Time-of-Use Tariff Optimization Services
If your plant is still scheduling production purely around output targets, you’re likely overpaying for power without realizing it. Time-of-Day (ToD) tariffs are now mandatory for commercial and industrial consumers with maximum demand of 10 kW and above, with peak-hour rates 10 to 20 percent higher than normal tariffs and solar-hour rates 10 to 20 percent lower. That’s not a minor adjustment, it means two identical units of electricity can cost meaningfully different amounts depending purely on when you draw them.
The stakes are real: industry consumed 40.39 percent of India’s total electricity in 2024-25, more than any other sector. States are also moving at different speeds and rates. Tamil Nadu’s industrial tariff is now around Rs 7.5/kWh for FY 2026, with a 25 percent peak-hour surcharge and a 5 percent rebate for night consumption, while Uttar Pradesh has held industrial rates between Rs 6.4-7.1/kVAh depending on voltage level. If you run facilities in more than one state, a single national strategy won’t work, you need a state-specific one.
This guide walks through what’s changing in 2026, where the real savings sit, and how to build a load-shifting program that won’t disrupt your production line. Time-of-Use Tariff Optimization Services help manufacturers turn this into a practical, engineering-led program rather than a spreadsheet exercise.
Why This Matters Right Now
1. ToD is no longer optional or pilot-stage.
It’s applied to every large industrial consumer, and states are actively debating stricter versions. Some regulators are proposing to replace older peak-load exemption charges with formal ToD tariffs, over industry objections that costs could rise sharply.
2. Tariffs are trending up, independent of wholesale prices.
- A Supreme Court order requiring state regulators to clear accumulated “regulatory assets” in a time-bound manner is expected to push electricity tariffs higher in several states through 2026,
- even though wholesale electricity prices actually fell 16 percent year-on-year in 2025. Don’t assume falling generation costs will show up on your bill ,they usually don’t, at least not immediately.
3. Smart metering is closing the loopholes.
- As of December 2025, only about 22 percent of approved smart meters were installed nationwide, with roughly 53 million installed by January 2026. That number is climbing fast: more than 5.4 crore smart meters were in place by early 2026 across all schemes, sanctioned for 45 utilities covering nearly 19.8 crore consumers.
- The Revamped Distribution Sector Scheme (RDSS) had a fixed sunset date of March 31, 2026 for new sanctions, which pushed a wave of rollout activity through early 2026. Practically, this means billing precision on peak-hour usage is only going to get sharper , the averaging that once softened your exposure is disappearing.
4. Regulation is actively being rewritten
- In February 2026, the Central Electricity Authority proposed draft amendments requiring Smart Meters (or equivalent) for all high-capacity consumers in areas with communication network coverage, updating rules that dated back to 2006.
- Separately, the Draft Electricity (Amendment) Bill and Draft National Electricity Policy, both 2026, propose phasing out cross-subsidy charges for manufacturing within five years of enactment ,a change that will directly reshape what industrial consumers pay relative to other categories.
Common Mistakes Manufacturers Make
- Scheduling around output only. Shift patterns and batch cycles are usually built for throughput, not tariff windows; retrofitting them without engineering input risks disrupting production.
- No interval-level visibility. Monthly aggregate bills hide exactly which loads are driving peak-hour cost. Without 15/30-minute data, you’re guessing.
- Ignoring auxiliary loads. Compressors, chillers, and cooling towers often run continuously regardless of the main line — and are frequently the easiest loads to shift.
- Treating ToD in isolation. Fixing peak-hour exposure while ignoring contracted demand and power factor penalties can just move cost from one line item to another.
- Assuming one state’s rules apply everywhere. Rebate percentages, peak windows, and thresholds differ by discom — a plan that saves money in one state can misfire in another.
Steps to Get This Right
1. Get interval-level load data. Pull 15/30-minute consumption from your meter (or request it from your discom) and map it against your applicable ToD schedule.
2. Check your actual tariff and contract terms. Confirm current rates, demand charges, and rebate windows directly against your state commission’s latest order — these change annually or more often.
3. Sort your loads by whether they can move. Continuous-process loads generally can’t shift; batch, auxiliary, and discretionary loads usually can.
4. Look at on-site generation or storage. Captive solar, rooftop solar, or battery storage can shave peak-hour draw , model the payback before committing capital.
5. Roll out in phases. Start with low-cost auxiliary rescheduling before moving to automation or capital projects, so production isn’t disrupted while you learn what works.
6. Keep monitoring. Track actual peak-hour consumption against targets and revisit the plan whenever your state commission issues a new tariff order.
Time-of-Use Tariff Optimization Framework
- Energy Audit & Load Profiling — Interval-level data collection across all major loads, cross-referenced against the facility’s applicable ToD tariff schedule and discom billing structure.
- Tariff & Contract Review — Detailed review of contracted demand, power factor terms, and ToD rate applicability, benchmarked against the latest state regulatory commission orders.
- Load-Shift Feasibility & Simulation — Engineering assessment of which loads can be rescheduled without affecting production output, supported by simulation of projected savings under different shift scenarios.
