Mr. Chair, I'll quickly touch on some of the goals we have.
Around Yellowknife, in the North and South Slave, we have two unconnected hydro grids that we need to connect so we can have greater efficiency, and so we can look at providing energy at a reasonable cost up to the diamond mines. Every year that we can help support extending mine life, it's $250 million a mine. The diamond mines contribute about $2.5 billion a year to GDP.
We need to connect those grids. We need to look at a southern intertie so we can become part of the grid, either in Saskatchewan or in Alberta, so we can have that development and the affordable energy that is absolutely critical to life in the north. It's critical anywhere, but our cost of energy is one of the biggest deterrents we have to development. There's that piece.
If the Central Mackenzie oil plate takes off, we want to be able to work with industry to put the road in from Norman Wells to hook into the highway system down south at Fort Wrigley. We need the capacity. That's about a $250-million project. That transmission line piece is about $700 million.
With an $800-million borrowing limit that is now constrained because we have to include NTPC debt, which is self-financing, for example, for $400 million, it takes up a lot of room. The federal government has worked with us. We've gone from $300 million, to $500 million, to $800 million over the years. We've managed to put in our share of the money for the Inuvik-Tuk highway.
We also are putting in a major fibre optic line all the way from Inuvik down to hook into the southern fibre optic system. Inuvik is going to be one of the premier sites in the world for remote sensing. It's different from non-renewable resources, but it's an incredibly important project.
We're doing all of that because we have the room under the current system, but for those other big projects I just talked about, if we don't get an accommodation, then our development and our ability to implement devolution are going to be severely constrained.