For industrial factory owners, "electricity" is often one of the biggest production costs eating into profit. With the Ft charge fluctuating in 2026, factory solar has become unavoidable — and the good news is you may not have to pay the full installation cost

Many people have heard that "install solar, get BOI support and cut costs by 50%." How true is it, what conditions are hidden, and what has changed this year? This article lays out the numbers to show how much the "real price" after incentives speeds up a factory's payback

BOI solar for factories 2026 — does it really cut costs?

Does the BOI really pay 50%?

First, understand that "cut costs by 50%" in BOI terms doesn't mean the government hands back half in cash the moment you buy. It comes as a "Corporate Income Tax Exemption"

Under the measure to upgrade industry for energy savings, the BOI lets factories that install solar for self-consumption deduct the investment from their taxes, subject to these main conditions

  • Benefit: 3-year corporate income tax exemption
  • Exemption cap: up to 50% of the investment (excluding land and working capital)
  • Key 2026 condition: since mid-2025 the BOI has become stricter, favoring projects that use advanced technology or are installed with energy storage (BESS) or smart energy management, in line with Grid Modernization

In short

Suppose your factory already pays tax on its profits every year. Instead of paying the full amount to the Revenue Department, you can use that money to "pay yourself back" for the solar installation — effectively the government covers 50% of the installation through the tax system

The numbers: factory solar with BOI vs. without BOI

To make it as clear as possible, let's compare a mid-sized factory installing a 500 kWp system, assuming: