SIGMA Engineering was established in 1988 as a power quality company. A year after year it was expanding and started its own manufacturing sector to produce stabilizers ( up to 1.5 MVA), Battery chargers ( for 24 VDC up to 220 VDC) and measuring instruments ( digital panel meters) . Rather than introducing its solutions for power quality problems based only on products produced by others well-known multinational manufacturers as GE and ABB, it made its own mix of products : part of it manufactured by others while the second part are products from its own innovation. Whatever was the problem that our customers are facing with their electric power, Sigma Engineering is always beside them to secure that their business will continue without any interruption. Not only it is important to introduce the solution, but more important is to keep it running a year after the other, the matter that Sigma secures by its excellent after sales team. In the meantime, Sigma is integrating all its services inside its facilities of more than 4000 square meters of buildings located in Obour City, 20 Km far from Cairo.