"121 who invests in solar collectors and to a society which has an interest in developing alternative sources of energy. 6 Third, the policy of favoring unhindered private development in an expanding economy is no longer in harmony with the realities of our society. State v. Deetz , 66 Wis. 2d 1 (1974). The need for easy and rapid development is not as great today as it once was, while our perception of the value of sunlight as a source of energy has increased significantly. Courts should not implement obsolete policies that have lost their vigor over the course of the years. The law of private nuisance is better suited to resolve landowners’ disputes about property development in the 1980’s than is a rigid rule which does not recognize a landowner’s interest in access to sunlight. As we said in Ballstadt v. Pagel , 202 Wis. 484, 489 (1930), “What is regarded in law as constituting a nuisance in modern times would no doubt have been tolerated without question in former times.” We read State v. Deetz , 66 Wis. 2d 1 (1974), as an endorsement of the application of common law nuisance to situations involving the conflicting interests of landowners and as rejecting per se exclusions to the nuisance law reasonable use doctrine. In Deetz the court abandoned the rigid common law common enemy rule with respect to surface water and adopted the private nuisance reasonable use rule, namely that the landowner is subject to liability if his or her interference with the flow of surface waters unreasonably 6 State and federal governments are encouraging the use of the sun as a significant source of energy. In this state the legislature has granted tax benefits to encourage the utilization of solar energy. See Ch. 349, 350, Laws of 1979. See also Ch. 354, Laws of 1981 (eff. May 7, 1982) enabling legislation providing for local ordinances guaranteeing access to sunlight. The federal government has also recognized the importance of solar energy and currently encourages its utilization by means of tax benefits, direct subsidies and government loans for solar projects. [citations omitted]"