On September 26, 2024, a group of engineers touched down in Dar es Salaam, Tanzania, ready to upgrade the city’s power grid. For years, Dar es Salaam had frequent blackouts—its old insulation parts just couldn’t handle the harsh weather and environment. The team knew they needed something special to fix this, and 33kV composite suspension insulators turned out to be the perfect fit. Let’s walk through how these insulators helped get the project done right.
September 26, 2024: Arriving on Site & Picking the Right Insulator
As soon as the team landed, they ran into two big hurdles. First, Dar es Salaam is on the coast, so it’s always foggy with salt in the air, super humid, and sometimes dusty from nearby factories. Ordinary insulators break down fast here. Second, many work sites are in remote spots—moving heavy gear is a hassle, and workers have to climb high towers, which is risky. The insulators they picked had to be light and easy to put up.
The team tested a few different insulators before settling on 33kV composite suspension ones. They lined up all the options and compared them—and the choice was obvious (check out the table below):
| Insulator Type | Weight | Anti-Pollution Performance | Corrosion Resistance | Installation Difficulty |
| 33kV Composite Suspension Insulator | Light (only 1 out of 5 the weight of porcelain insulators) | Great (water and fog just slide right off) | Strong (handles salt fog and chemicals without breaking) | Easy (light enough to carry up towers and set up fast) |
| Traditional Porcelain Insulator | Heavy | Okay (dust builds up quickly) | Weak (salt fog eats away at it over time) | Hard (needs a bunch of workers to lift and install) |
| Glass Insulator | Medium weight | Good | Medium (snaps easily if dropped) | So-so (not too hard, not too easy) |
The project’s chief engineer put it simply: “Dar es Salaam’s environment is tough, and we don’t have the best construction tools. We need insulators that work here and don’t make our jobs harder. The 33kV composite ones do both—they’ll keep us on track to finish on time.”
October–December 2024: Building the Power Grid & Using the Insulators
From October to December 2024, the team worked nonstop to build the new power grid. They used 33kV composite suspension insulators in all the key spots, and each time, the insulators did exactly what the project needed.
October 2024: Hanging Power Lines (The Most Important Job)
The team put up 33kV overhead power lines, and the insulators did two crucial jobs: hold up the wires and keep the wires from touching the metal towers (which would cause blackouts). Workers put them on three main types of towers:
- Straight-line towers: These keep the wires straight. The insulators hold the wires up and make sure they never touch the towers—if they did, the power would go out.
- Angle towers: These turn the power lines in different directions. The insulators handle the pull of the wires and stay strong, even when the lines bend around corners.
- Tension towers: These span long distances and rivers. The insulators are strong enough to hold the tight wires and keep the lines safe, even in bumpy, hard-to-reach areas.
November 2024: Using Insulators in Tough Environments
Dar es Salaam’s harsh conditions didn’t faze the insulators at all—they worked great in three tough spots:
- Coastal salt fog areas: The insulators are made of silicone rubber, so water and fog just roll off. That stops salt from piling up and causing blackouts.
- Industrial areas near cement plants: The insulators keep dust and chemicals away. Unlike other insulators, they don’t get damaged by the gunk from factories.
- Hot, sunny areas: The insulators don’t wear out or break down in strong sun and high heat. They work steadily, so workers don’t have to replace them often.
December 2024: Fixing Insulators in the Substation
While they built the overhead lines, the team also added insulators to the 33kV substation—that’s the place that controls the whole power grid. They used the insulators for three things:
- Holding and insulating the wires that leave the substation;
- Helping insulate the substation’s main busbars—those are the big wires that carry lots of power;
- Keeping outdoor power equipment safe. This made the substation smaller, so it took up less space.
March 2025: Finishing the Project & Checking Results
After six months of hard work—from September 2024 to March 2025—the team finished the power grid project. They tested the insulators, and the results were awesome. Here’s what they found:
- Faster installation: The insulators are so light that workers put them up 40% faster than the old porcelain ones. That saved 30% on labor costs, too.
- Stable power: For the first three months, the lines had zero problems—no blackouts from pollution or corrosion. The power stayed on 99.8% of the time.
- Less work later: The silicone rubber insulators don’t need regular cleaning. Workers only have to check them 80% less often than old insulators, which saves tons of time and money.
August 2025: Looking Back & Seeing the Value
Five months after the project finished—since March 2025—the team checked the insulators again. They still worked perfectly, even with Dar es Salaam’s harsh weather. The insulators fixed the old problem of frequent blackouts and made the power grid cheaper to take care of.
This project shows why 33kV composite suspension insulators are perfect for medium-voltage power grids—especially in places with tough environments and limited construction tools. They keep the power on, make construction easier, and save money over time. The Tanzania project is a great example of how picking the right tool can solve even big problems.
