net cost
Estimates only, built entirely from the values you enter — confirm against your utility tariff and a tax professional. Demand-charge savings use your billed peak demand, your demand rate, and your expected peak-shaving fraction. Demand-response revenue uses published ConnectedSolutions program incentive rates (Daily dispatch — National Grid Daily Dispatch and Eversource daily curtailment, both at the same rate) and requires enrollment plus dispatch participation; actual payments depend on your dispatched performance and are capped here at the capacity your entered battery energy can sustain. Massachusetts and Rhode Island publish different ConnectedSolutions rates for business batteries, and this calculator keeps them separate. The federal ITC (30% base plus site-specific adders) applies to the battery cost; tax-exempt entities use elective (Direct) Pay.
Commercial electricity bills have two distinct components that many business owners confuse. Understanding the difference is essential for optimizing solar + battery investments.
Charges for the total electricity consumed during the billing period. If you use 50,000 kWh at $0.15/kWh, the energy charge is $7,500. Solar panels directly reduce energy charges by offsetting consumption.
Typically 50-70% of the total bill for most commercial customers.
Charges based on your highest 15-minute average power draw during the billing period. Even one brief spike (starting up a compressor, EV fleet charging) sets your demand charge for the entire month.
Can represent 30-50% of the total bill. One 15-minute spike = 30 days of charges.
The Demand Ratchet Trap
Many utilities apply a "demand ratchet" — your demand charge is based on the higher of (a) your current month's peak demand or (b) 60-80% of your highest peak demand from the past 11 months. One bad month can inflate your demand charges for nearly a year. Battery peak shaving prevents these costly spikes.
Solar alone reduces demand charges somewhat by offsetting daytime grid draw. But clouds, early morning peaks, and late afternoon loads can still create demand spikes. Battery storage fills these gaps with guaranteed peak reduction.
Battery sizing depends on your peak demand level, load profile shape, and target demand reduction. The table below provides starting points for three common commercial facility sizes.
| Peak Demand | Battery Size | Peak Reduction | Monthly Savings | Annual Savings | System Cost | Payback | Best For |
|---|---|---|---|---|---|---|---|
| 50 kW | 50 kWh / 25 kW | 15-25 kW | $225-$500 | $2,700-$6,000 | $25,000-$40,000 | 4-8 years | Small retail, offices |
| 100 kW | 100 kWh / 50 kW | 30-50 kW | $450-$1,000 | $5,400-$12,000 | $50,000-$80,000 | 4-7 years | Warehouses, schools |
| 200 kW | 200 kWh / 100 kW | 60-100 kW | $900-$2,000 | $10,800-$24,000 | $100,000-$160,000 | 3-5 years | Manufacturing, distribution |
Costs are pre-ITC installed prices. Battery costs vary by chemistry (LFP vs NMC), manufacturer, and installation complexity. Savings assume $15/kW average demand rate.
Demand charge rates vary significantly by utility. Higher demand rates mean faster ROI for battery peak shaving. New England utilities consistently have the highest demand rates in the country.
| State | Utility | Demand Rate | Energy Rate | Notes |
|---|---|---|---|---|
| MA | Eversource | $16.73/kW | $0.227/kWh | Summer rates 20% higher |
| CT | Eversource CT | $15.89/kW | $0.221/kWh | Energy Storage Solutions eligible |
| RI | RI Energy | $14.50/kW | $0.212/kWh | ConnectedSolutions small-business track $225/kW (up to 50 kW) |
| NH | Eversource NH | $12.85/kW | $0.198/kWh | Peak: June-Sept |
| NJ | PSE&G | $11.20/kW | $0.146/kWh | Demand ratchet applies |
| ME | CMP | $10.50/kW | $0.176/kWh | No battery DR program |
| VT | GMP | $11.75/kW | $0.185/kWh | Battery storage incentives |
| PA | PECO | $8.90/kW | $0.112/kWh | TOU rates available |
| TX | Oncor | $9.50/kW | $0.098/kWh | ERCOT 4CP methodology |
Solar and battery storage are powerful individually, but together they create a synergy that maximizes commercial electricity savings across all bill components.
Solar panels offset kWh consumption during daylight hours, directly cutting the energy charge component. A 100 kW system producing 140,000 kWh/year saves $15,000-$32,000 in energy charges depending on the utility rate.
