Why TCO Analysis Matters More Than Purchase Price
Procurement decisions based on purchase price alone consistently underestimate the true cost of grid-powered decorative lighting. The purchase price of a grid pole is visible; the electricity bill, maintenance labour, cable-trench cost, and grid outage losses are distributed across years and often not attributed to the lighting project in post-installation accounting. TCO analysis makes all costs visible and comparable.
TCO Model Assumptions
| Parameter | Value Used | Basis |
|---|---|---|
| LED wattage | 30W | Typical decorative pole for colony / village road |
| Operating hours | 10 hrs/night | Dusk to dawn, Maharashtra average |
| Days per year | 365 | Full year operation |
| Electricity tariff (grid) | Rs 10/kWh | Maharashtra LT public lighting tariff 2025-26 |
| Cable trench distance | 25m per pole | Average pole spacing, single-side layout |
| Trench cost | Rs 250/metre | Moderate soil, Maharashtra average |
Year-by-Year Cost Breakdown
| Year | Solar Pole (Cumulative) | Grid Electric Pole (Cumulative) |
|---|---|---|
| Year 0 (purchase + install) | Rs 45,000 | Rs 26,250 |
| Year 2 | Rs 46,000 | Rs 29,850 |
| Year 4 | Rs 47,000 | Rs 33,450 |
| Year 5 (LED replacement grid) | Rs 47,500 | Rs 37,750 |
| Year 7 | Rs 48,500 | Rs 41,350 |
| Year 9 (solar battery replacement) | Rs 57,500 | Rs 44,950 |
| Year 10 (final total) | Rs 58,000 | Rs 50,700 |
Scenarios Where Solar Wins Clearly
| Scenario | Impact on Grid TCO | Solar Advantage |
|---|---|---|
| Electricity tariff Rs 12/kWh | Grid 10-yr rises to Rs 56,550 | Solar cheaper by year 8 |
| Cable trench cost Rs 400/metre | Grid install cost rises Rs 3,750/pole | Solar cheaper from year 5 |
| 3 hr/day grid outage | Effective coverage hours reduced | Solar wins on reliability alone |
| Remote location (1km+ grid extension) | Grid connection cost Rs 80,000-2,00,000+ | Solar wins decisively |
| MNRE subsidy eligible | Solar purchase cost reduced 30-40% | Break-even year 3-4 |
Frequently Asked Questions
At what electricity tariff does solar become clearly cheaper than grid?
In our standard model (30W pole, 10 hrs/day, Rs 250/m trench cost), solar becomes clearly cheaper over 10 years when the electricity tariff exceeds Rs 11/kWh. Maharashtra LT public lighting tariff is approximately Rs 10/kWh and has increased by Rs 1-1.5/kWh every 2 years.
Does the battery replacement cost make solar less attractive?
Battery replacement at year 8-10 costs Rs 5,000-12,000 per pole. This is typically offset by accumulated electricity savings before that point. LiFePO4 batteries rated for 2,000+ cycles last 8-10 years before replacement.
Can I get a government subsidy on solar decorative poles?
Yes, for eligible projects. Gram panchayat and ULB projects using MNRE-approved solar products may be eligible for 30-40% capital subsidy. This changes the TCO calculation significantly — making solar cheaper from year 3-4 in most scenarios.