- Solution Design — Design of load-scheduling automation, captive solar/storage integration where viable, and utility system modifications (compressors, chillers, cooling towers) needed to support the shift.
- Implementation Support — On-ground coordination during rollout of scheduling changes, automation systems, and any generation/storage assets, with minimal disruption to ongoing production.
- Monitoring & Continuous Optimization — Post-implementation tracking of actual savings against projections, with periodic re-optimization as tariff orders and production patterns evolve.
The Time-of-Use Optimization Lifecycle
| Stage | Key Activities | IMARC’s Role | Business Outcome |
| Load Profiling | Interval data, peak/off-peak mapping | Data analysis | Clear cost visibility |
| Tariff Review | Contract & regulatory benchmarking | Commercial review | Accurate cost baseline |
| Feasibility | Load-shift scenario modeling | Engineering assessment | Validated savings |
| Solution Design | Automation, storage design | Technical specification | Actionable plan |
| Implementation | Scheduling & automation rollout | On-site coordination | Low-disruption execution |
| Monitoring | Ongoing tracking | Performance validation | Sustained savings |
Industry-Specific Considerations for Time-of-Use Optimization
- Chemicals & Petrochemicals — Continuous-process constraints limit shiftable load, so savings often come from batch operations, utility systems (cooling towers, compressors), and captive power integration rather than core process rescheduling.
- Pharmaceuticals & Life Sciences — Cleanroom HVAC and validated environmental controls cannot be interrupted, making ToD optimization dependent on auxiliary load shifting and demand-charge management rather than production-line changes.
- Food Processing & FMCG Manufacturing — Batch-based operations with cold storage and refrigeration loads offer meaningful shift potential, particularly for pre-cooling and thermal storage strategies timed to off-peak and solar hours.
- Metals, Cement & Heavy Engineering — High connected loads and significant demand charges make this segment among the most sensitive to ToD structures; furnace and kiln scheduling around peak windows can yield some of the largest absolute savings.
- Textiles & Automotive Manufacturing — Multi-shift operations with flexible production sequencing offer strong potential for shifting energy-intensive processes (dyeing, stamping, welding) into off-peak or solar-hour windows.
Consult IMARC Engineering for Time-of-Use Tariff Optimization: https://www.imarcengineering.com/contact?service=utility-cost-energy-efficiency-audits
Business Outcomes of Structured Time-of-Use Optimization
- Direct reduction in peak-hour energy charges through load rescheduling and demand management.
- Lower contracted demand penalties from better-aligned demand forecasting and load curve management.
- Improved power factor compliance, reducing penalty exposure alongside ToD savings.
- Reduced carbon intensity of consumption, supporting ESG and RE100-aligned reporting for export-facing manufacturers.
- Greater resilience to future tariff revisions, since a flexible, well-monitored load profile adapts more easily to regulatory changes than a fixed production schedule.
Time-of-Use Tariff Trends Shaping Indian Manufacturing in 2026
- Cross-subsidy phase-out for industrial consumers. The Draft National Electricity Policy 2026 proposes phasing out cross-subsidy for manufacturing industries within five years of enactment, expected to reshape the industrial tariff base over the coming years.
- Accelerating smart meter deployment. The Government of India aims to replace 250 million conventional meters by FY 2025-26, with around 47.6 million smart meters already installed and state-level proposals covering another 203.3 million meters, steadily expanding the granular billing infrastructure that makes ToD enforcement more precise.
- Regulatory asset liquidation pushing tariffs upward in some states. A September 2025 Supreme Court order directed state electricity regulators to liquidate regulatory assets in a time-bound manner, with the impact expected to unfold through 2026 in the form of higher electricity tariffs in some states.
- State-level variation persisting. Some states are actively debating replacing older peak-load exemption charge mechanisms with formal Time-of-Day tariffs, meaning manufacturers with multi-state operations need location-specific strategies rather than a single uniform approach.
- Growing overlap with renewable integration. Solar PV generation grew 24 percent year-on-year, reinforcing the value of aligning industrial load with solar-hour tariff windows as renewable capacity continues to expand
How IMARC Engineering Can Help
IMARC Engineering supports manufacturers with engineering-led Time-of-Use Tariff Optimization programmes, including load profiling, tariff analysis, demand-side management, energy audits, feasibility assessments for solar and battery integration, automation recommendations, and implementation support. Our team helps manufacturers reduce energy costs while maintaining production continuity and ensuring compliance with evolving state electricity regulations.
Conclusion
Time-of-Use tariff structures have moved from a regulatory pilot to a permanent feature of industrial power contracts across India. For manufacturing plants where energy is one of the largest controllable cost lines, treating ToD exposure as a fixed cost rather than a variable one leaves real savings unrealized every billing cycle. A structured, engineering-led approach , grounded in actual load data, feasible shift scenarios, and phased implementation , turns tariff volatility into a manageable, even predictable, part of plant operations.
Contact Us:
IMARC Engineering
Phone: +91-120-433-0800
Email: sales@imarcengineering.com
India: C-130, Sector 2, Noida, Uttar Pradesh 201301
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