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Michigan Solar Calculator

Enter your DTE or Consumers Energy bill — get system size, snow-adjusted production at 3.7 PSH, DTE SolarCurrents vs. retail net metering comparison, property tax exemption, and 25-year savings for Detroit, Grand Rapids, Ann Arbor, and the UP.

Michigan solar inputs
$
kW
Michigan solar estimate
20 × 400W panels (8 kW system)
Recommended size for your bill: 10.1 kW
Monthly usage889 kWh/mo
Annual production (3.7 PSH)8,643 kWh/yr
Self-consumed savings (retail rate)$1,011/yr
DTE SolarCurrents export ($0.03/kWh)$91/yr
Total annual savings$1,102/yr
Gross system cost$22,000
Federal ITC (30%)-$6,600
Net cost after ITC$15,400
Property tax exemption (est. 20yr)$5,348
Payback period14.0 yrs
25-year savings$27,550
DTE SolarCurrents exports excess solar at ~$0.03/kWh (avoided cost rate), not retail rate. To maximize savings, size your system to match your annual consumption closely to avoid large exports. Consider a battery to shift solar use to evenings.
Michigan's high DTE/Consumers electricity rates ($0.16-0.18/kWh) make solar more valuable per kWh than lower-rate states, partially compensating for 3.7 PSH. Property tax exemption applies automatically.
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How to Use This Calculator

Select DTE or Consumers Energy and enter your bill

Michigan's two dominant utilities have very different solar programs. DTE Energy customers use the SolarCurrents program, which buys exported solar at the avoided-cost rate (~$0.03/kWh) — much lower than retail. Consumers Energy offers standard retail-rate net metering. This difference significantly affects payback: a DTE customer should size their system to maximize self-consumption and minimize exports, while a Consumers Energy customer benefits from a larger system that exports freely at retail rates.

Consider the snow load toggle

Michigan winters reduce solar production through panel shading from snow accumulation. In the Lower Peninsula, expect 5% annual production loss; in the Upper Peninsula, 10%. Snow typically slides off panels within 1-3 days after a storm due to panel tilt and heating, but prolonged heavy snowfall — common in the UP — can suppress production for weeks. Toggle the snow consideration on for a conservative estimate, especially for Upper Peninsula systems.

Why Michigan solar makes sense despite lower sun

Michigan has 3.7 PSH — below average — but DTE and Consumers rates at $0.16-0.18/kWh are among the highest in the Midwest. Each kWh offset is worth significantly more in Michigan than in low-rate states. The high electricity rate partially compensates for the lower production, and the 30% ITC plus 100% property tax exemption apply regardless of location.

The Formula

Monthly kWh = Monthly bill ÷ Electricity rate Annual production (base) = System kW × 1,000 × 3.7 PSH × 365 × 0.80 Snow adjustment = Base production × (1 − snow loss %) DTE savings = Self-consumed kWh × $0.18 + Exported kWh × $0.03 Consumers savings = All production × Retail rate Gross cost = System kW × 1,000W × $2.75/W ITC = Gross cost × 30% Net cost = Gross cost − ITC Property tax savings = System value × 1.43% × 20 years Payback = Net cost ÷ Annual savings

The DTE vs. Consumers difference is critical. A 6 kW system exporting 40% of production to DTE earns only ~$50/year on exports vs. ~$690 if under retail net metering. Right-sizing a DTE system to your consumption (not oversizing) is the key optimization for Detroit-area homeowners.

Example

Rivera family — Ann Arbor, MI (DTE Energy)

The Rivera family in Ann Arbor pays $115/month to DTE Energy at $0.18/kWh. They're evaluating a 6 kW system sized for their consumption.

Monthly bill$115/mo
UtilityDTE Energy ($0.18/kWh)
System size6 kW (15 panels)
LocationAnn Arbor, MI (3.7 PSH)

Result

Annual production~6,400 kWh/yr
Self-consumed savings~$749/yr
DTE export income~$58/yr
Total annual savings~$807/yr
Gross system cost$16,500
Federal ITC (30%)-$4,950
Payback~14.3 years
25-year savings~$20,175

DTE's low export rate makes it critical to match system size to consumption. This 6 kW system is sized to maximize self-consumption. Under Consumers Energy retail net metering, the same system would pay back in ~11 years — illustrating why utility choice matters significantly in Michigan solar decisions.

FAQ

DTE SolarCurrents is DTE Energy's solar program, which pays homeowners for excess solar exported to the grid at the "avoided cost" rate — approximately $0.03/kWh, versus the retail rate of ~$0.18/kWh. This 6:1 ratio between retail and export rates means exporting solar to DTE is financially inefficient. DTE SolarCurrents customers should size systems to match annual consumption (not exceed it), shift energy use to daytime hours when solar is producing, and consider battery storage to capture excess solar rather than exporting it. The self-consumed portion saves at full retail rate — the key is minimizing exports.
Snow reduces Michigan solar production by 5% annually in the Lower Peninsula and 10% in the Upper Peninsula. The actual mechanism: snow accumulates on panels, blocking sunlight until it melts or slides off. Well-tilted panels (30° or more) shed snow faster than flat installations. Lake-effect snow in western Michigan (Grand Rapids, Muskegon) and the Upper Peninsula creates heavier accumulation. However, December and January are already the lowest production months due to short days, so snow primarily reduces an already-small winter production. Annual impact is modest. Brushing panels after heavy storms is effective but not required.
Yes — Michigan provides a property tax exemption for solar energy systems under PA 135 of 2012 (MCL 211.9i). The exemption applies to "qualified solar energy systems" used primarily for the homeowner's own use. At Michigan's average effective property tax rate of ~1.43%, exempting a $20,000 solar system saves ~$286/year in perpetuity. The exemption applies to both residential and commercial systems meeting the qualified use criteria. File with your local assessor to claim the exemption; it doesn't always apply automatically.
For Consumers Energy customers — yes, with good economics. Retail net metering at $0.16/kWh, 3.7 PSH, and the 30% ITC produces paybacks of 10-13 years on a 25-year system. For DTE customers, the answer is more nuanced. DTE's $0.18/kWh retail rate is the highest in the Midwest, making each self-consumed kWh very valuable. The key is sizing correctly — match the system to your consumption (typically 80-90% offset) and minimize exports. Under this approach, DTE customers see paybacks of 12-15 years, still reasonable for a 25-year investment that then generates $700-1,200/year in savings.
For DTE customers specifically, battery storage is more financially compelling than in most states. Since DTE pays only $0.03/kWh for exports, storing excess daytime solar in a battery and using it in the evening (at avoided retail cost of $0.18/kWh) adds significant value — $0.15/kWh benefit vs. $0.18/kWh without battery, since you avoid exporting at $0.03. A 10 kWh battery paired with a well-sized system can improve DTE customer payback by 2-3 years and reduces exported power. Consumers Energy customers with retail net metering get less financial benefit from batteries (mainly for backup), but may benefit under future net metering rule changes.

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