When the upper level sits within the lower one, a two-storey E-House adds equipment rooms without enlarging the substation footprint. At a 35 kV substation in Ninghai, China, the eight modules ETENZ built for Sieyuan Electric hold 157.5 m² of equipment rooms on a 90 m² footprint.
The two-storey E-House at the 35 kV prefabricated substation in Shepantu, Ninghai County, is made up of eight modules: five on the lower level, 12 × 7.5 m overall, and three on the upper level, 9 × 7.5 m overall, with each level 3.6 m high. Its four equipment rooms total 157.5 m². Because the upper level stands within the outline of the lower one, the E-House occupies only the lower level's 12 × 7.5 m, or 90 m². ETENZ manufactured the E-House for Sieyuan Electric and delivered it to site in October 2026; the modules have been joined on site and equipment commissioning is under way.
The lower level holds the 35 kV switchgear room (7.5 × 4.8 m) and the 10 kV switchgear room (7.5 × 7.2 m). Switchgear is heavy and carries many incoming and outgoing cables, so it stays at ground level. The upper level holds the protection and control room (7.5 × 5.625 m) and the 10 kV capacitor bank room (7.5 × 3.375 m): the protection, measurement and control, and communication panels share one room, and the capacitor cabinets have a room of their own.
The land for a complete substation also covers the main transformer, incoming and outgoing lines and internal roads, as set by the project design. For the E-House itself, the two-storey layout places 157.5 m² of equipment rooms on 90 m² of ground. ETENZ built the enclosure to the EPC contractor's technical agreement and brand identity and fitted out the auxiliary systems, including lighting and power distribution, HVAC and earthing. More on the project: 35 kV substation E-House in Ninghai.
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The control E-House for a second DC de-icing system is in place at China Southern Power Grid's 500 kV Liping substation. At 11.4 × 5.6 m, the twin-module unit is the largest by volume of the power line de-icing enclosures ETENZ has built for NR Electric, a series that also covers truck-mounted units, fixed-station containers, and filter and valve enclosures.
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