Complex sentence: A solar park's income derives from the sales of electricity to the grid, and so its output is metered in real-time with readings of its energy output provided, typically on a half hourly basis, for balancing and settlement within the electricity market.
Split into simpler sentences: A solar park's income derives from the sales of electricity to the grid. The output therefore has to be metered in real-time with readings of its energy output provided, typically on a half hourly basis, for balancing and settlement within the electricity market.