When we talk about building renewable energy, we have to understand the difference between what we build and what we actually use. Here is how the math breaks down:

Imagine we install 100 units of wind and solar capacity.

  • The Weather Limit: Because the sun isn’t always shining and the wind isn’t always blowing, those 100 units of capacity only generate about 15 units of actual energy.
  • The Timing & Location Limits: Even those 15 units aren’t always produced at the perfect time or place, so we lose a bit more:
    1. Supply > Demand: Sometimes we produce too much power when nobody needs it (prices drop below zero, so plants are turned off). We lose about 0.5 units.
    2. Grid Congestion: Sometimes the demand is there, but the physical power lines are full and can’t transmit the energy. We lose another 0.5 units.

The Bottom Line: Out of the 15 units of energy that the weather and technology actually allow us to produce, we lose another ~7% (1 out of 15) simply because our grids and markets aren’t flexible enough yet.

The Challenge Ahead

Currently, overall renewables cover about 55% of our energy demand, with solar (PV) and wind making up 45%. To reach a fully decarbonized grid, we essentially need to double the amount of energy we use from these sources.

We could do this in two ways:

  1. Installing new sites (just building more volume).
  2. Improving technology (using better, more efficient tech at the best locations—like taller wind turbines, expanding into steady offshore wind, or using tracking solar panels that physically rotate to follow the sun).

BUT… there is a catch.

Simply scaling up installed capacity will drastically increase the relative waste we face. If we just add more panels, solar will be produced everywhere at the exact same time, leading to:

  • More periods where supply completely outpaces demand.
  • More energy wasted because the grid is too congested to move it.

The Real Solution

If we want to double our renewable energy without doubling our waste, we have to focus on the system, not just the capacity. Hence, we need to:

  • Reduce Grid Congestion (Fix the bottlenecks): We have to upgrade our infrastructure and build new, high-voltage transmission lines to carry power from where it’s generated (like windy coasts) to where it’s consumed (like industrial centers).
  • Better Match Supply and Demand (Fix the timing):
    1. Demand Flexibility: We need to consume energy when it’s abundant. This means smart-charging EVs during peak midday sun, or briefly reducing smart home heating during electricity shortages.
    2. Storage: We must save the excess power for later using large-scale battery parks or by converting it into green hydrogen.

Building capacity is only step one. Building a grid that can actually use it is the real energy transition.