They don't "balance" affordability; they hide the costs via subsidy schemes. The key question for the enviros is how to camouflage the subsidies to make them invisible to the public and avoid accountability for the politicians.
Balancing reliability and emissions reduction? Mainly they will condition people to accept intermittent outages as the new normal.
See #12 for the way California is doing that. The rich pay more for power. The poor get a huge subsidy. Equity, baby!