Time-of-Use (TOU) Rates Are Coming to Commercial Customers: How to Profit Instead of Panic

The electricity pricing system that served commercial businesses for the better part of a century — flat or near-flat volumetric rates that charged the same price for electricity regardless of when you consumed it — is being systematically replaced. The replacement is time-of-use (TOU) pricing: a rate structure that charges significantly more for electricity consumed during peak demand periods and significantly less during off-peak hours.

For some commercial businesses, mandatory TOU enrollment is already here. For others, it's coming within the next 12-36 months as state utility commissions execute their grid modernization mandates. The direction is clear and the pace is accelerating — driven by federal clean energy policy, state-level renewable integration requirements, and the genuine need to send accurate price signals to commercial customers whose load patterns increasingly determine grid stability and cost.

Here's the thing about TOU rates that most businesses miss when they first hear about the change: TOU rates create winners and losers, and whether you end up in which category is almost entirely within your control. Businesses that operate primarily during off-peak hours will see their electricity bills decrease under TOU. Businesses that operate heavily during peak hours but can shift some of that load will capture savings from intelligent operational adjustments. And businesses that invest in battery storage and smart controls can effectively arbitrage the TOU price differential — buying cheap off-peak power and using it when peak prices would otherwise apply.

The businesses that get hurt by TOU rates are those that do nothing. This guide makes sure that's not your company.

Why Utilities Are Rolling Out Mandatory TOU for C&I Accounts

The Policy Drivers

Three forces are converging to make TOU rates for commercial customers an inevitability rather than an option:

Renewable integration requirements: As solar and wind generation compose larger shares of electricity supply, the grid faces a fundamental mismatch: renewable generation peaks in the middle of the day (solar) or overnight (wind), while commercial electricity demand peaks in the late afternoon. TOU rates that make afternoon electricity expensive and midday/overnight electricity cheap create price signals that encourage commercial load to shift — solving the integration problem through market mechanisms rather than mandates.

FERC Order 2222 and state grid modernization plans: Federal and state regulators have committed to modernizing grid price signals. TOU rates are a core component of that modernization agenda.

Smart meter penetration: Real-time TOU billing is only possible when utilities can read interval data. With smart meter penetration now exceeding 70% nationally for commercial accounts in major service territories, the technical barrier to TOU deployment has largely fallen.

Who's Already Rolling Out TOU

California: CPUC has implemented mandatory TOU for commercial accounts above certain demand thresholds across PG&E, SCE, and SDG&E. Commercial customers above 200 kW average demand in many territories are already on TOU tariffs.

Illinois (ComEd): ComEd's Hourly Pricing program and evolving TOU tariffs under the Climate and Equitable Jobs Act (CEJA) mandates are expanding mandatory TOU enrollment for C&I customers in stages through 2027.

New York (Con Edison): Con Edison's mandatory TOU programs for commercial accounts in NYC and Westchester have been expanding under NY PSC rate orders.

New England (Eversource, National Grid): Multiple programs in progress; Massachusetts and Connecticut leading mandatory C&I TOU expansion.

Texas (Oncor, CenterPoint): While ERCOT's competitive retail market means TOU is primarily delivered through competitive retail providers rather than mandated utility tariffs, TOU products from retail suppliers are proliferating rapidly.

Understanding time-of-use pricing for commercial buildings in the context of your specific utility and state regulatory environment provides the local detail that this national overview can only sketch.

Reading a TOU Tariff: Peak, Mid-Peak, Off-Peak, Critical Peak

TOU tariffs divide the day, week, and sometimes season into distinct pricing periods. Knowing how your specific tariff is structured is prerequisite to managing it.

Standard TOU Period Definitions

On-Peak (Peak): The hours when electricity demand and pricing are at their highest. Typically:

Weekdays: 2 PM - 9 PM (varies by utility; some end at 8 PM or 7 PM)
Summer may be longer peak windows than winter
Examples: ComEd Peak = 2-7 PM weekdays; Con Edison = 8 AM-6 PM weekdays

Mid-Peak: Some tariffs include an intermediate pricing tier between on-peak and off-peak. Less common than straightforward two-tier (peak/off-peak) structures.

Off-Peak: The hours when electricity is cheapest — when demand is low and renewable generation is often abundant.

Typically: 9 PM - 2 PM (overnight and late morning)
Weekends and holidays are off-peak in most commercial TOU tariffs

Critical Peak Pricing (CPP) / Emergency TOU: Some tariffs include a "critical peak" tier that applies on designated days (typically 10-15 per summer) when grid stress is highest. Critical peak rates can be 5-10x the standard on-peak rate. CPP events are typically declared 24 hours in advance, allowing commercial customers to prepare.