Battery storage monitors real-time demand and discharges to prevent peaks. This reduces the demand charge component by 20-40%, saving $5,000-$24,000 annually. The battery fills the gap when clouds reduce solar output.
During peak solar production (10am-2pm), excess generation charges the battery for free. The battery then discharges during late afternoon demand peaks (3pm-7pm) when solar output declines but energy prices peak on TOU rates.
When solar and battery are installed together, both qualify for the same Section 48/48E ITC (30-50%). This significantly reduces the effective cost of adding battery storage to a solar project vs. installing battery standalone.
100 kW Solar Only
100 kW Solar + 100 kWh Battery
Example assumes Massachusetts commercial demand rates. DR program = ConnectedSolutions at National Grid's published Daily Dispatch rate of $200/kW for 25 kW of enrolled battery capacity dispatched during summer peaks. Eversource publishes no statewide commercial battery rate, so its territory cannot be modelled on a programme figure.
The economics of commercial battery storage have shifted dramatically. Three factors converge to make 2026 the best year to invest:
LFP (lithium iron phosphate) commercial batteries now cost $400-$600/kWh installed, down from $700-$1,000/kWh in 2023. This price decline makes standalone demand charge reduction economically viable even without solar pairing.
Energy storage technology is its own qualifying category under Section 48E(c)(2). There is no requirement that a commercial battery be paired with solar or charged from a renewable source to claim the credit. Batteries used to need a solar host to qualify. With domestic content and energy community bonuses, the effective credit can reach 50%.
Energy storage technology is not subject to the December 31, 2027 placed-in-service deadline or the July 4, 2026 begin-construction trigger — both apply to applicable wind and solar facilities only, and Section 48E(e)(4)(C) expressly excepts energy storage technology (IRS Notice 2025-42, section 2.02). A standalone commercial battery keeps the 30% Section 48E credit under the standard clean-electricity phase-out, which starts at the later of 2032 or when U.S. greenhouse gas emissions from electricity are 25% of 2022 emissions or lower.
One caveat travels with this: the OBBBA prohibited-foreign-entity and material-assistance rules do apply to storage for construction beginning after December 31, 2025 (IRS Notice 2026-15). Component sourcing has to be documented at procurement, not at filing.
ConnectedSolutions is not one rate. In Massachusetts, National Grid pays a business battery $200/kW per summer season on Daily Dispatch (30-60 events of 2-3 hours across June through September) and $275/kW to batteries under 50 kW. In Rhode Island, RI Energy pays $225/kW on its Residential & Small Business track for systems up to 50kW; it does not publish a rate for its larger C&I pathway. Connecticut's Energy Storage Solutions pays commercial performance incentives of $275-$325/kW in years 1-5 (plus $175/kW in years 6-10). A 50 kW Massachusetts battery on Daily Dispatch earns $10,000 a year — on top of demand charge savings. This additional revenue stream can cut payback by 1-2 years.
For detailed information about how the ITC applies to battery storage projects, see our commercial solar tax credit guide. For the full program map across Massachusetts, Connecticut, Rhode Island and Texas alongside sizing and federal treatment, see commercial battery storage, or model your own numbers in the storage revenue stack calculator.
Demand charge rates are sourced from published commercial rate schedules for the primary utility in each state (general service rates, demand metered). Battery storage costs reflect Q1 2026 market pricing for LFP commercial systems (100-500 kWh range) including installation, commissioning, and monitoring.
Peak shaving savings estimates assume a standard commercial load profile with peak demand occurring during business hours (8am-6pm). Actual savings vary based on load profile shape, demand coincidence, and utility-specific demand measurement methodology (15-minute intervals for most utilities, 4CP for ERCOT in Texas).
ITC rates reference Section 48/48E as amended by the IRA (2022) and OBBBA (2025). ConnectedSolutions rates are based on published 2025-2026 program tariffs for Eversource and National Grid commercial customers in MA and RI. Connecticut's commercial battery incentive is the separate Energy Storage Solutions (ESS) program.
Last updated: July 2026
Commercial battery systems typically reduce demand charges by 20-40%, depending on load profile and battery sizing. A facility with a 100 kW peak demand can reduce measured peak to 50-70 kW by discharging the battery during demand spikes. At $15/kW demand rates, this saves $450-$750 per month or $5,400-$9,000 annually.
Our commercial team will analyze your utility bills, load profile, and demand patterns to recommend the optimal battery size and configuration.