They still seem to be around. They don't measure power directly - they measure the wheel in your existing power meter. Because Gridspy is an independent power

They still seem to be around. They don't measure power directly - they measure the wheel in your existing power meter. Because Gridspy is an independent power meter, we can measure many individual sub-circuits at a high resolution and at low cost. We don't require any particular hardware to be installed in the house already, access to a breaker box is all you need. Our measurement of sub-circuits using our own technology at low cost and 1 sec update rate makes us completely unique. There is a huge list of power monitoring companies but no-one is doing this, or even claiming that they will do it in the future.