Scott, two things.
There is economic value incorporated in renewable energy industries, it's not just about social values. For instance, calculate the impact of enhanced global warming on changing land use patterns (eg. desertification making land untenable for agriculture), the incidence of major storm/flooding events, or the public health costs of fine particulate pollution (which leads to asthsma, respiratory disease and cancers). These things can be measured in $$$. If coal-fired electricity generators were forced to account for their pollution, the price of coal fired electricity would double (in Australia: coal - about $35-40/MWh, wind/solar/tidal - about $70-80/MWh, hydro is even cheaper but ruins river ecosystems) and suddenly renewable energy would be compe ive. The extra cost would have to be absorbed by the community, and therein lies the sticking point as I'm sure you well know.
Secondly, you are obviously an economist because you view the effects of pollution as "externalities", somehow external to the economic system and thus not the responsibility of those that generate them. Pollution is only "external" to economics because economics is flawed and has not yet been recast to incorporate the reality that pollution is not relative to the viewer, it is not a subjective "value", it is a by-product of the production process and must be viewed as a "cost". Just because it is a public good being affected does not render it suddenly subjective. (This is a major failing of the economic rationalist worldview IMHO.)
Of course, the idea of paying for pollution is not popular with polluters, and they have a lot of money (they don't have to pay for the damage done by their pollution to the community's health, social and environmental welfare) and with it political power, so the situation is unlikely to change, but that doesn't mean that it shouldn't change. Governments subsidise polluters through health and environmental programs to the tune of billions of dollars a year, but no-one ever talks about it.
Why is there not more work being done by academic economists to internalise the cost of "externalities"? Oh, that's right, the world is run by economic rationalist neo-cons...