Senai
Airport City

Senai Airport City (SAC) is a master-planned industrial and commercial township developed around Senai International Airport in Kulai, Johor. Spanning over 3,500 acres, it is the anchor development of the Johor-Singapore Special Economic Zone (JS-SEZ) — a landmark cross-border initiative that has accelerated infrastructure investment, workforce mobility, and multinational tenancy at a scale unseen in Malaysia since the 1990s.

The industrial precinct hosts a mix of aerospace MRO hangars, precision electronics assembly plants, high-throughput 3PL logistics hubs, and FMCG processing facilities. Factory footprints range from small SME units in the light industry clusters to large anchor facilities under one roof. This diversity of factory sizes means solar systems range from 100 kWp starter systems for smaller tenants up to systems approaching 1 MWp for large logistics warehouses (subject to the 1,000 kWac Solar ATAP cap and a capacity cap of 100% of MD).

Energy Profile: What Drives Electricity Bills at SAC

Most factories at SAC are billed under TNB's Medium Voltage General or Time of Use tariff (post-July 2025 Regulatory Period 4 rates). The maximum demand (MD) charge — currently RM 89.27 per kW per month on MV General (RM 97.06 on MV ToU) — is often the single largest line item on a factory bill, especially for E&E manufacturers with production line startups creating sharp demand spikes. For a 500-kW MD reading on MV General, that alone is RM 44,635 per month before a single kWh of energy consumption is counted.

Solar PV alone does not reliably reduce MD — one cloudy half-hour can set the month's peak — so MD reduction needs a BESS. When paired with a Battery Energy Storage System (BESS), factories can actively cap their MD reading.

GITA Eligibility for JS-SEZ Companies

The 60% Green Investment Tax Allowance (GITA) applies to qualifying solar PV capital expenditure where the system is commissioned and the application submitted to MGTC by 31 December 2026. JS-SEZ designation does not disqualify a company from GITA; confirm how GITA interacts with other incentives with your tax adviser. We prepare the full MGTC GITA (Asset) application documentation and supporting energy audit packs for SAC projects we bid on.

For an illustrative 500 kWp system at RM 1.2M capex (RM2,400/kWp before SST), the 60% GITA delivers RM 720,000 in tax allowance — worth up to RM 172,800 at a 24% corporate tax rate if fully absorbed, shortening payback from about 6.4 years to about 5.5 years.

Starting Your SAC Solar Project

An SAC solar proposal starts with our satellite roof analysis and TNB bill model. We combine 12 months of actual utility bill data with high-resolution roof mapping to produce a yield estimate. If you are at feasibility stage, our online savings calculator gives an indicative output.

Trexon Energy offers EPC (Engineering, Procurement, Construction) for commercial and industrial systems. Our factory solar solutions page covers the full installation process, from structural engineering and CAAM notification handling to the Solar ATAP application and commissioning with TNB. For Johor-based procurement teams, see our Johor Bahru solar page or contact us for a site discussion.