Price Differentials by Tariff

The financial stakes of TOU pricing depend on the magnitude of the peak vs. off-peak price spread:

Utility	Peak Rate (est.)	Off-Peak Rate (est.)	Peak Premium
ComEd (IL) TOU	$0.18-0.22/kWh	$0.05-0.08/kWh	3-4x
Con Edison (NY) TOU	$0.20-0.28/kWh	$0.07-0.10/kWh	3-4x
PG&E (CA) TOU	$0.35-0.50/kWh	$0.15-0.20/kWh	2.5-3x
Oncor (TX) via retail	$0.12-0.25/kWh	$0.04-0.07/kWh	3-6x

Note: Rates are illustrative 2026 ranges; actual rates vary by specific tariff, voltage level, and demand threshold

For a commercial facility consuming 100,000 kWh/month with 40% of consumption during on-peak hours, the difference between unoptimized (high peak consumption) and optimized (low peak consumption) billing can be $3,000-$8,000/month depending on the specific utility's tariff.

Understanding your bill in the context of TOU will be important — revisiting understanding your commercial electric bill with TOU lens is recommended when your tariff changes.

Operational Shifts and Automation That Convert TOU Risk Into Savings

The most accessible and fastest-payback TOU optimization strategies don't require capital investment — they require operational discipline and intelligent scheduling.

HVAC Pre-Cooling: The Highest-Impact No-Cost Strategy

Commercial buildings' biggest electricity draw is typically HVAC. The thermal mass of a commercial building provides a natural "battery" — you can cool the building earlier in the day (during off-peak hours) to a lower temperature, then allow it to warm slightly during on-peak hours while maintaining comfort, reducing HVAC load during the most expensive period.

How pre-cooling works:

Set HVAC to begin cooling 1-2 hours earlier than normal, targeting a supply air temperature 1-2°F cooler than standard setpoint
During on-peak hours (2-9 PM), raise the occupied setpoint by 1-2°F — occupants typically don't notice the difference
HVAC runs at lower capacity during peak hours while the thermal mass of the building slowly warms toward the slightly higher setpoint
After peak hours end, resume normal cooling as needed

Savings potential: For a 200,000 sf office building, HVAC pre-cooling can shift 20-30% of afternoon HVAC load to off-peak periods — saving $1,500-$3,000/month depending on the TOU rate spread.

Equipment Scheduling: Shift Flexible Loads to Off-Peak

Any equipment that doesn't need to run continuously during peak hours is a TOU optimization opportunity:

Batch manufacturing processes: Production runs that can be scheduled overnight or on weekends receive off-peak electricity rates. A food manufacturer that can run its dryers from 10 PM to 6 AM instead of 2 PM to 10 PM may save $0.10-0.15/kWh on that production.

Commercial laundry and dishwashing: Hospitals, hotels, restaurants with high-volume dishwashing and laundry can schedule these loads to avoid peak windows.

Water heating: Commercial water heaters with large storage capacity can be heated during off-peak hours and maintain temperature through peak periods without significant reheating.

Compressor and refrigeration: Refrigeration systems can be set to cool more aggressively during off-peak hours, then maintain temperature with minimal compressor run time during peak hours.

EV fleet charging: Shift all EV fleet charging to overnight off-peak windows. Under a TOU tariff with a 3-4x peak-to-off-peak price differential, this single scheduling change can reduce EV charging cost by 60-70% compared to afternoon peak charging.

Building Automation System (BAS) TOU Integration

The most reliable way to implement TOU optimization at scale is through your building automation system. Modern BAS platforms can be programmed to:

Follow TOU pricing calendars automatically (pre-loaded with on-peak/off-peak schedule)
Execute pre-cooling protocols without manual intervention
Manage plug loads and non-critical systems during peak events
Respond to utility CPP event notifications automatically

For facilities without a TOU-aware BAS, smart energy management systems from companies like AutoGrid, Itron, EnerNOC (Enel), and others provide overlay capabilities that add TOU response intelligence to existing HVAC and equipment controls.

Your commercial load profile — specifically what percentage of your consumption occurs during peak vs. off-peak hours — is the key input for quantifying how much TOU optimization is possible for your facility.

BESS, Solar, and Smart Controls for TOU Optimization

For facilities with higher TOU exposure, operational scheduling may not be sufficient to fully optimize TOU economics. Technology investments — particularly battery storage — provide automated, around-the-clock TOU arbitrage that doesn't depend on operational scheduling.

Battery Storage as TOU Arbitrage Engine

Battery storage is the most powerful TOU optimization technology for commercial buildings. The core mechanism:

Off-peak charging: Battery charges from the grid during overnight off-peak hours at the lowest TOU rate (e.g., $0.05/kWh)
Peak discharge: Battery discharges during on-peak hours (2-9 PM), offsetting facility consumption of expensive peak electricity (e.g., $0.20/kWh)
Net savings per cycle: $0.15/kWh spread × battery capacity in kWh = daily savings

BESS TOU arbitrage example:

200 kWh battery system, cycling once per day on weekdays
Price spread: $0.18/kWh (off-peak $0.05, on-peak $0.23)
Daily savings: 200 kWh × $0.18 = $36/day
Annual arbitrage savings (250 weekdays): $9,000/year

This $9,000/year in arbitrage value stacks on top of the demand charge reduction savings discussed earlier. For a battery system costing $80,000 (200 kWh × $400/kWh) with 30% ITC:

Net cost: $56,000
Annual savings (arbitrage + demand reduction): $15,000-$25,000
Payback: 2.2-3.7 years

Solar PV + Battery: The Ideal TOU Configuration

On-site solar generation aligns particularly well with TOU rate structures in markets with afternoon peak periods. Here's why:

The misalignment problem: Solar panels generate maximum output at midday (11 AM - 2 PM), before the typical 2-9 PM peak pricing window. Without storage, solar generation mainly displaces off-peak or mid-peak electricity purchases — capturing less of the available TOU savings.

The battery solution: Add battery storage to capture excess midday solar generation, then discharge it during the 2-9 PM peak window. Now solar + storage captures the maximum TOU savings: solar generates cheaply, battery stores and deploys during peak hours.

Combined system value:

Solar reduces annual energy cost through net metering/billing
Battery times the solar energy to maximize TOU savings
Combined system eligible for 30% ITC on both solar and storage components

Smart Controls for Critical Peak Response

For utilities with Critical Peak Pricing (CPP) events, the speed and accuracy of your response matters enormously. A $0.50/kWh critical peak rate applying for 4 hours means every 100 kW of load you shed saves $200 per event — and CPP events typically occur 10-15 days per summer.

Smart controls options:

BAS integration with CPP calendar: Utility publishes CPP event days 24 hours ahead; BAS executes pre-programmed load shed protocol automatically
IoT demand response platforms: Third-party platforms (Nest for Business, EnerNOC, GridPoint) receive utility CPP signals and dispatch load shedding across enrolled assets
Aggregator enrollment: Third-party aggregators manage CPP response and earn utility incentive payments on your behalf

The intersection of TOU optimization and advanced contract structures creates interesting opportunities: businesses that can demonstrate TOU responsiveness may access supply contracts with favorable TOU-aware pricing.

Conclusion

Time-of-use rates are not a threat to be avoided — they're a price signal to be responded to. Commercial businesses that recognize this reality and build operational and technology responses to TOU pricing will see lower electricity costs under TOU than under the flat-rate tariffs they're replacing. Businesses that do nothing will see higher costs.

The response framework is clear: start with no-cost operational scheduling changes (HVAC pre-cooling, load shifting), assess BAS demand management automation for your facility, evaluate battery storage as a TOU arbitrage investment, and consider solar + storage for the most comprehensive optimization.

The most important first step is understanding your current facility's load profile in the context of your specific utility's TOU tariff: what percentage of your consumption falls in peak hours? What's the price differential? What are the highest-leverage shifts available to you? That analysis frames everything else.

Commercial Energy Advisors helps commercial clients understand their TOU exposure, model the economics of operational and technology responses, and structure supply contracts that complement TOU tariff optimization.

Call 833-264-7776 or contact us today for a free TOU rate analysis for your commercial facility.

Frequently Asked Questions

What is a time-of-use (TOU) rate for commercial electricity?

A TOU rate charges different prices for electricity based on when it's consumed — higher rates during peak demand periods (typically weekday afternoons) and lower rates during off-peak periods (nights, weekends). The goal is to incentivize commercial customers to shift flexible load away from peak hours, reducing stress on the grid.

Are mandatory TOU rates coming for commercial businesses?

Yes, in most US utility territories. California has already implemented mandatory TOU for larger commercial accounts; Illinois, New York, and New England states are in various stages of mandatory C&I TOU expansion. The direction is clear nationally, driven by renewable integration requirements and state grid modernization mandates.

How much more expensive is peak vs. off-peak electricity under TOU?

Typical commercial TOU tariffs feature peak rates 2-4x higher than off-peak rates. Critical Peak Pricing (CPP) events can reach 5-10x the standard off-peak rate. The magnitude varies by utility and specific tariff.

What is pre-cooling and how does it reduce TOU costs?

Pre-cooling is an HVAC scheduling strategy that cools the building to a lower temperature before peak pricing begins, then allows the building to warm slightly during peak hours while relying on thermal mass to maintain comfort. This shifts HVAC load from expensive peak hours to cheaper off-peak hours without compromising building comfort.

Can battery storage eliminate TOU peak charges?

A properly sized battery storage system can significantly reduce on-peak electricity purchases by charging from the grid during off-peak hours and discharging during peak periods. Complete elimination is rarely achieved, but reductions of 50-80% of peak consumption are achievable with appropriately sized systems.

Does on-site solar help with TOU rates?

On-site solar is most effective for TOU optimization when paired with battery storage. Solar generation typically peaks at midday, before the afternoon on-peak window. Battery storage captures midday solar and deploys it during the peak hours when electricity is most expensive, maximizing TOU savings from the combined system.

How do I know if my commercial facility is on a TOU tariff?

Check your electricity bill for multiple pricing periods listed (on-peak, off-peak) or for charges varying by time of day. If you're on a single flat volumetric rate, you're likely still on a non-TOU tariff — but contact your utility to confirm whether your account is scheduled for mandatory TOU conversion.

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