I saw a park has fitted solar panels and I smiled and thought, oh that's great.
Almost the same as in the game:
TRANSFORMERS
Relatively cheap to build and have a large functional radius, but are a non-renewable source of energy and have a running cost based on the number of items they are powering. Guests are not impressed by seeing transformers and will become unhappy if they meet the eye; place them away from sight to avoid this.
WIND TURBINES
A renewable energy source that’s more efficient in windy, colder climes. They cost more to purchase than a transformer, but incur no running costs. Guests understand the benefit of wind turbines, but they are noisy and so they still incur a small happiness penalty.
SOLAR PANELS
A renewable energy source that's more efficient in warmer, sunny climates. Like Wind Turbines, they cost more to purchase than Transformers but don't have a running cost. Guests understand the benefit of Solar panels so they're neutral to their presence.